vtp question

[penghon]

I have a bunch of 3548s each connected to a 4003 via dot1q trunk. VTP pruning is OFF. The 3548s are vt clients while the 4003 is the server. The scenario is that at the 4003, i had prune vlan 200 at trunk interface 3/1 which is connected to switch 3548-2. Does this mean that vlan 200 will no longer be active in switch 3548-2? A "show vlan" in the 3548-2 still shows vlan 200 as active. How can i remove vlan 200 in the 3548-2?

 

[IPKONFIG]

clear trunk <mod/port> vlan 200

&quot;I can picture a world without war. A world without hate. A world without fear. And I can picture us attacking that world, because they'd never expect it.&quot;
- Jack Handey, Deep Thoughts

 

[penghon]

&quot;show trunk&quot; on the 4003 showed that vlan 200 is not allowed on the trunk but a &quot;show vlan&quot; on the 3548 still shows vlan 200 as active. Do i need to remove the vlan 200 from the 3548 in order to prevent unnecessary vlan 200 broadcasting from reaching the 3548 via the 4003? And how can i remove vlan200 in the 3548 when it is in VTP client mode?

 

[vipergg]

This is normal , you look at the server side and see what is allowed on the trunk . The client side will always look like everything is allowed for some reason even though you have pruned them off at the server side , not a worry .

 

[penghon]

In this case, i can expect that the server (4003) will no longer send vlan 200 traffic via the trunk to the client (3548) even though the vlan 200 is active on the client?

 

[IPKONFIG]

Penghon-

Please see the same post in the router forum. Thanks

IPKONFIG

&quot;I can picture a world without war. A world without hate. A world without fear. And I can picture us attacking that world, because they'd never expect it.&quot;
- Jack Handey, Deep Thoughts

 

[ADB100]

Because you are running VTP all the VTP Clients & Servers within the VTP Domain will know about ALL the VLANs that are configured, regardless of whether they are allowed on any trunk or configured on a switch. You have to remember that VTP is just a database of VLAN ID's that will be seen on all switches within the VTP domain.

Andy

 

[penghon]

Oh, the VTP client keeps a FULL list of all VLAN IDs which is stored in the VTP server's NVRAM. Is this why when i do a &quot;show vlan&quot;, the entire list of vlans appears? And when I perform vtp pruning at the server side, I would be preventing unnecessary broadcasting packets from flowing through the trunks?

Many thanks to IPKONFIG and Andy for the sharing of your knowledge!

 

[ADB100]

IPKONFIG

Yep, thats it. If a VTP switch (client or server) has no access ports in a VLAN it is allowed to 'prune' back the VLAN from a trunk (if pruning is configured within the VTP domain). This way it stops unwanted broadcasts from these VLANs from taking any bandwidth on a trunk.

My personal preference is to not use VTP at all and configure your switches for VTP transparent or disabled.

Andy