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Author Topic: Spanning tree on or off when using LACP ?  (Read 4524 times)

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Offline scmcdonald

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Spanning tree on or off when using LACP ?
« on: October 15, 2013, 11:18:46 PM »

When configuring LACP what is the best practice, do I enable spanning tree or disable it on LACP trunks to other switches? or should it even matter?

We have a number of Avaya 5520 and 5650 pure and mixed stacks. Over the last week or so I have been setting up LACP links  between Avaya stacks  and a Juniper EX8208 virtual chassis core.

In some cases, if spanning tree is left enabled on a LACP trunk it takes ~45-50 seconds before packets are forwarded over the link whenever one of the links in the LACP trunk is disconnected and reconnected. But in other cases/stacks there is almost no delay. Not sure why there is inconsistencies between stacks.

So what is he best practice, enable or disable spanning tree on LACP trunks?

Offline MatzeKS

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    • matzeks
    • Controlware GmbH - Germany
Re: Spanning tree on or off when using LACP ?
« Reply #1 on: October 16, 2013, 03:57:35 AM »
Hi scmcdonald,

every time you aggregate Links with AVAYA switches you have to disable Spanning tree on all of those links.

Good luck
ACE-Fx #00050