BGP export connected or static prefixes

[Ondrej Filip]

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On 6.3.2015 17:53, Anand Buddhdev wrote:
> Dear BIRD users,
> 
> I'm setting up BIRD 1.4.5 as a router for an AS112 anycast
> instance. I've got the router running and creating peering
> sessions with peers, and also importing prefixes from them into
> the kernel.
> 
> However, it's not exporting my prefix, and I'm afraid I don't
> understand why. I'm quite new to BIRD, so please bear with me if
> my question looks naive. I would appreciate any clues.

Dear Anand,
the problem is caused by the fact that device routes are handled
differently than the others. Protocol 'kernel' ignores those routes
and they are generated by protocol 'direct'. And this routing
protocol is connected to routing table 'master' in you example. So
this route is not in routing table 'anycast'. You should see it byt
'show route table master' and not 'show route table anycast'. There
are more ways how to fix this:

1) Use only routing table 'master'. Is there a reason for using
special routing table in this case?

2) Generate this routing in routing table 'anycast'
a) You can either attach protocol 'direct' to table 'anycast':
protocol direct {
  interface "dummy0*";
  table anycast;
}

b) Or you can export this route using protocol 'pipe'
protocol pipe {                         # The Pipe
	table master;
	peer table anycast;
	export filter as112;
};

c) Or you can generate it using protocol 'static':
protocol static {
	route 192.75.48.0/24 via "dummy0";
	table anycast;
};

There is even more ways of course. But I hope this is gonna help you.

		Ondrej



> 
> My configuration looks like this:
> 
> list bgp address <myaddr>; router id <myaddr>; tabe anycast;
> 
> filter as112 { if net = 192.75.48.0/24 then accept; reject; }
> 
> protocol direct { interface "dummy0*"; }
> 
> protocol device { }
> 
> protocol kernel { export all; kernel table 10; table anycast; }
> 
> protocol bgp { export filter as112; local <myaddr> as 112; 
> neighbor <peeraddr> as <peeras>; table anycast; }
> 

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