[c-nsp] Troubleshooting vtp pruning

[Victor Sudakov]

Colleagues,

How exactly does VTP pruning function, or rather, why does it not
function as I expect?

There are several switches running VTPv3, each is a VTP server, one of
them is primary. VTP pruning is enabled on each switch, e.g.

sw-petkul#sh vtp status | i Prun
VTP Pruning Mode                : Enabled

There are some VLANs that are only in use on one or two switches in
the whole network. However, when I look at "sh int trunk" on other
swithces, including edge swithces, I see that no vlans are actually
pruned:

Port        Vlans allowed and active in management domain
Gi0/1       1,3,10,20,22,24-28,30,32,34,36,200,308
Gi0/2       1,3,10,20,22,24-28,30,32,34,36,200,308

Port        Vlans in spanning tree forwarding state and not pruned
Gi0/1       1,3,10,20,22,24-28,30,32,34,36,200,308
Gi0/2       1,3,10,20,22,24-28,30,32,34,36,200,308
sw-petkul#

How do i troubleshoot this situation? Any help is welcome.


-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
sip:sudakov at sibptus.tomsk.ru