BGP Link Bandwidth Extended Community?

Ondrej Zajicek santiago at
Mon Dec 29 14:36:27 CET 2014

On Tue, Dec 23, 2014 at 05:44:01PM -0800, dave seddon wrote:
> Greetings,
> Sorry for the dumb question, but I'm trying to work out how to set the
> extended communities.  Anybody know how to set the Link Bandwidth Extended
> communities?

> Basically, need to set the community to:
> "
>    This document defines a specific application of the two-octet AS
>    specific extended community.  IANA is requested to assign a sub- type
>    value of 0x04 for the link bandwidth extended community.
>       Name                                           Value
>       ----                                           -----
>       non-transitive Link Bandwidth Ext. Community  0x4004
> "
> e.g.
> export filter { bgp_ext_community.add((4, 65300, 999)); accept; };
> ( Mostly stolen from this nice example:
> )


Don't know if you use plain BIRD or one from, but "(4, 65300,
999)" is an invalid syntax. you should use: "(unknown 0x4004, 65300, 999)",
which works for me (not tested in tcpdump, but at least i got the same
back in show route).

Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3,
"To err is human -- to blame it on a computer is even more so."
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