Two 802.1Q trunk links between two Layer2 switches

Unanswered Question
Feb 6th, 2008

I have two Cisco 6500 switches and plan to connect two switches together via Gigabit ports, we want to configure two links as separate trunks, and first trunk only allow even # VLAN to pass through it and the secondary trunk will only allow odd 3 of VLAN to pass through via command " switchport trunk allowed vlan xxx, xxx "

The question is that will this create Spanning tree loop issues betweeb the two switches. Or PVST feature still apply here.

Thanks in advance

I have this problem too.
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Jon Marshall Wed, 02/06/2008 - 13:18


No you should be fine as long as i understand you correctly ie. you have 2 trunks connecting a pair of 6500 switches. On trunk you are allowing the even vlans and on the other trunk you are allowing odd vlans.


Edison Ortiz Wed, 02/06/2008 - 14:58

I agree with Jon, you shouldn't have any problems and actually that design is quite common as a Layer2 load-balancing design.




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