Spanning Tree question

Answered Question
Nov 6th, 2009

Hi all, I would like to get some advise on the proper way to configure stp given the next scenario. Two core switches interconnecting via ether channel and each core switch connected to 6 other floor switches. Each floor switch is connected to each core for redundancy. I have 20 vlans configured on the core switches. Now, should I make core one the root for all the vlans? or divide them between core 1 and core 2? Thank you very much in advance for your assistance.

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Correct Answer by Jon Marshall about 7 years 1 month ago

Mauricio

You can do either really. A common setup is to

1) make core switch 1 STP root for all odd vlans and match this up with the HSRP active for the odd vlans.

2) make core switch 2 STP root for all even vlans and match this up with the HSRP active for the even vlans.

Core switch 1 will be STP secondary for even vlans and core switch 2 will be STP secondary for odd vlans.

This setup works fine and utilises both the uplinks from the floor switches.

I'm assuming that the etherchannel between the core switches is a L2 etherchannel trunk ?

Jon

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Correct Answer
Jon Marshall Fri, 11/06/2009 - 11:52

Mauricio

You can do either really. A common setup is to

1) make core switch 1 STP root for all odd vlans and match this up with the HSRP active for the odd vlans.

2) make core switch 2 STP root for all even vlans and match this up with the HSRP active for the even vlans.

Core switch 1 will be STP secondary for even vlans and core switch 2 will be STP secondary for odd vlans.

This setup works fine and utilises both the uplinks from the floor switches.

I'm assuming that the etherchannel between the core switches is a L2 etherchannel trunk ?

Jon

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