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How and when to use bgp community-list?

Hi All,

I saw some bgp sample use community-list for route filtering in BGP. I had found some resource but I still can not understand it. I saw some community-list like: ip community-list 5 permit 10:20. What's the "10:20" means?? Can anybody give me a hand? Thank you!

Best Regards

Teru Lei

1 REPLY
Silver

Re: How and when to use bgp community-list?

A community can be expressed in either decimal format (32 bit value), hexidecimal value or as an AS:Value, this last syntax required the use of the command ip bgp-community new-format. This is the syntax you are refering to,

the 10 should represent the AS number and the 20 the community value.

RFC1998 gives a general overview of how these communites are used by ISP's:

ftp://ftp.rfc-editor.org/in-notes/rfc1998.txt

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