ROOT Bridge identification

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Nov 6th, 2007
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I am very perplexed by one CCNA question, this is a simulation. The simulation allows you to console into one switch and asks what bridge is the root bridge, how do you tell?

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Edison Ortiz Tue, 11/06/2007 - 20:51
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show spanning-tree should provide that info.

bvsnarayana03 Wed, 11/07/2007 - 02:56
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boy, spanning tree is too fundu for ccna. Even understanding VTP is a tough time at ccna level, bcoz many people who appear for ccna are not experienced or have hands-on over devices. But they are taking a chance, hoping to get a profile where they get to work on these devices.

however, heres the command:

show spanning-tree

The output shows Root bridge MAC & priority, as well as self MAC & priority. If both are same, then that switch itself is the root bridge. otherwise "sh arp" can give u a corresponding Ip add of root switch against rootbridge mac add.

nikonpledge1234 Wed, 11/07/2007 - 06:22
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Thank you I hope that they remove this simulation from the 640-802 test.


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