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Spanning Tree instance maximum

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clifford.gormley
Beginner
Beginner

‎06-02-2013 06:28 PM - last edited on ‎03-25-2019 04:24 PM by Community Manager

Hello

I read that there is a limit of 128 spanning-tree instances per switch if using PVST, and that any instances greater than 128 do not us spanning-tree.

Does the switch indicate that the 128-instance limit has been reached?  Or do you just need to determine this by using SHOW SPANNING-TREE XXXX commands?
Thanks           

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Reza Sharifi
Hall of Fame
Hall of Fame

‎06-02-2013 07:05 PM

Hi,

Not sure exactly what the error message would be if you try to configure more then 128 instances, but if you are planning to have 129 instances, you would need to delete one of the existing instance before you can add the 129th instance.

sh span-tree will show you one vlan per instance, but the numbers don't necessary corelate  For example: if you have 2 instances in your switch, the vlans for these instance can be 250 and 270.

HTH

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