Pedantry perhaps, but I think you mean "routes" and not "UPDATEs". No implementation should literally be dropping UPDATE messages under any circumstances (well, unless it closes the session then). For that matter, they shouldn't be dropping routes (in the sense of discarding them unprocessed), so I think you mean "filtered by policy" and not "dropped".
£0.02, --John > On Mar 20, 2018, at 1:52 PM, Job Snijders <j...@ntt.net> wrote: > > Hi all, > > Reudiger Volk mentioned something interesting at the microphone > yesterday about getting more visiblity into BGP UPDATES that are > rejected/dropped somewhere in the policy chain transitioning from > Adj-RIB-In to Loc-RIB. > > To make a crude route-map example: > > ip prefix-list allow-ebgp-in permit 192.0.2.0/24 > ! > route-map ebgp-in permit 10 > match ip address prefix-list allow-ebgp-in > ! > route-map ebgp-in deny 20 > bmp-log-code 21438 > > It would be great to see what UPDATEs get dropped in "route-map ebgp-in deny > 20". > It would perhaps be quite useful if we can get to the point where you > can even attach custom policy-exit codes to the "Dropped Updates" send > in this new BMP feed. I can see how this makes operational life easier. > > RFC 4271 Section 9.1: "The Decision Process selects routes for > subsequent advertisement by applying the policies in the local > Policy Information Base (PIB) to the routes stored in its > Adj-RIBs-In. The output of the Decision Process is the set of > routes that will be advertised to peers; the selected routes will be > stored in the local speaker's Adj-RIBs-Out, according to policy." > > Perhaps a series of BMP "PIB" drafts are in order? > > Is this worthy of a new BMP draft? Are there volunteers? > > Kind regards, > > Job > > _______________________________________________ > GROW mailing list > GROW@ietf.org > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.ietf.org_mailman_listinfo_grow&d=DwICAg&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=hLt5iDJpw7ukqICc0hoT7A&m=sDs-eutrXrd8oD5o2L4-hgQq8DGzPAt5gosqFOcsk18&s=XDz9VZoMEh4fZP-HmZroeFV27-iRnvtsLb9SEhfGLfw&e= _______________________________________________ GROW mailing list GROW@ietf.org https://www.ietf.org/mailman/listinfo/grow
