Questions and Answers for Common Network Faults (I)
1 Can the LAN be interconnected through DDN without a router?
In fact, it is OK, but you cannot use the COM port of the microcomputer. The serial port is for asynchronous communication. You use DDN/DTU to use synchronization signals, so it is not possible. You need to purchase an interface card (supports DDN) and IP protocol, and management software is required.
The DDN line can be synchronous, I have applied for N times; the A/B port of DTU is also synchronous/asynchronously optional, which is set by the network management. In the wide area network, the asynchronous DDN line is connected to the computer serial port through the DTU (generally, the computer serial port supports a maximum asynchronous rate of 115.2K), and then the NULL MODEM of NT is used to connect two NTs using AS.
2 What does Wildcard mean in router?
It is equivalent to netmask inverse operation. Class is mainly used in accesslist. 0 bit is not considered. 1...
3 cisco4500, deleted flash, and the more unlucky thing is that I deleted bootflash. Now the machine can only be in romon> state. I already have an IOS on hand, how to upload it? The 4500 rom monitor does not support tftpdnld, does not support xmodem?
You are the same as me - unlucky. I had this incident a few days ago, but I am 3640. I can tell you my method, but I don’t know if it can be used on 4500.
1. I use a hyper terminal that is win95, put the IOS in the directory of the hyper terminal, and remember the name;
2. Use the hyper terminal through console, and adjust the frequency at both ends of the package to 115200;
3. You should be able to find xmodem or ymodem commands under rommom, generally: xmodem -rc c4500flash parameter should be set to error correction.
4. Send file c4500flash in the hyper terminal; if you are lucky, you will find that it is already being transmitted within 2 minutes.
5. After the transmission is completed, the system will load.
In order to ensure that after the system is transmitted, you need to pay attention to the system in ram and not in flash, so you need to copy the IOS into flash.
4 I used a 2501 AUX port to connect a normal 33. 6MODEM to a 2509, and the result was that PING from 2501 was 100% successful. But when connecting to 2501's LAN PING2509, one of two packets is lost. Can that expert give me some advice!
Repeated routing problem. You can set a static route to 2509 first.
5 I have two LANs that want to connect through a pair of routers and a pair of dedicated line MODEMs. Assuming that the IP of the LAN1 server is 1.1.1.1 and the subnet mask is 255.255.255.0 The IP of the LAN2 server is 1.1.2.1 and the subnet mask is 255.255.255.0 How should I set the Ethernet IP address and subnet mask of the two routers, as well as the IP address and subnet mask of Serial0? I have set it for a long time. Ethernet can be UP, but Serial0 cannot be UP:<
The serial port will only be UP after the physical lines (DDN, PSTN) are connected.
6 The big shrimp will build a telecom-grade VPN, which basically all use CISCO equipment.
According to Cisco's materials, its VPN solution is mainly to use routers of "VPN enabled Router" (1000, 1600, 2500, 4500, 4700) and "VPN optimized Router" (800, 1720, 2600, 3600, 7200, 7500) to form a telecom-grade and dedicated line users and a VPDN for dial-up users. First, the IOS version upgrade and the encryption module upgrade are required. In addition, according to Cisco, there is a corresponding VPN management software, but Beijing Cisco said that this software is also officially Release. Therefore, the manual configuration of Cisco's VPN configuration is now very laborious.
Another simpler method is to use CISCO's wide area network switch plus the MPLS protocol, which can save a lot of configuration time. For specific equipment and configuration methods, you can try to visit CISCO's Beijing room laboratory. The above demonstration environment was just completed the day before yesterday and was hosted by Andy Li of CISCO.
7 A cisco2522 wants to connect to Moden (33.6K) on an asynchronous port and dial up the Internet via phone. Please ask everyone what settings you need to do for the router and the specific settings steps. Thanks!
Configure username and password:
username <username> password <password>
Configuration for synchronization port:
physical-layer async
ip unnumbered ethernet? (your LAN port address)
ip tcp header-compression passive
encapsulation ppp
async mode dedicated
peer default ip address pool dialer-group-1
ppp authentication chap
Configure a dial group (if you like),
interface Dialer1
ip unnumbered (ethernet supra)
encapsulation ppp
dialer-group 1
peer default ip address pool dialer-group-1
ppp authentication chap
IP address pool provided for your dialing users:
ip local pool dialer-group-1 10.1.1.1 10.1.1.9
Set your modem port:
generally:
line 2 8
modem InOut
transport input all
speed 115200
flowcontrol hardware
8 Ask a question. The network structure is as follows:
2501 2501
Computer--Router--DTU---DDN---DTU--Router--Computer
| |
modem---------PSTN---------modem
The question is how to set up dial-up backup in the router? Do you want a dedicated Modem? Does it occupy a telephone line (each Modem needs to occupy a telephone line)?
It is believed that one external line must be occupied to achieve dial-up authentication. As for the backup authentication on the router, it relies on the command radius-server, which does not recognize physical connections. I suggest you use ISDN as a backup. It is a very tragic fact if you have to use modem.
If you use PSTN, you don’t need a dedicated modem. Generally, our company used hayes336 modem. Each modem should have a line, especially when configuring modem dialogue, be careful about the content in chat-script. We have failed many times.
Now use ISDN to back up DDN. For example, there is a BRI module on ROUTER that can be configured directly without MODEM. If you use a telephone line, you will be whispered.
Backup of PSTN is very troublesome! I remember that my 2501 IOS did not support the MODEM AUTOCONFIG command at that time, which made me not able to adjust it for a week. How much pressure did I have to bear from the BOSS!
In addition, some places have telephone lines, which is better if you apply for a telephone line.
The CISCO series routers are authenticated in PSTN by defining user names in both routers:
USERNAME AAA PASSWORD AAA
USERNAME BBB PASSWORD BBB
.... ....
RADIUS-SERVER is only used to verify dial-up users
It is recommended to use ISDN line backup, which is fast!
9 I have a 2511, but no computer's control line to router, does anyone know the connection between the CONSOLE PORT on the 2511 and the COM of the computer?
console------com
1-------------5
2-------------6,8
3-------------3
4,5-----------7
6-------------2
7-------------20
8-------------8
10 A perfect deletion operation made my flash delete the IOS in flash, and I can only enter the rommom state when I turned on the computer. I didn’t find any backup IOS and other systems. How to re-pour the system? I have IOS and configuration on tftp. It is said that I can use the xmodem method, but I don’t know how to implement it.
/warp/public/471/
You can also use the confreg command to set the console port to 115200 and then use the xmodem command to enter copy tftp flash in the ROMMOM state. You can download the IOS on the tftp server.
11 I used the asynchronous port of 2511 to connect 8 MODEMs. After dialing, I was verifying the username and password. I waited for a while and then disconnected.
For dial-up network settings, you need to select the terminal window to appear after dialing, or create a script.
12 If "IP SUBNET-ZERO" is not set on CISCO 2514, the mask of the ethernet interface cannot be set (255.255.255.192). IP address and subnet mask are allocated by mains power. It should be correct. Can it be set without it?
The reason is this:
For example, the network 202.38.64.0 is divided into 4 network segments according to 255.255.255.192, which are 202.38.64.0, 202.38.64.64, 202.38.64.128, and 202.38.64.192 respectively.
However, the subnet address of 202.38.64.0 is the same as 202.38.64.0, and the subnet broadcast geology of 202.38.64.192 is 202.38.64.255, which is the same as the broadcast geology of 202.38.64.0. That is to say, it is difficult to distinguish the network geology of 202.38.64.0/255.255.255.192 and the broadcast geology of 202.38.64.192/255.255.192. Therefore, by default in IOS, the subnets at both ends are not used. If you want to use it, it is
To use commands
ip subnet-zero
13 When PING on the Router address on the Router, a simple PING can appear via ("ping"), but if the source IP (ethernet ip) is added, it will always be turned on and off at a time:!!!!!!!!!!!!!!!!, traceroute peer IP finds that the data packet does not return directly from the peer, but goes back after a loop outside. The result is: When the Ethernet network segment accesses INTERNET, God, how to resolve it?
Regarding Q2, it may be the other party's problem. We once accidentally set up two identical geology on the router and made similar mistakes.
14 Use CISCO 2511 as an access server, dialing is normal, but the user cannot access the external server through the default gateway after accessing?
The Route table should be added in the Cisco 2511 I think.
Add ip unnumbered E 0 on the async interface
lobla plus ip classless.
15 CISCO 2509 failure phenomenon:
After dialing, the dialing terminal window appears, without USERNAME, PASSWORD prompt. Press F7 to continue, and the username verification password is displayed and log in. After going up, it cannot connect to the server.
Can any hero tell me the principles, settings, and precautions about user auditing!
In the asynchronous port configuration, change the async mode dedicated to async mode interactive. After entering, enter the ppp command under router> prompt.
(1) The terminal screen needs to be dialed
(2) Username and password are required
(3) Automatic PPP
username david password xxxxxx
!
interface Async1
ip unnumbered Ethernet0
ip tcp header-compression passive
async default routing
async mode dedicated
peer default ip address 192.1.16.198
!
line 1
login local
modem InOut
modem autoconfigure discovery
autocommand ppp
transport input all
speed 115200
flowcontrol hardware
--
enable
conf terminal
line 1 8
login local
exit
exit
write
16 How to provide multiple dedicated lines for E1 line?
The Channelized E1 (channelized E1) module can be used. The total bandwidth of one port is 2M, which can be divided into 32 time slots. The 0th time slot is used for synchronization, and some access devices can be used for the 16th time slot, so at least 30 64K dedicated lines can be accessed therein, or several time slots can be multiplexed to increase the bandwidth of a Channel Group.
You can connect through multiplexed devices! (However, reusing equipment is more expensive) Give a simple example! You can use the access network device (ACS600) of UT Starcom in the United States to connect! Use its 2M wide area card to connect your E1 (but your E1 must have the Channelized E1 (channelized E1) module G.704 interface 75 ohms or 120 ohms, and then it will be much simpler! ACS600 has a variety of line interface cards (v.35 v.24...) Connect this interface to a high-speed modem and then match the internal parameters of ACS600 (too easy)! Then I don’t need to talk about how to wire from modem! ?
Furthermore, the ACS600 also has the function of connecting to the same device or DDN device! Extend the line you want to connect!
Not to mention DDN when it is burned! (He is also the most expensive) The smallest one is more than 200,000 yuan more expensive than ACS600!
17 How to upgrade IOS?
If you have done it, it will not be difficult.
1. First of all, you need to find a way to download an IOS 11.2 IP PLUS (the 2500 series standard configuration memory is just enough). There are many ways to do this. One is to download TFTP from a router with the same series that already has that version; the other is to purchase; and the other is to have a CCO account that can download any version of IOS you want at will (I believe CISCO does not want CCO users to do this).
2. After downloading, you need to set up a TFTP server. Currently, you can download this type of TFTP Server for Win95/98 online. It is also easy to enable TFTP of a UNIX host online.
3. This is the way to upgrade. (Take the example of upgrading the 2500 series on PC)
·Can confirm whether your memory is enough to complete this upgrade through show flash. Connect the Router's Console to the PC's COM port, open the hyper terminal and enter the router. ·Modify the router E0 address and save it with write (!!!) to ensure that your PC and the router are on the same network, and test their interoperability. ·Execute copy tftp flash and follow the prompts. The router will restart first (so you have to save it), then start Erase and drop the original version (this is the so-called danger. Just imagine that there is a problem with the network at this time, or the downloaded file has an error...), and then start TFTP.
If the upgrade of FLASH fails, it can also be fixed. The router can boot routes through the smallest subset of IOS in the ROM, and then select the ZMODEM protocol through the CONSOLE port to copy the IOS to FLASH, but the speed is very slow. I used this method to repair a 3640 router, and it took nearly two hours to copy a 5M IOS.
18 My cosco 1601 for some reason, after setting the data, I saved it with wr. But after the power is down, it still returns to the unset state, as if it has not been saved, and I am puzzled. Is there any problem with my 1601? Please give me some advice.
1. Check your IOS version. The old version may not be saved in the past.
2. Use show ver (the last line) to see what your current register is. Under normal circumstances, it seems to be 0x2102. If it is something else, you need to modify it.
Here is my sh ver
Cisco Internetwork Operating System Software
IOS ™ 1600 Software (C1600-Y-L), Version 11.2(9)P, RELEASE SOFTWARE
(fc1)
Copyright © 1986-1997 by cisco Systems, Inc.
Compiled Tue 30-Sep-97 18:00 by ccai
Image text-base: 0x0801BBF4, data-base: 0x02005000
ROM: System Bootstrap, Version 11.1(10)AA, EARLY DEPLOYMENT RELEASE SO
FTWARE (fc1)
ROM: 1600 Software (C1600-BOOT-R), Version 11.1(10)AA, EARLY DEPLOYMEN
T RELEASE
SOFTWARE (fc1)
SOFTWARE (fc1)
cisco1600 uptime is 15 hours, 37 minutes
System restarted by power-on
System image file is "flash:c1600-y-l.", booted via flash
cisco 1601 (68360) processor (revision C) with 1536K/512K bytes of mem
ory.
Processor board ID 07084676, with hardware revision 00000000
Bridging software.
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
1 Ethernet/IEEE 802.3 interface(s)
1 serial(sync/async) network interface(s)
System/IO memory with parity disabled
2048K bytes of DRAM onboard
System running from FLASH
8K bytes of non-volatile configuration memory.
4096K bytes of processor board PCMCIA flash (Read ONLY)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Does it mean that data cannot be saved?
Configuration register is 0x142
^^^^^^^
How to save the set data in this version?
You just enter conf reg 0x2102 in global mode and press Enter and it will be OK!
19 Can you specifically talk about how to use SNMP services to monitor traffic?
Go to this address:/~oetiker/webtools/.../mrtg/
Download a copy of MRTG to monitor traffic from any SNMP-enabled devices.
20 How to configure x.25 dedicated line users?
Encapsulate the X25 protocol on the SERIAL X port connected to X25, specify its X25 network address, and specify its
routing.
ip address 100.0.0.1 255.255.255.128 Define IP address
encapsulation x25 encapsulation x25
x25 address 123456 Define x25 address
x25 htc 16
x25 default pad
x25 idle 5
x25 map ip 100.0.0.2 123457 Corresponding to the x25 address of the opponent to the ip address
The same configuration is also made on the peer router
21 2500 series ROUTER, when connected through the telecommunications office, how to configure it to follow the DDN clock?
The default is the external clock. Just select the DTE cable.
22 How to keep the original configuration and upgrade the IOS version of 2511
Keep the original configuration and upgrade the IOS version of 2511
copy tftp flash
2511 will reload automaticly.
The setting will be reapply in new IOS automaticly.
Copy tftp flash
OS will ask you the tftp server ip address.
OS will ask you the new OS file name in tftp server.
OS will ask you the new OS file name in router.
OS will ask you confirm the overwrite the new OS.
When you do the upgrade. Be aware if you memory can support new OS.
Good luck.
The steps are:
en
Enter your password
copy startup tftp (Open the tftp application first)
Knock y,y
You can back up the original configuration.
If you need to restore, copy tftp startup
Note: When upgrading IOS, the original configuration will not be CLEAR
23 Can traffic on a special line be monitored?
Install SNMP agent software on the network management workstation, such as: HP Openview, or search for some freeware online
The relevant MIB variables of cisco are:
ifInOctets { SNMP::43.6.1.2.1.2.2.1.10 }
ifOutOctets { SNMP::43.6.1.2.1.2.2.1.16 }
This can be obtained through snmpget.
24 My cisco 2509 has several ports used to dial in to the company's internal network, and several ports are idle. I want to configure dial out on demand to provide internet sharing for the internal bureau network. Is it possible?
Dialing in GROUP ASYC 1 Dialing out GROUP ASYC 2 OR ASYC 5.6.7 can be configured in different ways.
Configure multiple dialer profiles. Set different properties according to the requirements.
I configured it, and the result was that after the router dials on the Internet as needed, users within the LAN only need to specify that Gateway is the router. NAT is required, and IOS needs to be upgraded to IP/Firewall or IP Plus.
25 How to configure cisco2509 to ACCESSSERVE?
I would like to ask the router expert, I want to set up a router on the LAN to unlock the number 163 through the dedicated line. You can already hear the sound of pulling out modem by the router. You can see "success connect" from the super terminal, but you will kick it out after a while and you cannot connect to 163. Please give me advice! How to set it up?
You can use
debug chat
debug async
debug ppp
debug dialer
Come to debug.
If you are a router on telnet, you should use it
terminal moniter
Output debug information to the screen
Use it after debugging
no debug chat
no debug async
....
Debugging information is prohibited.
26 Can anyone explain the working principle and related applications of the Data Link Switch protocol.
Data Link Switch mainly switches based on fields in frames (Frame), such as address bits, transmission control bits, etc. The relevant protocols are roughly divided into two categories: 1 is related to WAN, such as Frame Relay, LAPB of X.25, LCP in PPP, etc., and each has its own characteristics. 2 is LAN, mostly IEEE 802 series standards.
DLSw is a multi-protocol solution for CISOC, which is generally used to run IP and SDLC data on IP.
27 What command can be used to correspond to CISCO's IP with TOS BYTE corresponding to COS BYTE on 802.1q/p?
TOS BYTE in IP is a field in the IP packet that identifies how this packet is processed, with 32 Bits. COS is the priority of the data link layer to identify the FRAME, with values ranging from 0 (low) to 7 (high) and only exist in the TAG in the Frame added by ISL and 802.1Q. They belong to different levels and cannot be used to correspond to them. COS can be used in the switch to correspond to the destination MAC address or VLAN number. The command is:
set qos mac-cos dest_MAC_addr VLAN cos_value
28 Rescue: Two 2500s are connected with 64K DDN (V35). How to configure them? ? ? How do I configure the IPs on both ends (either with ETHERNET 0 , SERIAL 0 )?
CISCO 1 CISCO 2
e0 s0 ~~~~~~~~~~~~~~~~~~~~~~~ s0 e0
DDN
V V V V
ip ? ip ? ip ? ip ?
Please give me some advice!!!
cisco1:
# interface s0
ip address 200.0.0.1 255.255.255.252
encapsulation hdlc
clockrate 64000
bandwidth 64000
int e0
no shutdown
ip address 200.0.0.2 255.255.255.0
media_type **
....
for address,so do in 2
and no clockrate in cisco2
29 Can CISCO 2509 control the site bandwidth? Which command to implement it?
As mentioned earlier, the following is what I actually used (the external port is S0):
Use the following command:
interface serial 0
custom-queue-list 1 ; use the queue defined below 1
!
access-list 10 permit 202.38.64.0 0.0.31.255; defines the IP range
access-list 11 permit 202.127.200.0 0.0.7.255
access-list 12 permit 210.72.12.0 0.0.1.255
queue-list 1 protocol ip 0 list 10; subqueue 0 of queue 1 satisfies access-list 1
0 package
queue-list 1 protocol ip 1 list 11; subqueue 0 of queue 2 satisfies access-list 1
2 packs
queue-list 1 protocol ip 2 list 12; subqueue 0 of queue 3 satisfies access-list 1
3 packages
queue-list 1 default 16; other packages
queue-list 1 queue 0 byte-count 1500
queue-list 1 queue 1 byte-count 1500
queue-list 1 queue 2 byte-count 1500
queue-list 1 queue 16 byte-count 500
The above idea is to configure custom-queue, and the router will transfer the packets to be sent according to each subqueue.
Define the packets sent by IP into different subqueues, such as 202.38.64.0-202.38.95.255 into the subqueues
Column 10, ..
When the router sends data, each subqueue in the queue is processed in turn until the subqueue is empty.
Or bytes of data have been sent.
According to the above configuration,
202.38.64.0-202.38.95.255 accounts for 3/10 of the bandwidth,
202.127.200.0-202.127.207.255 accounts for 3/10 of the bandwidth,
210.72.12.0-210.72.13.255 accounts for 3/10 bandwidth,
The others account for 1/10 of the bandwidth.
30 Recently I am doing a dial-up backup solution. I have been using static routing before. Now I want to use RIP dynamic routing protocol. I don’t know how to configure it?
The Ethernet networks connected to the two routers are 192.168.0.0/32, 192.168.3.0/32, and the DDN addresses are 192.168.1.5, 192.168.1.6, and the IP addresses of the backup telephone line are 192.168.2.5, and 192.168.2.6.
On r1:
router rip
network 192.168.0.0
network 192.168.1.0
network 192.168.2.0
On r2
router rip
network 192.168.3.0
network 192.168.1.0
network 192.168.2.0
Static routes such as ip route are used to activate dialing. Rip can only be after dialing is connected.
Transfer routing information on the dial-up link. First, please check dialing on the IP of the PING peer on the router.
Whether the mechanism is reliable.
31 Can I restrict the sites that users visit on the router, for example, to prevent users from accessing a certain site?
You can restrict the user on the port based on the source address or destination address. To restrict the destination address, you can do ex tend access-list.
32 I first came into contact with CISCO things. I was not good at English. After reading the manual for a long time, I finally got the IOS in and then used CMAKER to configure it. I connected CISCO2509 to the bureau network, and then wanted it to access the server, and configured ASYNC1, username and password. Connect the MODEM to ASYNC1. But I didn't respond no matter how I dialed. When I dialed on a regular phone, I felt like no one answered. I want to know what else I should do? Do I need to install RAS on the NT server in the local network? Is there any possibility of hardware electrical failure? Or what other configuration is needed?
Another question is that using CMAKER can create users for CISCO2509, and using ACS can also create users. What is the difference between the two?
This is because you do not set MODEM to auto-answer (AA, Auto Answer). MODEM must be set to AA mode to answer your dial-in. One of the appeal methods can be set:
1. In CISCO
config term
line 1 8
modem inout ; so that the following MODEM operation is used, generally this line Cmaker has been written
exit
exit
On a UNIX machine (you can use other machines, as long as you can connect to port 2001), telnet your_route_ip 2001; 2001 corresponds to asynchronous port 1; MODEM, enter AT to enter at this time, and there should be a response "OK". If there is no response, find the reason.
If there is an "OK" reaction, enter
ATs0=1&W ; The command to initialize MODEM is followed by AT, which can be accessed in detail.
; Search, there are detailed
Then exit the telnet program, and you can try dialing at this time, and you should be able to answer.
2. Connect a terminal to the MODEM (or connect the computer to the computer),
Set the initialization string for MODEM in the simulation terminal program.
The above setting is that if the first MODEM is working normally, all MODEMs must be set up. The initialization string is more critical, and it can often respond but cannot work normally. For example, it is garbled when connected. At this time, you need to search with the MODEM you use as the keyword. You can often find a more "correct" initialization string and just use it.
Another problem is that using CMAKER can create users for CISCO2509.
The user created by Cmaker is actually line by line in the configuration file
username aaaa aaa_password
username bbbb bbb_password
There is no need to install RAS on the NT server in the local network.
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Questions and Answers for Common Network Errors (II)
1 How to view the CPU utilization rate of ROUTER? What is the general range that is normal?
show proc cpu generally should not exceed 80%.
The Cisco routers are not overutilized. (5-minute CPU utilization under 75%)
2 Ask for help! CISCO ROUTER How to use PC (WIN95) to transfer files with TFTP.
Install a TFTP software on win95.
When you need to type a TFTP address on the cisco side, just write your win95 address.
It is better not to use CISCO's own tftp, it is very easy to crash. Even CISCO engineers don't like to use it. Many of them use Walusoft's tftp pro, which is much more stable.
3 Intranet 192.168.; The router WAN port IP address is 202.44.0.148; I will use 192.168.200.10.-192.168.200.254 to point to 202.44.0.148; within 192.168.200.10 as the server, they will use bidirectional NAT to bind their respective real addresses. In the above situation, I am easy to use a 3COM router, mainly 192.168.200.10-192.168.200.254. How to configure the router using CISCO?
On a CISCO router, you can use the Translate Inside Source Addresses method to bind your server to a true address. For addresses of 10-254, you can use the Overloading Inside Global address (set an IP POOL).
4 Can multiple TRUNKs be set on the same CISCO switch?
Of course it's OK
5 How to synchronize time between router and switch?
Start NTP
6 How many meters can the furthest connection between twisted pair and coaxial cable?
10BaseT and 100BaseT (Star) 100 from hub to station
10Base5 (Bus) 500
10Base2 (Bus) 185
Adding relay can be extended, four network segments and three repeaters (active)
Therefore, thin cable: 4*185; thick cable: 4*500; twisted cable: 4*100 (minimum)
I remember it seems to be 5*185/500/100
7 The number of collision and deferreds of my cisco2511's e0 port increased rapidly. In less than a day, collision and deferreds increased to 7300 and 2300 respectively. During this day, my lan PC is sometimes slow to access the Internet. I wonder if these collision and deferreds are normal, and whether it has a time period impact on lan's Internet speed? In addition, the carri and colli of server network cards on LAN have also increased significantly. I wonder what this has to do with? Please give me some advice. Thanks.
It is estimated that there are many microcomputers and data transmission is frequent, resulting in increased conflicts
This will happen when there are more PCs connected to the E0 port, which means that the utilization rate is high and normal!
8 Who has the example of Cisco1603 passing ISDN on 163?
isdn switch-type is the type of isdn switch, and in Guangdong it should be primary-net5.
Spid is the system configuration id number, which is a must-have for the switch. I think 1600 is definitely something you need to wear, right?
Have you equipped your bri 0 port with PPP? It may be because your isdn cannot be connected.
This is a configuration file for 163 on 2503 dialing ISDN. The location is Harbin
User Access Verification
Password:
Router>en
Password:
Router#sh runn
Building configuration...
Current configuration:
!
version 11.3
no service password-encryption
!
hostname Router
!
enable password *******
!
ip nat inside source list 1 interface Dialer0 overload
isdn switch-type basic-net3
!
!
interface Ethernet0
ip address 192.168.1.34 255.255.255.0 secondary
ip address *.*.*.* 255.255.255.224
ip access-group 102 in
ip nat inside
no cdp enable
!
interface Serial0
ip address *.*.*.* 255.255.255.252
ip access-group 2 in
ip nat outside
no cdp enable
!
interface Serial1
no ip address
shutdown
!
interface BRI0
no ip address
encapsulation ppp
dialer pool-member 1
!
interface Dialer0
ip address negotiated
ip nat outside
encapsulation ppp
bandwidth 64
no keepalive
dialer remote-name
dialer string 163 class 163map
dialer load-threshold 64 either
dialer pool 1
dialer-group 1
ppp authentication pap callin
ppp pap sent-username pmodernjd password 7 00131A08560B5B56
ppp multilink
!
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
!
!
map-class dialer 163map
dialer idle-timeout 60
dialer fast-idle 30
dialer enable-timeout 1
no logging buffered
no logging trap
access-list 1 permit 192.168.1.0 0.0.0.255
access-list 2 deny 192.168.1.0 0.0.0.255
access-list 2 permit any
access-list 101 deny ip any host 151.196.194.123
access-list 101 deny ip any host 209.1.144.192
access-list 101 permit ip any any
access-list 102 deny udp host 192.168.1.103 host 202.97.224.68
access-list 102 permit ip any any
access-list 103 deny ip any 0.0.0.255 255.255.255.0
access-list 103 permit ip any any
dialer-list 1 protocol ip list 103
!
line con 0
exec-timeout 0 0
line aux 0
line vty 0 4
access-class 1 in
password cw1990
login
!
end
Router#sh start
Using 1508 out of 32762 bytes
!
version 11.3
no service password-encryption
!
hostname Router
!
enable password modernjd
!
ip nat inside source list 1 interface BRI0 overload
isdn switch-type basic-net3
!
!
interface Ethernet0
ip address 192.168.1.34 255.255.255.0 secondary
ip address 202.97.251.34 255.255.255.224
ip access-group 102 in
ip nat inside
no cdp enable
!
interface Serial0
ip address 202.97.240.214 255.255.255.252
ip access-group 2 in
ip nat outside
no cdp enable
!
interface Serial1
no ip address
shutdown
!
interface BRI0
ip address negotiated
ip nat outside
encapsulation ppp
no keepalive
dialer idle-timeout 60
dialer fast-idle 30
dialer enable-timeout 1
dialer string 163
dialer load-threshold 128 either
dialer-group 1
no cdp enable
ppp authentication pap callin
ppp pap sent-username pmodernjd password 7 071828421C594955
ppp multilink
!
ip classless
ip route 0.0.0.0 0.0.0.0 BRI0
!
no logging buffered
no logging trap
no logging trap
access-list 1 permit 192.168.1.0 0.0.0.255
access-list 2 deny 192.168.1.0 0.0.0.255
access-list 2 permit any
access-list 101 deny ip any host 151.196.194.123
access-list 101 deny ip any host 209.1.144.192
access-list 101 permit ip any any
access-list 102 deny udp host 192.168.1.103 host 202.97.224.68
access-list 102 permit ip any any
access-list 103 deny ip any 0.0.0.255 255.255.255.0
access-list 103 permit ip any any
dialer-list 1 protocol ip list 103
!
line con 0
exec-timeout 0 0
line aux 0
line vty 0 4
access-class 1 in
password *******
login
!
end
Router#
9 How to implement the bridge function on a dial line (i.e., support NETBIOS broadcasting)?
Add an inscription between server name and IP in the client's LMHOSTS file or build a WINS server on the RAS side. In the client, WINS points to the WINS server in the client
10 Model: A-terminal---------------------------------------------------------------------------------------------------------------------
XXXX 172.1.1.1 YYYY
Purpose: No machine other than xxxx, the B-end network can access the B-end network except yyyy, the B-end network can access the A-end. How to set it up?
Just set the access list.
The access-list number of 48-bits MAC address access list is 700-799
There is also an extend MAC address access list that is 1100-1199 but has not been used
11 There is a company that wants to surf the Internet through 2509. IP pool uses internal address. How to convert it into a legal IP address? Is this solution feasible? Or use an NT machine to build a DHCP server and dynamically allocate the IP address. How? Is it feasible?
no problem. Configure DDR on the 2509, and then set up an IP POOL using the NAT function. Use private addresses in the intranet. No need to use DHCP.
12 How to connect LANs in three places (more than 1,000 kilometers away from each place) together through DDN, be sure to make the LANs in each place belong to the same network segment (because to run a certain software, the premise for this software is that the workstation must belong to the same network). What network equipment is needed, etc.
Router bridge
13 What is the RJ-21 Telco interface and what is it used for?
Telco interface is Rj11
voice interface have :fxo,fxs,e&m
fxs is connect tel,fxo & e&m is connect PBX
14 CISCO 2511 configuration issues:
The OSPF protocol is used. The configuration is as follows:
interface Ethernet0
ip address 10.88.132.5 255.255.252.0
!
interface Async1
ip unnumbered Ethernet0
ip tcp header-compression passive
encapsulation ppp
bandwidth 36
keepalive 10
async mode interactive
peer default ip address 10.88.167.1
no fair-queue
no cdp enable
!
(slightly)
.
!
router ospf 1
network 10.88.167.1 0.0.0.0 area 10.88.132.1
!
line 1
script dialer cisco-default
modem InOut
autocommand ppp
transport input all
rxspeed 57600
txspeed 57600
flowcontrol hardware
!
.
.
After remote dialing, you can PING 10.88.132.5, but you cannot PING 1.88.132.5. How to solve it?
add a route: ip route 0.0.0.0 0.0.0.0 e0
Add e0 in ospf
router ospf 1
network 10.88.167.1 0.0.0.0 area 10.88.132.1
network 10.88.132.5 0.0.3.255 a 1
What are you doing with OSPF? Do other routers (connected to E0 port) use OSPF?
Add two:
ip classless
ip route 0.0.0.0 0.0.0.0 e0
It's definitely OK.
15 Please tell me about the command to delete the configuration of the 2924 switch?
erase startup-config
16 version 12.0
service timestamps debug datetime
service timestamps log uptime
May I ask all the heroes, what does the configuration above mean? What is timestamps?
This is about the configuration of timestamps, the purpose is to make the logs have the time when they occur, which is convenient for troubleshooting.
17 How to use custom queue to limit the bandwidth of a certain kind of traffic? I want to limit the traffic accessed by http to a maximum of 6.4Kb per second on a 64Kb interface, and leave the other bandwidth to the bridge (bridge priority). How to configure it? The book is a bit vague, I hope you can get help from everyone
If you want to limit http traffic to 10% and leave the other 90% bandwidth to the bridge, you can use Queuing.
But if you want to limit http traffic to 6.4k and leave the other 57.6k bandwidth to the bridge, you need to use Traffic Shaping.
queue-list 1 protocol ip 1 tcp 80
queue-list 1 default 2
queue-list 1 queue 2 byte-count 13500
!
interface serial 0
custom-queue-list 1
Note:
1. The tcp port of http is 80
2. The default bye-count is 1500, so 1500x9=13500
18 Please tell me about the specific working principle of the "WELL-KNOWN LECS ATM Address" of ATM LECS?
The LEC knows the ATM address of the LECS in 1 of 3
ways
1. The LECS address can be hard- coded in the LEC
2. ILMI
When the LEC attaches to the ATM Switch, it sets up an ILMI VCC to
exchange management information with the switch.
If the switch is configured (hard coded) with 1 or more LECS addresses
, the LEC can
obtain these addresses when it ILMIs
3. LECS Well Known Address (WKA)
When a LECS connects to the switch, it registers the LECS WKA
Using the WKA in an environment with multiple LECS can be
non- deterministic (you may not be able to determine which LECS will b
e used -
depending on the configuration of the switches)
(4.) The LEC can also connect to the LECS using the well- known
PVC
This is rarely used
The address of the ATM LECS defined in ATM FORUM is 47.**.**........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
19 Modem remotely dials into CISCO 2610, how can I log in to NT DOMAIN???
Start the WINS service on NT, and then configure the IP address of the server in the IP/WINS on the server and client
20 Make a plan for the campus network of No. 1 Middle School. The L3 switch (www, email and other servers are connected to it) is connected to CISCO3600 through 256KDDN to CHINANET and CERNET, and the library's WEB SERVER is connected to CISCO2511, and the 2511 is also connected to INTERNET through 128KDDN. At the same time, all public resources of the library can also be accessed through 3600 (the library office and the entire campus network are in a small VLAN). Boundary routing between 3600 and 2511 is for traffic control and load balancing. How to set up the route between them? I hope all experts will give me advice!
first,how you connect you router to chinanet and cernet,by static default route or dynamic route??if by dynamic route,you should cooperate with the router of telecom; if by static route,you need only configure two default route,recommend for this second,you should need to decide which route protocol to run between the cisco 3600 and cisco 2501,such as ibgp third,decide the as number you use,such as 65444(65412-65535 is private as number) fouth,configure you router:
routeA's address:10.0.0.2, routeB's address:10.0.0.1
routeA(config)#router bgp 65444
routeA(config-router)#network *.*.*.* ;your network number connected to router A
routeA(config-router)#neighbor 10.0.0.1 remote-as 65444
routeB(config)#router bgp 65444
routeB(config-router)#network *.*.*.* ;your network number connected to router b
routeB(config-router)#neighbor 10.0.0.2 remote-as 65444
21 Please tell me how to close the TCP/UDP port on the router?
Use extended acl
22 I want to maintain remotely. Does anyone have configured AUX ports?
Client
hostname client
!
enable password cisco
!
username server password 0 cisco
!
chat-script dialup ABORT ERROR ABORT BUSY "" "ATDT14" TIMEOUT 30 CONNE
CT
!
interface Async1
ip address 10.5.1.2 255.255.255.0
encapsulation ppp
dialer in-band
dialer map ip 10.5.1.1 name server modem-script dialup 14
dialer-group 1
async default routing
async dynamic routing
async mode dedicated
priority-group 1
!
ip classless
ip route 0.0.0.0 0.0.0.0 Async1
no ip http server
!
dialer-list 1 protocol ip permit
!
line con 0
line aux 0
script dialer dialup
modem InOut
speed 115200
line vty 0 4
password cisco
login
!
end
-------------
server
hostname server
!
enable secret 5 $1$N/2B$NziQD/0HIqiTdHJGcUn2j1
enable password cisco
!
username router password 0 cisco
memory-size iomem 15
ip subnet-zero
!
!
interface Async1
ip address 10.5.1.1 255.255.255.0
encapsulation ppp
dialer in-band
dialer map ip 10.5.1.2 name qinzhou broadcast
async default routing
async dynamic routing
async mode dedicated
priority-group 1
!
ip classless
ip route 0.0.0.0 0.0.0.0 Async1
!
line con 0
transport input none
line aux 0
modem InOut
transport input all
speed 115200
line vty 0 4
password cisco
login
!
end
23 I now want to know how to configure 2B of CISCO ISDN and how to configure 1B? ? ?
Add $p4 to the additional settings to get 2B, add $p3 to get 1B
interface bri0
isdn spid1 12347897433412 3874834
isdn spid2 12347897433412 3874834
Reinitialize the BRI port after matching
24 I have equipped the ppp on async17 as follows:
interface Async17
ip address 192.169.2.1 255.255.255.252
no ip directed-broadcast
encapsulation ppp
dialer in-band
dialer map ip 192.169.2.2 name down broadcast
dialer-group 1
ppp authentication chap
Why can't PPP run? Tip this line may not use PPP. Please point out the expert
join in
autoselect ppp(LINE configuration)
ASYNC configuration is added:
async dynamic address
async dynamic routing
async mode interactive
ip unnumbered Ethernet0
ip tcp header-compression passive
25 I set the following command in CISCO 2511:
ip domain-name
ip name-server 10.10.10.20
async-bootp nbns-server 10.10.10.20
async-bootp dns-server 10.10.10.20
It turns out that the domain name resolution cannot be achieved after dialing. But I have tried that on 2511 it is possible to PING the name. May I ask why this is?
async-bootp dns-server
26 The PC serial port is configured with 9600, 8N1, and automatic protocol detection, but it cannot connect to ROUTER; I want to log in remotely through TELNET, but because ROUTER does not have a password, I can't connect to it. I don't know who has a good trick.
the cable,it isn't a normal network UTP.
the aux port,it can be use like console sometimes
You need cross cable,PLs chk
It should be roll over, 1-8 reverse line
Also check whether the COM port of the PC is good
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Article entry: csh Editor in charge: csh
Q&A on common network failures (III)
1 What are the requirements and significance of defining RING-GROUP?
RING-GROUP is what defines Virtual Ring. Because DLSW+ terminates RIF on the Local Router, the WAN part is defined as a virtual ring.
2 What are the requirements for GROUP settings when defining DLSW+ LOCAL PEER?
When defining LOCAL PEER, there are no requirements for the GROUP setting.
Suppose Router A connects RING 11 and Router B connects RING 10, and they are connected through a WAN
(There may be N routers in the middle),
Router A:
source-bridge ring-group 15
dlsw local-peer peer-id 5.0.0.1
dlsw remote-peer 0 tcp 10.0.0.1
!
interface tokenring 0
ip address 5.0.0.1 255.255.0.0
ring speed 16
source-bridge 11 1 15
source-bridge spanning
Router B:
source-bridge ring-group 15
dlsw local-peer peer-id 10.0.0.1
dlsw remote-peer 0 tcp 5.0.0.1
!
interface tokenring 0
ip address 10.0.0.1 255.255.0.0
ring speed 16
source-bridge 10 1 15
source-bridge spanning
3 What is the difference between DDN and FR?
DDN is transparent and can run various protocols. FR is encapsulated on the basis of DDN.
DDN is the standard of the physical layer.
FR is a link layer protocol.
DDN only supports point-to-point,
FR also supports point-to-multipoint,
DDN is a physical layer protocol, and DDN switches use circuit switching.
FR includes the physical layer and the data link layer, and FR switches use virtual circuit switching.
DDN switches and FR switches are different devices.
However, when users usually use FR, the user end to the FR switch uses a DDN line connection.
4 I heard that I can run VOICE on DDN, so how is the effect? For example, delay, jitter, QoS, cost, etc., which one is better than running on ATMs?
DDN is the standard of the physical layer, and of course it can be done.
Yes, Cisco's 26 and 36 series support, but the bandwidth is a little wider, preferably 128K upwards.
Regarding QOS, it would be really strange if TCP/IP is better than ATM.
5 How to make OSPF, EIGRP, and RIP forward static routes?
redistribute
For example:
ospf 100
network 10.10.10.0 0.0.0.255
network 10.10.20.0 0.0.0.255
redi sta subnet
redi connect subnet
6 98 How to log in to the NT SERVER on the other side through a dedicated network?
If it is not in the LAN, NT installation and configuration are installed with VPN Server, and Win98 comes with VPN Client dialer.
7 What are the differences and specific usages of digital modem and analog modem?
Data modem, simulation modem
Data modem is a data signal (but not a data signal that can be used by computers, for example
The data signal extracted from analog signals on telecommunications is modulated and demodulated into computers
Data signal used)
Analog modem is a signal that is modulated and demodulated to a computer-recognizable
8 What modules can be equipped with cisco2610?
NM-16A 16 port Asynchronous Module
NM-32A 32 port Asynchronous Module
NM-4A/S 4-Port Async/Sync Serial Network Module
NM-4B-S/T 4-Port ISDN-BRI Network Module
NM-4B-U 4-Port ISDN-BRI with NT-1 Network Module
NM-8A/S 8-Port Async/Sync Serial Network Module
NM-8B-S/T 8-Port ISDN-BRI Network Module
NM-8B-U 8-Port ISDN-BRI with NT-1 Network Module
NM-1CT1 1-Port Channelized T1/ISDN-PRI Network Module
NM-1CT1-CSU 1-Port Channelized T1/ISDN-PRI with CSU Network Module
NM-2CT1 2-Port Channelized T1/ISDN-PRI Network Module
NM-2CT1-CSU 2-Port Channelized T1/ISDN-PRI with CSU Network Module
NM-1CE1B 1-Port Channelized E1/ISDN-PRI Balanced Network Module
NM-1CE1U 1-Port Channelized E1/ISDN-PRI Unbalanced Network Module
NM-2CE1B 2-Port Channelized E1/ISDN-PRI Balanced Network Module
NM-2CE1U 2-Port Channelized E1/ISDN-PRI Unbalanced Network Module
NM-4E 4-Port Ethernet Network Module
NM-4E1-IMA 4-port E1 ATM Network Module with IMA
NM-4T1-IMA 4-port T1 ATM Network Module with IMA
NM-1E 1-Port Ethernet Network Module
NM-1ATM-25 One port ATM 25Mbps network module
NM-8AM 8Port Analog Modem Network Module
NM-8E1-IMA 8-port E1 ATM Network Module with IMA
NM-8T1-IMA 8-port T1 ATM Network Module with IMA
NM-16AM 16 Port Analog Modem Network Module
NM-HDV-1T1-24 Single-Port 24 Channel T1 Voice/Fax Network Module
NM-HDV-1T1-24E Single-Port 24 Enhanced Channel T1 Voice/Fax Network Mo
dule
NM-HDV-2T1-48 Dual-Port 48 Channel T1 Voice/Fax Network Module
NM-1V One-slot Voice/fax Network Module
NM-2V Two-Slot Voice/fax Network Module
VIC-2FXS Two-port Voice Interface Card - FXS
VIC-2FXO Two-port Voice Interface Card - FXO
VIC-2E/M Two-port Voice Interface Card - E&M
VIC-2FXO-EU Two-port Voice Interface Card - FXO (for Europe)
VIC-2BRI-S/T-TE Two-port Voice Interface Card - BRI (Terminal)
VWIC-1MFT-E1 1-Port RJ-48 Multiflex Trunk - E1
VWIC-2MFT-E1-DI 2-Port RJ-48 Multiflex Trunk - E1 With Drop and Insert
VWIC-1MFT-T1 1-Port RJ-48 Multiflex Trunk - T1
VWIC-2MFT-T1-DI 2-Port RJ-48 Multiflex Trunk - T1 With Drop and Insert
VWIC-2MFT-T1 2-Port RJ-48 Multiflex Trunk - T1
WIC-1T 1-Port Serial WAN Interface Card
WIC-1DSU-56K4 1-port 4-WIRE 56/64 KBPS WAN INTERFACE CARD
WIC-1B-S/T 1-Port ISDN WAN Interface Card(dial and leased line)
WIC-1B-U 1-Port ISDN with NT-1 WAN Interface Card(dial and leased lin
WIC-1DSU-T1 1-Port T1/Fractional T1 DSU/CSU WAN Interface Card
WIC-2T 2-Port Serial WAN Interface Card for Cisco 2600
WIC-2A/S 2-Port Async/Sync Serial WAN Interface Card for Cisco 2600
AIM-COMPR2 8 Mbps Compression Adv. Integration Module for Cisco 2600
9 What is the difference between E1 and channeled E1? ?
Channeled e1 can be time-sharing, e1 cannot,
e1 can be connected to serial, channeled cannot
10 Can a router be equipped with several ospf processes? What is the significance?
sure. It is mainly used in one router as an edge router for several OSPF AS. Of course, this kind of use is not recommended, as it will consume a lot of system resources.
Is it used to connect to different AS? But I remember that when switching routes between routers running ospf only requires the same area, not the same process number!
Also: Why does one of the two ospf processes I have is inactive?
That's right, even ABR doesn't have to be equipped with multiple processes. OSPF is different from RIP and EIGRP, and its process number is irrelevant. More matching is equivalent to adding more to the snake
11 Cisco 7000 series routers are connected to the Atm network (can it be through 155M STM1?), what interface is used on the router and how to configure the router?
Cisco 7000 series routers connect to the Atm network through 155M stm1, of course!
It can be directly accessed with the ATM interface.
You can also connect to the ATM edge device through the Ethernet port first and then to the ATM network.
12 channeled E1 and g.703, pcm, v.35, sdh?
g.703 and v35 are some interface protocols used on DDN, and PCM (PULSE CODED MODULATION) seems to be used in a telephone network; SDH is an optical synchronization network.
13 I use PIX 1000 to do FIREWALL and want to configure PIX to make an internal network machine set to 192.168.128.1 to be fully accessible on INTERNET. I set it up like this:
static 202.150.50.1 192.168.128.1
conduit 202.150.50.1 0 tcp 192.168.128.1 255.255.255.255
conduit 202.150.50.1 0 udp 192.168.128.1 255.255.255.255
After I matched it, I can PING on INTERNET 202.150.50.1, but HTTP, FTP, POP3, etc. are inaccessible. Please give me some advice.
Try it:
static -a 202.150.50.1 192.168.128.1 secure
conduit 202.150.50.1 tcp:192.168.128.1/32-0
conduit 202.150.50.1 udp:192.168.128.1/32-0
Principle: From the outside to the inside, the default is DENY unless you specify PERMIT
14 A CISCO3640, IOS12.0, configure NM-8AM module for remote access. There was always no response, so I took it to the seller and got it right away. But when I go to my place, it just won't work. Telephone lines, connectors, module installations, etc. have been ruled out, but it still cannot. Please help.
Nephew cat has very high environmental requirements. For example, if the ground wire is not qualified, it will be difficult to pass.
The ground wire is not connected well, the problem has been solved.
15 I want to use the router to make the MAP function of IP packets, that is, to access the package of a specific site and forward it to another site.
Use NAT
16 CISCO router 2611 performs dialing configuration and backs up the main route. When the main route is interrupted, dialing can automatically start and data is transmitted normally. However, when the main route is normal, the dialing route cannot be automatically disconnected. How to configure it? I currently use a dialer idle-timeout 180 to control idle time and disconnect the wire, but it cannot be automatically disconnected in the above situation. Please give me some advice on how to set it up
It may be a routing problem. When the main route is normal, there may be Traffic passing through the dial line. Results backup load 60 5
60-----Separate link is started when the traffic exceeds 60% of the main link
5----When the traffic is less than 5%, the backup link will be hung up.
Set the correct value as needed
The dialing line is always up.
Is it useful?
backup delay 1 2
1----The time (seconds) for the backup circuit to be automatically activated after the main use is disconnected
2----The time (seconds) for the backup circuit to be automatically disconnected after the main circuit is restored
17 Please tell me how to implement the virtual network on 3640.
Inter-VLAN routing is achieved through 100M ETHERNET PORT packet ISL.
If you implement VPN on the third layer, you can use GRE encapsulation technology to establish VPNs through tunnel on the public network. GRE encapsulation may have low security for data, but it is not a problem to design a perfect VPN solution in combination with IPSEC.
18 Recently, a design was to obtain traffic information at different addresses through the data of Cisco's 72 series edge routers in a regional network control center. The main problem now is how to use a PC to obtain record information from the router's cache, how to extract it? What? How to implement it? How to estimate the extraction time (that is, how many times will the information be obtained once)?
For routers, global configuration:
ip accounting-threshold xxx
ip accounting-list xxxxx xxxxx
...
Specific interface configuration:
ip accounting output-packet etc.
The PC reads the IP ACCOUNTING table on the CISCO router through the SNMP protocol, and real-time billing can be achieved by flexibly setting the acquisition interval.
19 Can a 3COM NBII, 3C3509 be set to set two IP addresses on one port, just like a CISCO router.
On one PORT, define two VITRUL PORTs. Each PORT can just define a different IP ADDR.
20 An unexplainable problem encountered in the Cisco2610 configuration!
Its configuration is as follows: (There are two Ethernet ports)
xxxxx#sh run
Building configuration...
Current configuration:
!
version 11.3
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname xxxxx
!
enable secret 5 xxxxxx
enable password xxxxxx
!
interface Ethernet0/0
ip address 168.192.26.250 255.255.254.0
!
interface Ethernet1/0
ip address 168.192.25.250 255.255.254.0
!
no ip classless
!
dialer-list 1 protocol ip permit
dialer-list 1 protocol ipx permit
!
line con 0
line aux 0
line vty 0 4
password xxxxx
login
!
no scheduler allocate
end
168.192.26.1/255.255.252.0---(note its mask)
E0--168.192.26.250/255.255.254.0
E1--168.192.25.250/255.255.254.0
168.192.24.1/255.255.252.0---(note its mask)
Then 168.192.26.1 does not need to set E0 as the gateway, so you can PING 168.192.24.1
There is no routing protocol configured in CISCO. ? ? ? ? Do you only go to the second floor? ? ? Can't figure it out? ? ? ? ?
This is due to improper settings of your subnet mask. Try to configure the mask with 255.255.255.0.
Your two 1 addresses are set on Windows, right? Microsoft's network seems to ignore Yanma. Now these two addresses are pinged together, but they are actually in the same Ethernet network, so of course they can ping.
21 There is a CISCO 3660, please ask the specific settings of X.25.
Configure X.25
The X.25 configuration is completed as follows:
Function command
Set X.25 mode encapsulation x25 [dte|dce]
Set the maximum virtual circuit number x25 htc max-vc-number
Set X.121 address x25 address x121-address
Create an IP address corresponding to X.121 address x25 map ip ip-address x121-addres [broadcast]
htc----htc is the largest number of virtual circuits, because many X.25 switches build virtual circuits from high to low, and max-vc-number cannot exceed the maximum applied value.
X.25 Example
When X.25 is configured, static routing is usually used to reduce calls caused by routing switching. In one-to-many situation,
Not configured with subinterface in a subnet.
Configuration for Router:
interface serial 0
ip address 131.108.100.1 255.255.255.0
encapsulation x25
x25 address 041673226839
x25 htc 16
x25 map ip 131.108.100.2 041675222222
int s 0.1
ip address 131.108.101.1 255.255.255.0
x25 map ip 131.108.101.2 041674222222
!
ip route 131.108.100.0 255.255.255.0 131.108.100.2
ip route 131.108.101.0 255.255.255.0 131.108.101.2
In addition, other IPs and the like are arranged as usual.
22 There are six VLANs on the switch. Without third layer switching, how can all six VLANs communicate with the server connected to a certain port (IP AND NETBEUI)?
Trunk。
Set the port connected to the server to TRUNK, or set to a member of six VLANs (such as in 2924).
23 What is the difference between BRouter and Router in terms of functionality? How to decide which one to choose on the Internet?
BROUTE has an additional bridge function, which can be used as SWITCH.
24 Before, every time I logged in, the prompt was:
hy7507#
Today I changed the IP address of a port, and the prompt after restarting is:
hy7507(boot)#
And some configurations are gone, how to restore the prompt to:
hy7507#
The router is not loaded into the IOS normally when starting.
25 Is the speed of the console port only 9600bps at most? How to improve?
Different models have different maximum speeds, up to 115200.
However, what do you want to do at such a high speed? (Unless you want to use the CONSOLE port to download IOS)
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Q&A on common network failures (IV)
1 If I download cisco's IOS locally and want to update my IOS for my cisco 2505, I am using the hyperterminal that comes with Windows, connecting com1 on my pc and console of cisco 2505. Now, how should I do it?
It can be completed using the zmodem and xmodem protocols of the hyper terminal
Start the routing, press CTRL + BREAK to enter the ROM shape, copy zmodem flash, and then click the sending of the hyper terminal (of course, the path must be set first)
2 HSSI is very expensive and has only one port, which is not as many ports as high-speed serial port cards. It is indeed very fast, but where to use it?
For example, ATM data interface unit
2 As shown in the figure: How to simulate router b as a switch with frame relay?
router a------router b--------router c
router b（config）：frame-relay switching
router b serial 1(config-if):en frame ;
frame-relay intf-type dce
frame-relay route dlci1 in s2 dlci2
router b serial 2(config-if):en frame ;
frame-relay intf-type dce
frame-relay route dlci2 in s1 dlci1
4 IPX SPX IP TCP connection-oriented
SPX TCP
5 How many E1 interfaces does AS5300 support?
8
6 I applied for a 128K DDN for my local Cisco 2505, and also applied for a local call line as a backup. I loaded the ADSL modem on this local call dedicated line, which makes it the ADSL transmission speed, which is about 2M. The other end of this DDN and the local call dedicated line are connected to the same cisco 3640. Generally, after the main DDN is disconnected, the backup port will automatically start up. However, for me, the speed of the backup port is much higher than that of the main one. However, due to the unstable local call dedicated line, I dare not let it be used as the main one. Then I wonder, can I make these two ports work at the same time and automatically allocate them on network traffic. So, is this OK?
If I match the OPSF protocol, then, since the cost of the two ports is different, can it play the role of automatic distribution of network traffic?
So are there any other protocols that also support automatic distribution of network traffic?
Is static routing also supported?
Furthermore, this will lead to a closed network loop, and what possible serious consequences will this cause? How can I avoid it?
You can't use OSPF,but try to use EIGRP
7 How to determine the SPID number in the ISDN router?
SPID is only valid in North American networks and is not used in China. SPID is only the ISDN communication standard in North America. China continues to use European standards. There is no need to set ROUTER to set SPID.
8 I am now facing a problem. I would like to ask you a question. I am using cisco2511. The client (win98) dials on it and wants to access the server (nt server, which uses the DNS service). After dialing on it, it can ping. To access the server, you must set the login to the domain where the server is located. Login to the network after dialing successfully. It is prompted that you cannot log in to the domain. If you press Confirm, it will be normal for the access in the future. If you do not select the login to the domain, the access to the server will not be successful! Is there any way you can do it?
Cisco2511 dialing user must be a domain user of NT, and no test cannot log in to NT.
9 Initial Configuration of cisco
IP address for this interface: 86.101.3.20
Number of bits in subnet field [0]:16
What does 16 mean?
Class A network is 86.0.0.0, 16 subnet bits; mask is 255.255.255.0
What is the connection between 16 above and the address of this line?
How many host IDs are used as the subnet mask? If you choose 16, it is 255.255.255.0. Because A's mask is 255.0.0.0
The standard mask of Class A address is 255.0.0.0, and here the 16BIT mask represents the number of subnets, that is, -2 to the sixteenth power of 2. Written as mask is 11111111111, that is, 255.255. Then the mask of this subnet is 255.255.255.0
10 Lenovo router, used as an internet dedicated line, and a peer cisco router,
1. Can the WAN port encapsulate HDLC?
2. How to match static routes?
The wide-area port is packaged as PPP, and only products that are both CISCO can be packaged as HDLC.
The static route should be: ip route 0.0.0.0 0.0.0.0 s1 (or S0) or ip route 0.0.0.0 0.0.0.0.0 The wide-area port address of the peer router.
11 Two 4500 routers, one is equipped with a 4T module and the other is equipped with a 2T module, one is connected to the V.35DTE line and the other is connected to the V.35DCE line and the two wires are connected together. The viewing ports are all up, but the protocol is still down. May I ask, what's going on.
I think it's a clock issue.
Configure the clock on the router on the DCE side.
12 Use CISCO router to configure ISDN dial-up Internet access. It used to be quite good, but now there is a problem. When ISDN has only one channel UP, everything works fine. Sometimes when another channel is also UP, when the B1 and B2 channels are connected, PING from the router cannot be used anywhere. The returned message is: Is the sent packet timeout required? Is it unreachable? Adding DEBUG IP ICMP returns the message that the IP packet was prohibited by the dialing server. Is it really inexplicable? ? ? ? Has that expert encountered it? Is it a CISCO router problem or an ISP access problem?
When b1 b2 up, the router is multilink ppp, and the same packet will be disassembled. The issue in isp will resassemble. The problem may be in your router.
Try reconfiguring your router.
13 Which are NBMA networks? Which ones are not?
Frame-Relay is a typical NBMA network.
Ethernet is a typical Broadcast network.
DDN is a typical Point-to-Point network.
ATM can also be considered NBMA.
14 I have 5 vlans on 2924 and want to connect to 5505 through 4 lines. How to configure etherchannels on both sides? I use snmp to configure 2924. After pointing each port to each vlan, press Apply, why after shutting down and restarting, all the configurations are gone. Thank you!
Ciscoworks configuration management modifies configuration by replacing config files, so configuration must be imported into the device.
Is the port on 2924 fastethernet? If not, you can't do etherchannel.
You can make a few TRUNK LOAD BALANCE instead
My 2924M-XL port is fastethernet port, but the standard version is not enterprise. I heard that it does not support trunk, I have set vlan, but I don't know if the ports belonging to different vlans need to allocate IP addresses for different network segments?
The IP address within the same VLAN must be the same network segment. The IPs of different VLANs can be in the same network segment or not, but different VLANs must be routed.
VLAN has nothing to do with IP, but the configuration of the main route should be like this, but it is OK to not match this way. There are multiple IP interfaces in a VLAN and a few more routes are OK.
The question is how should I connect it with 5505 now? Should I also set the same vlan as 2924 on 5505 and set the ports to each vlan (that is, it corresponds to one-to-one on 2924?
It should be possible to do Fast EtherChannel:
Four-Port Fast EtherChannel Configuration Example
This example configuration shows how to configure a four-port Fast Eth
erChannel link between two switches. Figure 6-1 shows two switches con
nected through four 100BaseTX Fast Ethernet ports.
Figure 6-1: Fast EtherChannel Port Bundle Example
Step 1 Make sure that all ports on Switch A and Switch B have the same
port configuration, including VLAN membership, speed, and duplex.
Switch_A> (enable) set vlan 50 1/1-4
VLAN 50 modified.
VLAN 1 modified.
VLAN Mod/Ports
---- -----------------------
50 1/1-4
2/1-2
3/1-3
Switch_A> (enable) set port speed 1/1-4 100
Ports 1/1-4 transmission speed set to 100Mbps.
Switch_A> (enable) set port duplex 1/1-4 full
Ports 1/1-4 set to full-duplex.
Switch_A> (enable)
Switch_B> (enable) set vlan 50 3/1-4
VLAN 50 modified.
VLAN 1 modified.
VLAN Mod/Ports
---- -----------------------
50 3/1-4
Switch_B> (enable) set port speed 3/1-4 100
Ports 3/1-4 transmission speed set to 100Mbps.
Switch_B> (enable) set port duplex 3/1-4 full
Ports 3/1-4 set to full-duplex.
Switch_B> (enable)
Step 2 You can confirm the channeling status of the switches using the
show port channel command.
Switch_A> (enable) show port channel
No ports channelling
Switch_A> (enable)
Switch_B> (enable) show port channel
No ports channelling
Switch_B> (enable)
Step 3 Configure the ports on Switch A to negotiate a Fast EtherChanne
l bundle with the neighboring switch. This example assumes that the ne
ighboring ports on Switch B are in EtherChannel auto mode. The system
logging messages provide information about the formation of the EtherC
hannel bundle.
Switch_A> (enable) set port channel 1/1-4 desirable
Port(s) 1/1-4 channel mode set to desirable.
Switch_A> (enable) %PAGP-5-PORTFROMSTP:Port 1/1 left bridge port 1/1
%PAGP-5-PORTFROMSTP:Port 1/2 left bridge port 1/2
%PAGP-5-PORTFROMSTP:Port 1/3 left bridge port 1/3
%PAGP-5-PORTFROMSTP:Port 1/4 left bridge port 1/4
%PAGP-5-PORTFROMSTP:Port 1/2 left bridge port 1/2
%PAGP-5-PORTFROMSTP:Port 1/3 left bridge port 1/3
%PAGP-5-PORTFROMSTP:Port 1/4 left bridge port 1/4
%PAGP-5-PORTTOSTP:Port 1/1 joined bridge port 1/1-4
%PAGP-5-PORTTOSTP:Port 1/2 joined bridge port 1/1-4
%PAGP-5-PORTTOSTP:Port 1/3 joined bridge port 1/1-4
%PAGP-5-PORTTOSTP:Port 1/4 joined bridge port 1/1-4
Switch_B> (enable) %PAGP-5-PORTFROMSTP:Port 3/1 left bridge port 3/1
%PAGP-5-PORTFROMSTP:Port 3/2 left bridge port 3/2
%PAGP-5-PORTFROMSTP:Port 3/3 left bridge port 3/3
%PAGP-5-PORTFROMSTP:Port 3/4 left bridge port 3/4
%PAGP-5-PORTFROMSTP:Port 3/2 left bridge port 3/1-4
%PAGP-5-PORTFROMSTP:Port 3/3 left bridge port 3/1-4
%PAGP-5-PORTFROMSTP:Port 3/4 left bridge port 3/1-4
%PAGP-5-PORTTOSTP:Port 3/1 joined bridge port 3/1-4
%PAGP-5-PORTTOSTP:Port 3/2 joined bridge port 3/1-4
%PAGP-5-PORTTOSTP:Port 3/3 joined bridge port 3/1-4
%PAGP-5-PORTTOSTP:Port 3/4 joined bridge port 3/1-4
Step 4 After the EtherChannel bundle is negotiated, use the show port
channel command to verify the configuration.
Switch_A> (enable) show port channel
Port Status Channel Channel Neighbor Neigh
bor
mode status device port
----- ---------- --------- ----------- ------------------------- -----
-----
1/1 connected desirable channel WS-C4003 JAB023806(Sw 3/1
1/2 connected desirable channel WS-C4003 JAB023806(Sw 3/2
1/3 connected desirable channel WS-C4003 JAB023806(Sw 3/3
1/4 connected desirable channel WS-C4003 JAB023806(Sw 3/4
----- ---------- --------- ----------- ------------------------- -----
-----
Switch_A> (enable)
Switch_B> (enable) show port channel
Port Status Channel Channel Neighbor Neigh
bor
mode status device port
----- ---------- --------- ----------- ------------------------- -----
-----
3/1 connected auto channel WS-C5000 009979082(Sw 1/1
3/2 connected auto channel WS-C5000 009979082(Sw 1/2
3/3 connected auto channel WS-C5000 009979082(Sw 1/3
3/4 connected auto channel WS-C5000 009979082(Sw 1/4
----- ---------- --------- ----------- ------------------------- -----
-----
Switch_B> (enable)
15 The cisco 1605 has two Ethernet ports. Are these two ports in the same network segment (equivalent to two ports on the hub) or different network segments.
I think the key is my own definition, which can be found on different network segments.
16 In addition to 2600, which low-end models do CISCO have E1 interfaces?
Anyone with wan interface will have E1 interface. There are 1000 and 1600.
17 1601, ping The Ethernet address of this 1601 cannot be addressed. Please ask what the problem is? But you can communicate normally, what's going on?
Check the routing table, delete the redundant routes, or shutdown all interfaces, and no shutdown again
18 quidway 2500 is a copy of CISCO 2500. I used its S0 port as the DDN port, and the A1 port is used as the backup dial port for DDN. If the DDN is disconnected, the A1 port will automatically dial.
My question is: When DDN is restored, A1 will DOWN and then UP my S0 port, but the dial-up MODEM connected to the A1 port is constantly. That is to say, while I pay for DDN, I also have to pay for the phone. Regarding the settings of MODEM, Quidway has its own MODEM script configuration, and the settings of the MODEM response method.
Normally, you can set it down a1 after a certain time.
19 Due to the large number of DDN dedicated line users access, does China Telecom provide channelized E2 or E3 circuit rental?
Cisco has channelized E2 or E3 cards. We mainly use 64K or 128K enterprise access. If E1 is used, there are many lines and it is difficult to manage.
If it is really a very large number, there is no need to draw channels. You can share large exports, and the cost is much lower than the channels. Regarding large-capacity transmission, Telecom can provide ATM port rental, which is called digital circuit in Shenzhen's tariff table. From 2M, you can reach 155M.
My business is similar to you
I mean, it is not necessary to draw channels. One is that the cost is high, the other is that the equipment is limited, and the purpose of excessive reliance on telecommunications is to ensure service quality. For the access customers, the method of establishing their own network can be adopted. When accessing customers have a certain scale, the method of ensuring that the export bandwidth occupancy rate is less than a certain proportion (such as 60%) can be adopted to achieve service quality similar to channel type. At the same time, the own network can adopt multiple exits, which improves the availability of the network. The backbone network uses SDH 155M, connects 7507 POS board, connects 3524 1000M ports, and the 100M below is connected to each Sun Enterprise Server, and each hosting server has exclusive 10M bandwidth.
There are 30 relay E1s, of which 20 are used for PSTN access, 10 PRI E1s are used for ISDN access, and some are rented for local data communication bureau DDN circuits for dedicated line access.
When necessary, buy ADSL contacts, but you must have a good relationship with the telephone company, and it can only cover within 5 kilometers at present.
20 What is GE1?
It is CE1. Channelized E1.
Yes channel e1, which is 2M that can divide channels.
21 I use E1 to connect to CISCO AS5300. How to connect PSTN and E1? Did it be made by Telecom? How to determine the dial number?
Telecommunications should give you a number selected.
Telecom will give you an E1 cable from the program control side. You just need to regard it as a telephone cable, but it is just a 30-channel.
22 I have a CISCO 2501 router, which is connected to two DDN dedicated lines, both of which are 128K, respectively, and one server is used as a WEB server. I don’t know how to make the two DDNs equal to 256K instead of repeating 128K data transmission? Please give a detailed introduction.
use the routing protocol that can load balance such as Eigrp
or igrp or OSPF etc....
Use static routing directly:
Load balancing
23 Dear shrimps, I forgot my password for CATALYST 2901. How can I clear it?
Step 1:
Attach a terminal or PC with terminal emulation to the admin (console) port of the switch.
Use the following terminal settings : 9600 baud, no parity, 8 data bits, 1 stop bit
Step 2:
Power the switch down, then up.
Step 3:
When you see the password prompt, press Enter (no password within 30seconds).
When asked for a password, just press the enter key within 30 seconds.
A common mistake is to type 'null' as password.
Step 4:
Go into enable mode.
Type 'enable' at the prompt.
Step 5:
When you see the password prompt, press Enter (null password for 30 seconds).
When asked for a password, just press the enter key within 30 seconds.
A common mistake is to type 'null' as password.
Step 6:
Change the password.
Use the 'set password' and/or 'set enablepass' command. When asked to
give the old password, just hit enter (this works only within 30 seconds!).
24 For example, the 26XX series and 36XX series routers can have 16 asynchronous ports. How to use these asynchronous ports does not need to be directly connected to the terminal through a dedicated terminal server or PC server, that is, the router itself becomes a terminal server.
in 36xx first "show line to find the No. of line"second"
(config)# line x y
transport input all
then connect your async cable to other router's console port
then config name and port number for these routers
for example
ip host r1 2001 1.1.1.1
ip host r2 2002 1.1.1.1
ip host r3 2003 1.1.1.1
the 200x is 2000+ x (line No.) if your line number in show line is
17 then you get 2017.
then in this router you can type r1 to the R1 router.
hope this helps
//
could you please explain "connect your async cable to other router's c
onsole port"
I am kinda confused on it
//
This is exactly the concept of the so-called Reverse Telnet.
In actual network management, you can modify the router configuration to remote Telnet or Console, but the workspace of the administrator is a distance from the computer room, so the Console line is not commonly used, and many times you do need to use Console. At this time, you can use a 2509 or 2511 to connect the asynchronous line to the Console ports of each router and switch, and then telnet 200x, or a more convenient way is to define some easy-to-remember hostnames, so as long as telnet xxxxxxx on 2509 is enough. You can search for specific concepts and operation steps on the CD.
//
I will give you one example for it and it's easy and basic for
Cisco lab. (this is for 2511 who config line 1 16 ) for 36/26 it maybe other numbers. use show line to find the number out.
(I connect r2 to 2511 Async-port 2, r3 to As3 (line 3) etc....)
r1#
r1#sh conf
Using 577 out of 32762 bytes
!
version 11.2
no service udp-small-servers
no service tcp-small-servers
!
hostname r1
!
enable password cisco
!
ip subnet-zero
no ip domain-lookup
ip host r2 2002 10.1.1.1
ip host r3 2003 10.1.1.1
ip host r4 2004 10.1.1.1
ip host r5 2005 10.1.1.1
!
interface Loopback1
ip address 10.1.1.1 255.255.255.255
!
interface Ethernet0
no ip address
shutdown
!
interface Serial0
no ip address
shutdown
!
interface Serial1
no ip address
shutdown
!
ip classless
!
!
line con 0
exec-timeout 0 0
line 1 16
transport input all
line aux 0
line vty 0 4
password cisco
login
!
end
r1#r5
Trying r5 (10.1.1.1, 2005)...
% Connection refused by remote host
r1#clear line 5
[confirm]
[OK]
r1#clear line 2
[confirm]
[OK]
r1#clear line 3
[confirm]
[OK]
r1#
r1#clear line 4
[confirm]
[OK]
r1#clear line 1
[confirm]
[OK]
r1#r5
Trying r5 (10.1.1.1, 2005)... Open
00:00:02: 0: stTransl
r1#r2
Trying r2 (10.1.1.1, 2002)... Open
Router>
r1#r3
Trying r3 (10.1.1.1, 2003)... Open
Router>
r1#r4
Trying r4 (10.1.1.1, 2004)... Open
Router>
r1#w
Conn Host Address Byte Idle Conn Name
1 r5 10.1.1.1 50 0 r5
2 r2 10.1.1.1 0 0 r2
3 r3 10.1.1.1 0 0 r3
* 4 r4 10.1.1.1 0 0 r4
r1#1
[Resuming connection 1 to r5 ... ]
ating "Router"...domain server (255.255.255.255)
Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#host r5
r5(config)#end
r5#wr
Building configuration...
r1#w
Conn Host Address Byte Idle Conn Name
* 1 r5 10.1.1.1 3 0 r5
2 r2 10.1.1.1 0 0 r2
3 r3 10.1.1.1 0 0 r3
4 r4 10.1.1.1 0 0 r4
r1#2
[Resuming connection 2 to r2 ... ]
Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#host r2
r2(config)#end
r2#wr
Building configuration...
[OK]
r2#
r1#3
[Resuming connection 3 to r3 ... ]
Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#host r3
r3(config)#end
r3#wr
Building configuration...
r1#4
[Resuming connection 4 to r4 ... ]
Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#host r4
r4(config)#end
r4#wr
Building configuration...
r1#w
Conn Host Address Byte Idle Conn Name
1 r5 10.1.1.1 3 0 r5
2 r2 10.1.1.1 4 0 r2
3 r3 10.1.1.1 5 0 r3
* 4 r4 10.1.1.1 0 0 r4
r1#disc 1
Closing connection to r5 [confirm]
r1#disc 2
Closing connection to r2 [confirm]
r1#w
Conn Host Address Byte Idle Conn Name
3 r3 10.1.1.1 5 0 r3
* 4 r4 10.1.1.1 5 0 r4
r1#disc 3
Closing connection to r3 [confirm]
r1#disc 4
Closing connection to r4 [confirm]
r1#r5
Trying r5 (10.1.1.1, 2005)... Open
flashfs[8]: 1 files, 1 directories
flashfs[8]: 0 orphaned files, 0 orphaned directories
flashfs[8]: Total bytes: 16320000
flashfs[8]: Bytes used: 6345728
flashfs[8]: Bytes available: 9974272
flashfs[8]: flashfs fsck took 39 seconds.
flashfs[8]: Initialization complete.
r5#
r1#r2
Trying r2 (10.1.1.1, 2002)... Open
r2#
r1#r3
Trying r3 (10.1.1.1, 2003)... Open
r3#
r1#r4
Trying r4 (10.1.1.1, 2004)... Open
r4#
r1#w
Conn Host Address Byte Idle Conn Name
1 r5 10.1.1.1 0 0 r5
2 r2 10.1.1.1 0 0 r2
3 r3 10.1.1.1 0 0 r3
* 4 r4 10.1.1.1 0 0 r4
r1#1
[Resuming connection 1 to r5 ... ]
r5#
hope this helps and these are reverse-telnet.
25 I mistakenly operated Erease flash on a cisco2611, and as a result, I entered the romon 1 state every time I started. I asked someone that I deleted iOS, what should I do????, Who can save me! ! I only have a 2611cisco router here! How slow is it to pass through CONSOLE?
In fact, after entering the ROMMON state, you can still use TFTP to transmit IOS via Ethernet oral.
I've done that. However, some TFTP parameters must be assigned in the ROMMON state.
Such as: native IP, TFTP SERVER IP, default gateway, file name...
(Special note: 1. The router uses E0/0 port by default, and it seems that it cannot be changed, but there is no need to change it;
2. The 6 or 7 parameters required under the TFTP must be set, including those that you seem useless, such as: DEFAULT_GATEWAY, etc. )
it's very easy. you can find it on cco by search "xmodem"
following are a brief:
1. download IOS to your pc
2. connect the PC with hyper-terminal 's comm port to console of
2610 with the console kit (provided by cisco)
3. set your terminal's speed to 9600 0r higher, as i know 26xx support
console speed upto 115200.
4. rommon > xmodem -s9600 -c (if the rommon can set speed)
if not just xmodem the def speed 9600
Do not start sending the image yet...
Invoke this application for disaster recovery.
Do you wish to continue? y/n [n]: y
Note, if the console port is attached to a modem, both the
console port and the modem must be operating at the same baud
rate. Use console speed 9600 bps for download [confirm]
Download will be performed at 9600. Make sure your terminal
emulator is set to this speed before sending file.
Ready to receive file ...
Returning console speed to 9600.
6. in hyper-terminal use tranbsfer-->send file to select the file to s
end
7. after ios download reboot the machine
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