Re: Route aggregation in BIRD - how?

[dspazman at epicup.com]

Isn't there a case when you DON'T want the links aggregated?  If you have servers in 2 different data centers, both announcing a 1.1.1.1/20, but one also announces 1.1.1.1/22, and the other also announces 1.1.5.1/22, so the one data center tends to serve 1.1.1.1-1.1.4.255, and the other data center tends to serve 1.1.5.1-1.1.8.255, but if either data center goes down, the whole address range will be served by the other data center?
 
I don't have this setup, but was considering it at some point.
 
More of a curiosity question.
 
 
-----Original Message-----
From: "Alexander V. Chernikov" <melifaro at yandex-team.ru>
Sent: Monday, January 23, 2012 11:14am
To: "Maciej Wierzbicki" <voovoos-bird at killfile.pl>
Cc: bird-users at network.cz
Subject: Re: Route aggregation in BIRD - how?



On 23.01.2012 20:01, Maciej Wierzbicki wrote:
> Hello.
>
> Case study:
> * importing full BGP table from various uplinks
> * some routes received by BGP are being exported via OSPF to core1,
> using filters:
> (source = RTS_BGP && bgp_path ~ [= * ASNXYZ * =])
>
> Question: how to aggregate routes (whenever possible) before exporting
> them via OSPF to core?

It is not possible currently.

I'm working on BGP route aggregation and I plan to get more or less 
working code at the end of this week.

>
> Example: lets say that I've received a.b.c.d/22 and a.b.c.d/24 from
> asnXYZ via BGP. Lets say that I want to export routes with asnXYZ in
> aspath via ospf to core1 switch. Obviously, a.b.c.d/24 is in a.b.c.d/22,
> so I would like to export only a.b.c.d/22. Is it doable in bird? If yes,
> any hint/keywords in doc?
>

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