On Tue, Apr 19, 2022 at 12:45:29AM -0700, gautham devalapalli wrote: > Hello, > > I am using BIRD 2.0.8 to establish a bgp session with a nexus switch. I am > trying to set bgp ext community link bandwidth. Since this is not > explicitly supported I am following the thread below to set it as unknown. > > https://marc.info/?l=bird-users&m=142108436602254&w=2 > > I tried setting > *bgp_ext_community.add((unknown 0x4004,65000,1000));* > > *and * > *bgp_ext_community.add((unknown 0x4004, 65000, 0x447a0000));* > > https://datatracker.ietf.org/doc/html/draft-ietf-idr-link-bandwidth-07#section-2 > > *bird bgp config:* > protocol bgp ebgp_node01 { > local 10.0.10.3 as 65000; > neighbor 10.0.10.1 as 100;
> On wireshark I see the bird does not send this ext community as part of the > bgp UPDATE message. The link bandwidth extended community is non-transitive. From the draft you linked: The extended community is optional non-transitive. The value of the high-order octet of the extended Type Field is 0x40. That means it is not propagated through EBGP, only through IBGP. Different ASNs -> EBGP (unless configured as AS confederation). -- Elen sila lumenn' omentielvo Ondrej 'Santiago' Zajicek (email: santi...@crfreenet.org) OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net) "To err is human -- to blame it on a computer is even more so."
