3750 Stack Master Re-election

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Nov 16th, 2007
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We are running through some test scenarios before deploying a 3750 stack into production.


The only issue we have really run into is when we physically lose the stack master, i.e. pulling the plug. Our default gateway is on a core switch. When we unplug the stackmaster, all local layer 2 traffic on the stack comes right back up.


But we cannot get to the default gateway for 45 seconds. Basically I guess the re-election is happening in the background...or I could be wrong.


Anyway, am I looking at the right thing or should I be looking somewhere else, or is that just how it is.


I say 45 seconds because we can replicate the situation on demand and the results are the same everytime.


Thanks in advance

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Nicholas Poole Fri, 11/16/2007 - 10:51
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When I have tested a stack master failure I have seen outages of about 25-34 seconds. I believe it is stack ring negotiation which is going on.


Have you set the stack priority in a determined order such as 15,14,13,12,11...?

e.huntley Fri, 11/16/2007 - 10:54
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Yes, I have. If you have seen an extended period then that helps some to at least know it takes some time. I just wanted to make sure I was not missing some hidden paramater or something.


Thank You

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