Network environment: a 3550EMI switch, divided into three vlans and vlan2, which are the network where the server is located, named server, IP address segment is 192.168.2.0, subnet mask: 255.255.255.0, gateway: 192.168.2.1, domain server is Windows 2000 advance server, and it also serves as a DHCP server and DNS server, IP address is 192.168.2.10, vlan3 is the network where the client 1 is located, IP address segment is 192.168.3.0, subnet mask: 255.255.255.0, gateway: 192.168.3.1 is named work01, vlan4 It is the network where client 2 is located, named work02, the IP address segment is 192.168.4.0, the subnet mask: 255.255.255.0, and the gateway: 192.168.4.1.
3550 is divided into VLAN 2, ports 9-16 are divided into VLAN 3, and ports 17-24 are divided into VLAN 4.
The configuration commands and steps are as follows:
Step 1: Create a VLAN:
Switch>Vlan Database
Switch(Vlan)>Vlan 2 Name server
Switch(Vlan)>Vlan 3 Name work01
Switch(vlan)>Vlan 4 Name work02
Step 2: Enable DHCP Relay Agent:
/*A key step, if the following two commands are missing, use "IP HELPER-ADDRESS DHCP Server Address" to specify the DHCP server in the VLAN, and the client still cannot obtain the IP address*/
Switch>Enable
Switch#Config t
Switch(Config)Service Dhcp
Switch(Config)Ip Dhcp Relay Information Option
Step 3: Set the VLAN IP address:
Switch(Config)>Int Vlan 2
Switch(Config-vlan)Ip Address 192.168.2.1 255.255.255.0
Switch(Config-vlan)No Shut
Switch(Config-vlan)>Int Vlan 3
Switch(Config-vlan)Ip Address 192.168.3.1 255.255.255.0
Switch(Config-vlan)No Shut
Switch(Config-vlan)>Int Vlan 4
Switch(Config-vlan)Ip Address 192.168.4.1 255.255.255.0
Switch(Config-vlan)No Shut
Switch(Config-vlan)Exit
/*Note: Since the ports are not configured to VLAN2, 3, 4 at this time, each VLAN will DOWN. After the ports are allocated to each VLAN, the VLAN will rise*/
Step 4: Set the global port parameters
Switch(Config)Interface Range Fa 0/1 - 24
Switch(Config-if-range)Switchport Mode Access
Switch(Config-if-range)Spanning-tree Portfast
Step 5: Add ports to VLAN2, 3, 4
/*Add ports 1-8 to VLAN 2*/
Switch(Config)Interface Range Fa 0/1 - 8
Switch(Config-if-range)Switchport Access Vlan 2
/*Add port 9-16 to VLAN 3*/
Switch(Config)Interface Range Fa 0/9 - 16
Switch(Config-if-range)Switchport Access Vlan 3
/*Add port 17-24 to VLAN 4*/
Switch(Config)Interface Range Fa 0/17 - 24
Switch(Config-if-range)Switchport Access Vlan 4
Switch(Config-if-range)Exit
/*After this step, each VLAN will get up*/
Step 6: Set the DHCP server address in VLAN3 and 4
/*DHCP server address is not required in VLAN 2*/
Switch(Config)Int Vlan 3
Switch(Config-vlan)Ip Helper-address 192.168.2.10
Switch(Config)Int Vlan 4
Switch(Config-vlan)Ip Helper-address 192.168.2.10
Step 7: Enable routing
/*After routing is enabled, the hosts between each VLAN can access each other. If you need to further control access rights, it needs to be applied to the access control list*/
Switch(Config)Ip Routing
Step 8: End and save the configuration
Switch(Config-vlan)End
Switch#Copy Run Start Article entry: csh Editor in charge: csh
3550 is divided into VLAN 2, ports 9-16 are divided into VLAN 3, and ports 17-24 are divided into VLAN 4.
The configuration commands and steps are as follows:
Step 1: Create a VLAN:
Switch>Vlan Database
Switch(Vlan)>Vlan 2 Name server
Switch(Vlan)>Vlan 3 Name work01
Switch(vlan)>Vlan 4 Name work02
Step 2: Enable DHCP Relay Agent:
/*A key step, if the following two commands are missing, use "IP HELPER-ADDRESS DHCP Server Address" to specify the DHCP server in the VLAN, and the client still cannot obtain the IP address*/
Switch>Enable
Switch#Config t
Switch(Config)Service Dhcp
Switch(Config)Ip Dhcp Relay Information Option
Step 3: Set the VLAN IP address:
Switch(Config)>Int Vlan 2
Switch(Config-vlan)Ip Address 192.168.2.1 255.255.255.0
Switch(Config-vlan)No Shut
Switch(Config-vlan)>Int Vlan 3
Switch(Config-vlan)Ip Address 192.168.3.1 255.255.255.0
Switch(Config-vlan)No Shut
Switch(Config-vlan)>Int Vlan 4
Switch(Config-vlan)Ip Address 192.168.4.1 255.255.255.0
Switch(Config-vlan)No Shut
Switch(Config-vlan)Exit
/*Note: Since the ports are not configured to VLAN2, 3, 4 at this time, each VLAN will DOWN. After the ports are allocated to each VLAN, the VLAN will rise*/
Step 4: Set the global port parameters
Switch(Config)Interface Range Fa 0/1 - 24
Switch(Config-if-range)Switchport Mode Access
Switch(Config-if-range)Spanning-tree Portfast
Step 5: Add ports to VLAN2, 3, 4
/*Add ports 1-8 to VLAN 2*/
Switch(Config)Interface Range Fa 0/1 - 8
Switch(Config-if-range)Switchport Access Vlan 2
/*Add port 9-16 to VLAN 3*/
Switch(Config)Interface Range Fa 0/9 - 16
Switch(Config-if-range)Switchport Access Vlan 3
/*Add port 17-24 to VLAN 4*/
Switch(Config)Interface Range Fa 0/17 - 24
Switch(Config-if-range)Switchport Access Vlan 4
Switch(Config-if-range)Exit
/*After this step, each VLAN will get up*/
Step 6: Set the DHCP server address in VLAN3 and 4
/*DHCP server address is not required in VLAN 2*/
Switch(Config)Int Vlan 3
Switch(Config-vlan)Ip Helper-address 192.168.2.10
Switch(Config)Int Vlan 4
Switch(Config-vlan)Ip Helper-address 192.168.2.10
Step 7: Enable routing
/*After routing is enabled, the hosts between each VLAN can access each other. If you need to further control access rights, it needs to be applied to the access control list*/
Switch(Config)Ip Routing
Step 8: End and save the configuration
Switch(Config-vlan)End
Switch#Copy Run Start Article entry: csh Editor in charge: csh