[routing-wg] May a tier1 transit change bgp origin attribute?
Job Snijders job.snijders at hibernianetworks.com
Fri Dec 13 21:08:49 CET 2013
On Fri, Dec 13, 2013 at 08:31:39PM +0100, Harald Michl wrote: > We (ACOnet, the Austrian NREN, AS1853) do have several upstreams. More > or less per random we detected that one of them delivers prefixes with a > different route origin parameter (IGP instead of incomplete) than > others. This obviously has a big influence in the BGP best-path > selection. After asking why this is the case we learned from them: > > On 28.11.13 10:32, support at xxx.com wrote:> > > Hi Harald, > > > > The XXX standard route map sets origin IGP as standard across all > > customer learned routes... > > Now we are currently debating with them whether this is ok or not. For me the igp attribute falls in same category as MED. If your routing policy is not to accept MEDs (thus rewriting them), you should for consistency purposes, also reset route origin attribute. It is likely your upstream is resetting the origin to draw more traffic towards themselves. To level the playing field in your case, it might be beneficial to reset origin on outbound advertisement across all your upstreams. Kind regards, Job -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 873 bytes Desc: not available URL: <https://lists.ripe.net/ripe/mail/archives/routing-wg/attachments/20131213/c4dfca79/attachment.sig>