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.
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 .
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