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I am deploying two Cisco 3850 24 port stackable switches and i'd like to learn more about how they work if one failed

Posted on 2014-10-22
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Last Modified: 2014-10-22
As mentioned above, I am deploying two Cisco 3850 24 Port Stackable switches.  Once deployed , one will be a Master switch and the other is a "member" but what happens if the Master switch fails (power supply).  Will we have to manually move the uplink ports to the "member " switch?

any clarification will suffice!

thanks in advance
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Question by:beckredder
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Expert Comment

by:Don Johnston
ID: 40396837
The basic idea is to run uplinks to different member switches. That way if one fails, you will still have connectivity.  Bundling the uplinks into an etherchannel group is also a good idea.
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Author Comment

by:beckredder
ID: 40396919
Thanks Don, could you elaborate in your response?

are you saying I connect an additional link to the " member " switch as a measure of fault tolerance, in case the "master" goes down?
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by:Don Johnston
ID: 40397055
Yes.  If you only have one link and the switch it is connected to fails, you will lose all connectivity through that switch.  

By having multiple links connected to different switches, you have fault tolerance against a switch failure, port failure or a link failure.
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Author Comment

by:beckredder
ID: 40397064
Thanks Don, last question then...the configuration from the "master" switch will be based through to the " member" switch (replicated) so there shouldn't be a long period of downtime if a switch goes down..?

cheers, in advance..
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Don Johnston earned 500 total points
ID: 40397087
The only downtime (assuming multiple links) would either the etherchannel failover or STP failover. Both of which would be less than 2 seconds.
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Author Closing Comment

by:beckredder
ID: 40397118
fast and easy to understand feedback...

thanks Don
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