From: Jason Cash (cash2001@swbell.net)
Date: Wed Jun 25 2003 - 19:06:11 GMT-3
i have a question about vtp pruning on 3550s. I have 2 switches:
3550-1
F3/5 vlan56
F3/23-24 Port Channeling to 3550-2
3550-2
F0/4 vlan4
F0/6 trunking vlan56,76
F0/7 vlan76
F0/8 vlan8
F0/9 vlan9
F0/23-24 Port Channeling to 3550-1
VTP pruning is enabled on both switches. 3550-1 has no ports in vlan 4,8,9
but when i do a 'sh vlan' on 3550-1, the vlans are being listed:
3550-1>sh vlan
VLAN Name Status Ports
---------------------------------------------------------
1 default active Fa3/6
4 VLAN0004 active
8 VLAN0008 active
9 VLAN0009 active
56 VLAN0056 active Fa3/5
76 VLAN0076 active
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
Also, 'show int trunk' lists those vlans as not pruned:
3550-1#sh int trunk
Port Mode Encapsulation Status Native vlan
Po1 desirable n-isl trunking 1
Port Vlans allowed on trunk
Po1 1-4094
Port Vlans allowed and active in management domain
Po1 1,4,8-9,56,76,1002-1005
Port Vlans in spanning tree forwarding state and not pruned
Po1 1,4,8-9,56,76,1002-1005
Whereas on 3550-2, those ports are pruned:
3550-2#sh int trunk
Port Mode Encapsulation Status Native vlan
Fa0/6 on 802.1q trunking 1
Po1 desirable n-802.1q trunking 1
Port Vlans allowed on trunk
Fa0/6 1,56,76,1002-1005
Po1 1-4094
Port Vlans allowed and active in management domain
Fa0/6 1,56,76
Po1 1,4,8-9,56,76
Port Vlans in spanning tree forwarding state and not pruned
Fa0/6 1,56,76
Po1 1,56
Is this normal operation? My understanding of VTP pruning is that traffic
on ports that are prune eligible, would not be transmitted across the trunk
to a switch that has no ports in that vlan.
This archive was generated by hypermail 2.1.4 : Fri Jul 04 2003 - 11:11:09 GMT-3