VTP Pruning problem

[ji.xie]

Hello:

I connect a Catalyst2924 to one Catalyst6506.there are 100 Vlans on the C6506 and just 4 vlans on C2924.As you know,there is limition on 64 vlans on c2924,so I want to use VTP Pruning to permit just the four vlans used on C2924 .I have a question:when the vtp pruning is enabled,how many vlans i shall see on c2924? Thanx.

[peterbe]

I am not an expert in this area, but my understanding is VTP pruning just stops traffic for a VLAN being forwarded to the switch if there is nothing in that VLAN connected to the switch. You are better off just allowing the 4 VLANs you require on the trunk. For example, on a 3524:

int f0/1

switchport mode trunk

switchport trunk allowed vlan 1,2,4,8

And a 5500 switch, it would be something like:

clear port trunk 4/1 3,5-7,9-1000

OR

set port trunk 4/1 vlans-numbers

Hope this helps