Re: BGP anouncing with two peers.

26 Nov 2001

      Damjan <gdamjan@mail.net.mk> writes:
...
Hello all,
I want to setup BIRD to anounce BGP routes for my AS. 
We have two backbone providers so I'll need to make two BGP
connections. I only need to anounce routes and don't want to
import them. I also want on the second BGP conection to prepend
our AS several times, so this route should be less prefered.
I have worked out a draft bird configuratioan, but some things
are unclear to me.
## bird.conf ##
protocol bgp one {
        local as 65333; # our AS (let say it is)
        neighbor peer.two.ip as [theiras];  # peer two and their AS
        multihop 20 via my.next.hop.ip;   # not directly connected  
        import none;
        export ;      # Same thing as above, but prepend our AS
                      # several times, so this route is less
                      # prefered
source address x.y.z.w; # The IP address of my router
}
protocol bgp one {
      local as 65333; # our AS (let say it is)
      neighbor peer.two.ip as [theiras];  # peer two and their AS
      multihop 20 via my.next.hop.ip;   # not directly connected  
      import none;
      export ;      # Same thing as above, but prepend our AS
                    # several times, so this route is less
                    # prefered
source address x.y.z.w; # The IP address of my router
}
Are you sure you want to run two BGP processes? Not just one process
with two peers? 

protocol bgp one {
         local as 65333; # our AS (let say it is)
         neighbor peer.one.ip as [theiras];  # peer one and their AS
         multihop 20 via my.next.hop.ip;   # not directly connected  
         neighbor peer.two.ip as [theiras2];
         mutlihop 20 via my.next.hop.ip;
         import none;
         export filter {
                if bgp_next_hop = peer.two.ip then {
                        bgp_path.prepend(65333);
                        bgp_path.prepend(65333);
                        bgp_path.prepend(65333);
                }
                accept;
        };
         source address x.y.z.w; # The IP address of my router
}

Without any warranty :-) I have never configured BGP.

-- 
-------------------------------------------------------------------------
David Rohleder						davro@ics.muni.cz
Institute of Computer Science, Masaryk University
Brno, Czech Republic
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