BGP anouncing with two peers.

[Damjan]

> 
> 	Please, if you get the answers, could you send me a copy ?

Hello, I've succeded in making Bird BGP work.
I'm now using it to anounce my ISP's ip address pool to the
world, through two peers. Also I prepend the routes I anounce so
part of my IP's are routed through one peer, and the other part
through the other peer. Curently I'm only anouncing (exporting)
BGP routes, I don't import nothing.


Next thing I'll do is try to manipulate my router's two routing
tables when a BGP session is broken, so that I can get automatic
switchover of the uplink too. This will require a different Bird
configuation and I'll do it once I get more familiar with Bird's
scripting language.


This is the configuration I used, atached. If you have any
questions feel free to ask me.



-- 
Damjan Georgievski		|           Дамјан Георгиевски
Skopje, Macedonia		|           Скопје, Македонија
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router id IP.ADDRESS.BGP.ROUTER;
log "/var/log/bird.log" all;
debug protocols all;
debug commands 2;


protocol device {
# This is neceseary for Bird to work at all.
# BTW it's not in the documentation.

    scan time 60;
}

# I have a 1.1.64.0/19 netmask, divided in two subnets
# so that I can route them separately.

protocol static pool1{
    route 1.1.64.0/20 via IP.ADDRESS.BGP.ROUTER;
}

protocol static pool2{
    route 1.1.80.0/20 via IP.ADDRESS.BGP.ROUTER;
}

protocol bgp {
   local as MY_AS;
   source address IP.ADDRESS.BGP.ROUTER;     
   multihop 20 via IP.ADDRESS.BGP.ROUTER;
   neighbor PEER1.IP.ADDRESS as PEER1_AS;
   import none;
   export filter {
       if net ~ [ 1.1.64.0/20+] then {
           bgp_path.prepend(MY_AS); 
           bgp_path.prepend(MY_AS); 
           bgp_path.prepend(MY_AS); 
           accept;
       }
       if net ~ [ 1.1.80.0/20+] then {
           accept;
       }
       reject;
   };
}

protocol bgp {
   local as MY_AS;
   source address IP.ADDRESS.BGP.ROUTER;
   multihop 20 via IP.ADDRESS.BGP.ROUTER;
   neighbor PEER2.IP.ADDRESS as PEER2_AS;
   import none;
   export filter {
       if net ~ [ 1.1.64.0/20+] then {
           accept;
       }
       if net ~ [ 1.1.80.0/20+] then {
           bgp_path.prepend(MY_AS); 
           bgp_path.prepend(MY_AS); 
           bgp_path.prepend(MY_AS); 
           accept;
       }
       reject;
   };
}