Extended Community List Overview

The router supports the BGP extended community attribute defined in Internet draft BGP Extended Communities Attribute—draft-ietf-idr-bgp-ext-communities-07.txt (February 2004 expiration). This attribute enables the definition of a type of IP extended community and extended community list unrelated to the community list that uses regular expressions.

Note: IETF drafts are valid for only six months from the date of issuance. They must be considered as works in progress. For the latest drafts, please see the IETF website at http://www.ietf.org.

A BGP device can append the extended community attribute to a route that does not have the attribute before it advertises the route. For routes that do have the attribute, BGP can modify the attribute.

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