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List:       bird-users
Subject:    RE: Command Syntax for BIRD configuration
From:       Affandi INDRAJI <affandi.indraji () ap ! equinix ! com>
Date:       2010-01-26 1:24:24
Message-ID: 40EF7E7BBAEE1845B7C035B3E38AAFC10A10129F () rso-exchange1 ! ap ! win ! equinix ! com
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Hi Ondrej,

Thanks a lot for your explanation.

Regards,
Affandi Indraji

-----Original Message-----
From: Ondrej Zajicek [mailto:santiago@crfreenet.org]
Sent: Monday, January 25, 2010 6:14 PM
To: Affandi INDRAJI
Cc: bird-users@network.cz
Subject: Re: Command Syntax for BIRD configuration

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 [1] 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 * =]

[1] http://bird.network.cz/?get_doc&f=bird-5.html

> 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@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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