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New Member

VTP Pruning probleme

Hi all,

I have experienced a probleme with VTP pruning (with RSTP).

Before configuring the entire network, i have make a small network disconnected from the other to test pruning.

In the test, all switch learn the vlan and no vlan pass but the one.

Probleme, when i type the command "show interface trunk" on a 2950C (the vtp server is a 3550), i see a vlan number 7. But the 2950C has no "UP" interface in this vlan. Even the 2950C have only one connection (trunk) to the 3550, the vlan 7 is shown with the command "show interface trunk". The result of the command "sh int tru" on the 3550 is OK. I only see the vlan that should cross to the 2950C.

Has someone have an idea of the problem ?

info

IOS 12.1.22.EA4 on 2950

IOS 12.1.14.EA1a on 3550

4 REPLIES
Purple

Re: VTP Pruning probleme

It doesn't matter if you don't have a port up in the vlan , the show int trunk command just shows what vlans are allowed across the trunk not what vlans are actually up on the box . This is governed by the switchport trunk allowed vlan XX " command that is on the interface . Check the interface on the 2950 and see what is being allowed across on that side . Also make sure the 2950 is indeed setup as client in the network and not a server .

New Member

Re: VTP Pruning probleme

hello,

All vlan are allowed to pass through the trunk. And i make the pruning on the VTP to avoid the use of the command "switchport trunk allow vlan X-Z".

also, 2950 are in client mode...

ovt Bronze
Bronze

Re: VTP Pruning probleme

Does 3550 have access port(s) in vlan 7? If yes, 2950 should be able to send vlan 7 broadcasts to 3550 and vlan 7 shouldn't be pruned from the trunk. Anyway I'd suggest to upgrade both switches.

New Member

Re: VTP Pruning probleme

hello,

3550 have only interface trunk and no access port int vlan 7.

anyway, thanks for help

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