[98075] in North American Network Operators' Group
Re: Question on Unrecognized BGP Path Attribute
daemon@ATHENA.MIT.EDU (Tony Li)
Tue Jul 24 15:24:04 2007
In-Reply-To: <ea11805f0707231048u3bbcb597u7f0911cf1898ca98@mail.gmail.com>
Cc: nanog@merit.edu
From: Tony Li <tony.li@tony.li>
Date: Tue, 24 Jul 2007 13:27:35 -0500
To: Xin Liu <smilerliu@gmail.com>
Errors-To: owner-nanog@merit.edu
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
