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Root bridges with priority of zero

When a bridge with a priority of 0 comes online, I want him to take over as root from an existing root bridge that also has a priority of zero. Assuming that the new bridge has a higher mac address, how can I make this happen.

4 REPLIES

Re: Root bridges with priority of zero

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center (http://www.cisco.com/tac) or speak with a TAC engineer. You can open a TAC case online at http://www.cisco.com/tac/caseopen

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

Cisco Employee

Re: Root bridges with priority of zero

The MAC address used for the Bridge ID is being taken from a fixed pool of MAC addresses existing on the switch. You cannot modify them. The only way to make sure one particular switch becomes the root is being making sure it has the lowest bridge priority.

New Member

Re: Root bridges with priority of zero

Thanks for the reply.

The CCIE test states that both bridges have the same lowest priority, but the one with the higher mac address MUST becomes root; perhaps there is a special command?

Cisco Employee

Re: Root bridges with priority of zero

There is no way to change the MAC address used in the Bridge ID. You can only play with the bridge priority to select which one will be the root.

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