Command Syntax for BIRD configuration
santiago at crfreenet.org
Mon Jan 25 11:14:04 CET 2010
On Mon, Jan 25, 2010 at 05:19:09PM +0800, Affandi INDRAJI wrote:
> Hi Ondrej,
> Thanks for prompt reply.
> A couple of question:
> 1. How to configure based on match AS for example in cisco, they have
> regular expression like _7898$, what is the equivalent of this command
> in BIRD config file (do you use the same regular expression syntax)?
You can use generalized pattern matching expressions like:
bgp_path ~ [= * 1234 * =]
(that matches any path containing 1234, see  section bgpmask for details).
or faster first/last expressions like:
bgp_path.first = 1234
bgp_path.last = 1234
that checks first/last ASN in the AS path.
These expressions can be used in import/export filters (in 'if' expressions)
and can be also used in 'show route' commands to filter routes to show:
show route where bgp_path ~ [= * 1234 * =]
> 2. I managed to set the community to let say 1000:1234, how to put it
> in the filter to match this community (let say, we want to advertise to
> certain peer only the routes that match community 1000:1234)
The expression is:
(1000,1234) ~ bgp_community
Elen sila lumenn' omentielvo
Ondrej 'SanTiago' Zajicek (email: santiago at 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."
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