Re: Question on Unrecognized BGP Path Attribute

On Jul 23, 2007, at 12:48 PM, Xin Liu wrote:

I have a question about unrecognized BGP path attribute. According to RFC4271, when a BGP router sees an UPDATE with an unrecognized optional and transitive path attribute, it should retain the attribute, and if the path is selected, it should propagate the attribute to its neighbors. My question is, if later the router sees an update to the path in which only the unrecognized attribute has changed, should it immediately propagate the change to its neighbors? My guess is a yes, but I'm not sure because it's not explicitly written down in the RFC.

Yes, that was the intent. A better place for this might be the IETF's IDR mailing list. Tony