A friend said he encountered a strange problem: there is a 4006 backbone switch in his network for inter-VLAN routing; there are more than a dozen 2924 desktop switches and a 3640 egress router. He installed Ciscoworks 2000 LAN Solution Software Suite (LMS) 2.0 on a WINNT 4.0 + SP6 + IE5.5SP2 machine. The problem is that when viewing the topology diagram of the network in Campus Manager - Topology Serverices - Layer 2 view, he could only see one 2924 and 4006 and 3640, while the other 2924s were not visible.
I immediately replied to him: First, check the connectivity. Can the network management machine ping these floor switches? Secondly, check the SNMP settings. Is the Community String settings of each device the same? Finally, confirm the connection via cdp: Can you see other neighbors on each switch?
This friend replied that the above tests were all successful, the settings were correct, and a 2924 configuration was provided:
[Omitted...]
!
hostname Switch
!
enable secret 5 $1$0IKdsftjsjdKKLJfLoNkhUJN;L
!
ip subnet-zero
!
interface FastEthernet0/1
switchport access vlan 2
[Omitted...]
!
interface FastEthernet0/24
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface VLAN1
ip address 10.1.1.1 255.255.255.0
no ip directed-broadcast
no ip route-cache
!
snmp-server engineID local 0000039384830075035BFC0
snmp-server community xxxx RO
snmp-server community yyyy RW
!
[Omitted...]
He also said that he reinstalled the system again, and this time he used Windows 2000 + IE6, and the problem remained the same. So I asked him: a) describe the ip/mask/gateway of the network management machine. b) describe the discovery setting (including the options of seed device and Jump Router Boundary) and SNMP Setting in the ciscoworks:server setup. He also asked him to provide the 4006 configuration and the output of show cdp nei and show cdp nei details. Finally, he asked him: Is the telnet management of these unfound switches normal? What about the web interface? Does the speed feel normal?
He told me that the network speed is normal and the switch can be managed by telnet and other methods; the "Spanning the router boundary" option in Discovery Setting has been selected (if you do not select this item, you will not look for devices on network segments outside the network management workstation); SNMP Setting edited as: 192.168.21.[1-16]:test:::::::::testnx. I suspect there is a problem with this syntax, so please change it to *.*.*.* first. The SE configuration he provided for 4006 looks correct, and Show cdp nei has all the 2924 switches, but he does not provide the output of Show cdp nei detail.
[4006 Configuration Summary]
#snmp
set snmp community read-only xxxx
set snmp community read-write yyyy
set snmp community read-write-all yyyy
#vtp
set vtp domain xxxx
set vlan 1 name default type ethernet mtu 1500 said 100001 state active
set vlan 1 ...
!
#ip
set interface sc0 1 10.1.1.21/255.255.255.0 10.1.1.255
set ip route 0.0.0.0/0.0.0.0 10.1.1.254
!
#module 2 : 34-port Router Switch Card
set trunk 2/1 on dot1q 1-1005
!
#module 3 : 24-port 100BaseFX Ethernet
set trunk 3/1 on dot1q 1-1005
!
He also observed that if the devices displayed on the topology map are deleted and rediscovered (Discovery), they can still find one of them 2924, and maybe that one can be found.
So my suspicion focused on the configuration of 2924, and I asked him: What method is used to match 2924? Copy and paste? Check whether the number on each machine is the same: snmp-server engineID local 0000039384830075035BFC0 If so, it will be changed to different. It is best to delete the configuration and let it be generated automatically. In addition, please provide me with the configuration of three 2924s and the output of show cdp nei DETAIL on 4006.
As a result, compared the configurations of the three 2924s, it was found that the snmp-server engineIDs are different from each other, but the host names all use the default "Switch", which can also be seen from the show cdp nei detail output. After setting a different name for these switches, rediscovering, the topology diagram will be displayed normally.
LMS 2.0 has many improvements compared with previous versions. One of the points is that it can display the host name (System name), while previous versions can only display the IP address of the device. Unexpectedly, such a bug broke out. I briefly document the solution process of this problem here, hoping to provide you with an idea to find Ciscoworks 2000 problems. Article entry: csh Editor in charge: csh
I immediately replied to him: First, check the connectivity. Can the network management machine ping these floor switches? Secondly, check the SNMP settings. Is the Community String settings of each device the same? Finally, confirm the connection via cdp: Can you see other neighbors on each switch?
This friend replied that the above tests were all successful, the settings were correct, and a 2924 configuration was provided:
[Omitted...]
!
hostname Switch
!
enable secret 5 $1$0IKdsftjsjdKKLJfLoNkhUJN;L
!
ip subnet-zero
!
interface FastEthernet0/1
switchport access vlan 2
[Omitted...]
!
interface FastEthernet0/24
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface VLAN1
ip address 10.1.1.1 255.255.255.0
no ip directed-broadcast
no ip route-cache
!
snmp-server engineID local 0000039384830075035BFC0
snmp-server community xxxx RO
snmp-server community yyyy RW
!
[Omitted...]
He also said that he reinstalled the system again, and this time he used Windows 2000 + IE6, and the problem remained the same. So I asked him: a) describe the ip/mask/gateway of the network management machine. b) describe the discovery setting (including the options of seed device and Jump Router Boundary) and SNMP Setting in the ciscoworks:server setup. He also asked him to provide the 4006 configuration and the output of show cdp nei and show cdp nei details. Finally, he asked him: Is the telnet management of these unfound switches normal? What about the web interface? Does the speed feel normal?
He told me that the network speed is normal and the switch can be managed by telnet and other methods; the "Spanning the router boundary" option in Discovery Setting has been selected (if you do not select this item, you will not look for devices on network segments outside the network management workstation); SNMP Setting edited as: 192.168.21.[1-16]:test:::::::::testnx. I suspect there is a problem with this syntax, so please change it to *.*.*.* first. The SE configuration he provided for 4006 looks correct, and Show cdp nei has all the 2924 switches, but he does not provide the output of Show cdp nei detail.
[4006 Configuration Summary]
#snmp
set snmp community read-only xxxx
set snmp community read-write yyyy
set snmp community read-write-all yyyy
#vtp
set vtp domain xxxx
set vlan 1 name default type ethernet mtu 1500 said 100001 state active
set vlan 1 ...
!
#ip
set interface sc0 1 10.1.1.21/255.255.255.0 10.1.1.255
set ip route 0.0.0.0/0.0.0.0 10.1.1.254
!
#module 2 : 34-port Router Switch Card
set trunk 2/1 on dot1q 1-1005
!
#module 3 : 24-port 100BaseFX Ethernet
set trunk 3/1 on dot1q 1-1005
!
He also observed that if the devices displayed on the topology map are deleted and rediscovered (Discovery), they can still find one of them 2924, and maybe that one can be found.
So my suspicion focused on the configuration of 2924, and I asked him: What method is used to match 2924? Copy and paste? Check whether the number on each machine is the same: snmp-server engineID local 0000039384830075035BFC0 If so, it will be changed to different. It is best to delete the configuration and let it be generated automatically. In addition, please provide me with the configuration of three 2924s and the output of show cdp nei DETAIL on 4006.
As a result, compared the configurations of the three 2924s, it was found that the snmp-server engineIDs are different from each other, but the host names all use the default "Switch", which can also be seen from the show cdp nei detail output. After setting a different name for these switches, rediscovering, the topology diagram will be displayed normally.
LMS 2.0 has many improvements compared with previous versions. One of the points is that it can display the host name (System name), while previous versions can only display the IP address of the device. Unexpectedly, such a bug broke out. I briefly document the solution process of this problem here, hoping to provide you with an idea to find Ciscoworks 2000 problems. Article entry: csh Editor in charge: csh