why do we need extended system id

Answered Question
Aug 19th, 2012
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Hi everybody


I understand what is extended system id is but i am at loss as to why we need it. I tried to find some material on Google but could not get a straight answer as to why we need it.



thanks

Correct Answer by Reza Sharifi about 4 years 12 months ago

Hi Sarah,


Extended system id is used to make every bridge id unique

Have a look at the config guide for details:


http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/spantree.html#wp1037363


HTH

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sarahr202 Sun, 08/19/2012 - 20:21
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Thanks. Reza

Do all cisco switches either have 64 mac or 1024 mac not in between ?

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