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Author Topic: Spanning tree on or off when using LACP ?  (Read 4376 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 »
Hi

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?
thanks
Steve


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
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