Solved: Maximum spanning tree instances

thomas.feichter · ‎06-11-2007

Hi,

is there an IOS command to see the max. spanning tree instances on a Switch??

I found the description only on the Datasheets on Cisco.com...

Are the max. STP instances only Hardware related or also IOS?

Thanks and regards,

Thomas Feichter

ariela · ‎06-11-2007

Hi,

3550: 128

3560: 128 (or 16 MST)

6500: 16 MST

2950: 64

HTH

Andrea

View solution in original post

royalblues · ‎06-11-2007

There is a limitation on the number of instances of STP that a switch can handle.

The Catalyst 2912 XL, Catalyst 2924 XL, and Catalyst 2924C XL support only 64 STP instances and 64 VLANs. All other Catalyst 2900 XL switches and all Catalyst 3500 XL switches support 64 STP instances and 250 VLANs.

The 3750 switches support 128 STP instances.

Ensure that the total number of logical ports across all instances of STP for different VLANs does not exceed the maximum number supported. If you exceed these STP instance recommendations, the switch exhibits high CPU utilization

HTH, rate if it does

Narayan

thomas.feichter · ‎06-11-2007

Hi,

you know also how many instances supports the Cat 3550,3560,6500,2950?

Regards,

Thomas

ariela · ‎06-11-2007

Hi,

3550: 128

3560: 128 (or 16 MST)

6500: 16 MST

2950: 64

HTH

Andrea