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Spanning Tree Root bridge priority

All,

Regarding root bridge priority, our current catalyst 4510 switch 1 is the root for all VLANs from 1-205. I need to pull all the even numbered vlans from core 1 and make core switch 2 the root priority for all the even numbered vlans. I know that there will be spanning tree convergence in doing so for all the even numbered vlans, but will there be any effect on the odd-number vlans in core1? any info would be appreciated.

2 ACCEPTED SOLUTIONS

Accepted Solutions
Hall of Fame Super Blue

Re: Spanning Tree Root bridge priority

vpollifrone wrote:

All,

Regarding root bridge priority, our current catalyst 4510 switch 1 is the root for all VLANs from 1-205. I need to pull all the even numbered vlans from core 1 and make core switch 2 the root priority for all the even numbered vlans. I know that there will be spanning tree convergence in doing so for all the even numbered vlans, but will there be any effect on the odd-number vlans in core1? any info would be appreciated.

No there shouldn't be but i would still do this out of hours and tell the company that will be a short outage on the network.

Jon

Re: Spanning Tree Root bridge priority

I totally agree with Jon.. when changing the root bridge for even VLANs, the upstream switch will not have any topology changes for odd vlans, since the root switch will continue acting the root for end users.. There will not be any TCN's generated during this time, but just to be safe, its better to take a downtime notifying a very small disruption ! better to be safe than sorry : )

Jon - congrats on your "hall of fame" 

Raj

3 REPLIES
Hall of Fame Super Blue

Re: Spanning Tree Root bridge priority

vpollifrone wrote:

All,

Regarding root bridge priority, our current catalyst 4510 switch 1 is the root for all VLANs from 1-205. I need to pull all the even numbered vlans from core 1 and make core switch 2 the root priority for all the even numbered vlans. I know that there will be spanning tree convergence in doing so for all the even numbered vlans, but will there be any effect on the odd-number vlans in core1? any info would be appreciated.

No there shouldn't be but i would still do this out of hours and tell the company that will be a short outage on the network.

Jon

Re: Spanning Tree Root bridge priority

I totally agree with Jon.. when changing the root bridge for even VLANs, the upstream switch will not have any topology changes for odd vlans, since the root switch will continue acting the root for end users.. There will not be any TCN's generated during this time, but just to be safe, its better to take a downtime notifying a very small disruption ! better to be safe than sorry : )

Jon - congrats on your "hall of fame" 

Raj

Hall of Fame Super Blue

Re: Spanning Tree Root bridge priority

Raj

Thanks. Can't speak for the others but my place is due mainly to persistence ie. you post enough answers you get a lot of points

Jon

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