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cisco 2960s with flexstack

Posted on 2014-01-24
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I have 3 2960s with flexstack features.  Can I connect those switches to the core like my diagram (see attached)?
Is there any config sample on how to configure the master and slave?

Thanks
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Question by:leblanc
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by:Miftaul
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Are you stacking them or simply connecting them together.
With your diagram, stp is blocking some ports. You could make different core switch root for different VLAN.

Doing a "Show Switch" on any of the stacked switches will tell the current master.
Here is the Cisco documentation on 2960-S FlexStack - Link
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by:leblanc
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I want to stack them. From my understanding, with the flexstack, those 3 switches will act like one. Correct?
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by:Miftaul
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Yes, flexstack will make them act like one stacked switch fabric.
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by:leblanc
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I am running hsrp on those core1 and core2. Then my connection for switch0 to core1 and switch3 to core2 shoudl work. Correct? Or does it have to be switch0 to core1 and switch0 to core2? Thanks
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by:Miftaul
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As long as its flexstacked, it is a single stacked switch. For HSRP, you still need to connect from the Master Switch0.
FlexStack is not a switch cluster.
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by:leblanc
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So let say the master is switch0, so I have to connect switch0 to core1 and switch0 to core2. Correct?

What's the difference between flexstack and switch cluster?
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by:Miftaul
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Yes exactly, you still need to connect to Switch0.

Here is the Cisco document on Stacking Vs Clustering - Link
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Craig Beck earned 100 total points
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It doesn't matter which switch connects to the core switches if you stack the 2960s.

If you wanted to you could even use MEC to connect multiple links from multiple physical switches to each core.

So for example, you could create a PortChannel on switch 2 and core 1 and connect them together, then create a PortChannel on switch 3 and core 2 and connect them together.  It would work fine.  The master doesn't have to be used.

Cisco have a FlexStack stacking design guide which details best practices for connecting stacked switches.  This guide actually mentions NOT using the stack master to terminate uplinks if possible, especially in 3 or 4-switch stacks to minimize traffic disruption in the event of a stack-master failure.

Also, if you use two uplinks in a 4-switch stack, don't connect them to directly-connected switches, such as switch 1 and 2.  You should instead use switch [2 and 4], or [1 and 3], but not [1 and 2], or [2 and 3], or [3 and 4], or [4 and 1].  You don't have to do this, but it should make most efficient use of stack-bandwidth if you do.

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps6406/white_paper_c11-578928.html

Specifically the "Recommended Deployment Strategies for Building FlexStack" section.
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Thank you very much for your inputs. It is certainly very helpful. I will look at the white papers in more details.
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