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VLAN Setup

How to setup VLANs across two switches by baddos
Posted: 26 Mar 03

This example uses two Cisco 3524 switches to demonstrate how to use VTP to announce VLAN configuration.

Switch A - VTP Server
Switch B - VTP Client

Switch A:
!This will open the VLAN database
vlan database
 !Define this switch to be the server
 vtp server
 !Define the VTP Domain called "switchaction"
 vtp domain switchaction
 !We will make vlan #2 called "newvlan2"
 vlan 2 name newvlan2
 apply
 exit

config t
interface fastethernet0/1
 description Port assigned to VLAN2
 !Tell the switch to make this port a member of vlan2
 switchport access vlan 2
interface GigabitEthernet0/1
 description Trunk port to Switch B
 !Tell the switch to use ISL as the trunk encapsulation
 switchport trunk encapsulation isl
 !Tell the switch to use this interface as a trunk
 switchport mode trunk
 exit
exit

wr mem
exit

Switch B:
!This will open the VLAN database
vlan database
 !Define this switch to be the VTP client
 vtp client
 !Define the VTP Domain called "switchaction"
 vtp domain switchaction
 apply
 exit

config t
interface GigabitEthernet0/1
 description Trunk port to Switch A
 !Tell the switch to use ISL as the trunk encapsulation
 switchport trunk encapsulation isl
 !Tell the switch to use this interface as a trunk
 switchport mode trunk
 exit
exit
wr mem
exit

At this point, you should see if VTP has transfered the VLAN # 2 to switch B by issuing a "show vtp status" on switch B. You should notice something like this:

switch-b#show vtp status
VTP Version                     : 2
Configuration Revision          : 12
Maximum VLANs supported locally : 1005
Number of existing VLANs        : 6
VTP Operating Mode              : Client
VTP Domain Name                 : switchaction
VTP Pruning Mode                : Enabled
VTP V2 Mode                     : Disabled
VTP Traps Generation            : Disabled
MD5 digest                      : 0x6D 0x19 0x35 0x84 0x52 0x6B 0xCE 0xA0
Configuration last modified by 192.168.0.254 at 3-3-93 03:49:55
Local updater ID is 192.168.0.254 on interface Vl1 (lowest numbered VLAN interface found)

This tells us when the VTP server last updated the configurations, and how many VLANS where send by the VTP server. You can issue the "show vlan" command to list all the vlans currently on the switch. Verify that VLAN2 is on the switch, and go ahead and assign a port to the new VLAN on switch B.

Example:

switch-b#config t
interface fastethernet0/1
 !Assign Fa0/1 to vlan2
 switchport access vlan 2
 exit
exit
wr mem

Now you are all set and running. If you need to add additional vlans, simply add them to the VTP server (switch A) and the server will update the client (switch B).

Back to Cisco: Switches FAQ Index
Back to Cisco: Switches Forum

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