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Cat Express 500 & 2950 RSTP & PVST

Hi,

I have a Cat 500 connected to a 2950,

on a 802.1q trunk.

The Cat 500, seems to be running RSTP and the 2950, is capabale of only pvst.

The port seems to go into blocking state in the Cat 500.

After changing the Cat 500 to run IEEE STP, the problems I was having with ports being blocked disappeared.

Can anyone suggest what is the best approach when running a Cat 500, connected to a Cat 2950 ?

Do I need to enable MST on the Cat 500, so that it can interop with 2950 ?

If I have only thses 2 switches, is the best option just setting both switches to use the same STP mode ?

Thanks

1 ACCEPTED SOLUTION

Accepted Solutions
Blue

Re: Cat Express 500 & 2950 RSTP & PVST

YES,

the best option is to use the same STP type/mode throughout your environment.

rapid-PVST+ is interoperable with PVST+. when the two exist, the rPVST+ switch reverts to PVST+ unless you are running dual STP instances, one for rPVST+ and one for PVST+.

again, if you can run the same STP mode, please do.

please see the following link for much more STP info:

http://www.cisco.com/en/US/tech/tk389/tk621/tsd_technology_support_protocol_home.html

1 REPLY
Blue

Re: Cat Express 500 & 2950 RSTP & PVST

YES,

the best option is to use the same STP type/mode throughout your environment.

rapid-PVST+ is interoperable with PVST+. when the two exist, the rPVST+ switch reverts to PVST+ unless you are running dual STP instances, one for rPVST+ and one for PVST+.

again, if you can run the same STP mode, please do.

please see the following link for much more STP info:

http://www.cisco.com/en/US/tech/tk389/tk621/tsd_technology_support_protocol_home.html

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