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Webcast-Catalyst9k
New Member

Two 802.1Q trunk links between two Layer2 switches

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

3 REPLIES
Hall of Fame Super Blue

Re: Two 802.1Q trunk links between two Layer2 switches

Hi

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.

Jon

Hall of Fame Super Bronze

Re: Two 802.1Q trunk links between two Layer2 switches

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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Edison.

New Member

Re: Two 802.1Q trunk links between two Layer2 switches

Thanks for your advice.

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