Re: bird.conf before going into Production

26 Mar 2011

      On 26.3.2011 20:44, info@naucum.net wrote:
...
Dear Bird Users.
Just wanted to know if that is a working bird config and 1 more question.
Scenario:
I have an AS and 2x /24 (lets say 193.1.1.1 and 194.1.1.1) networks
assigned to my as. Furthermore I have 2 uplink providers. AS1 and AS2.
I want most of the traffic to go thru AS1. AS2 should act as backup
uplink. My as is defined here as AS0.
I believe you config is almost OK.
...
---begin---
router id 193.1.1.1;
log "/var/pfad/bird.log
protocol device { scan time 60;}
protocol static static_bgp {
        import all;
route 193.1.1.0/24 unreachable;
        route 194.1.1.0/24 unreachable;
<======= missing '}'
...
protocol kernel{
  import all;
  export all;
      	}
######################
#     FILERS DEF     #
######################
filter bgp_IN {
if (net ~ [ 169.254.0.0/16+, 172.16.0.0/12+,
             192.168.0.0/16+, 10.0.0.0/8+,
             224.0.0.0/4+, 240.0.0.0/4+,
             0.0.0.0/32-, 0.0.0.0/0{31,32}, 0.0.0.0/0{0,7} ];) then reject;
accept;
}
filter bgp_OUT {
  if (net ~ [193.1.1.0/24, 194.1.1.0/24]) then accept;
  else reject;
}
filter bgp_OUT_P {
  if (net ~ [193.1.1.0/24, 194.1.1.0/24]) then {
  bgp_path.prepend(0);   ---> My AS#
  bgp_path.prepend(0);
  bgp_path.prepend(0);
  accept; }
  else reject;
}
######################
# /    FILERS DEF    #
######################
######################
#    BGP CONF        #
######################
protocol bgp THRU_AS1 {
  local as 0;
  source adress 193.1.1.1;
  neighbor 1.1.1.2 as 1;
  default bgp_local_pref 100;
  path metric 0;
  default bgp_med 1;
  import filter bgp_IN;
  export filter bgp_OUT;
}
protocol bgp THRU_AS2 {
  local as 0;
  source adress 193.1.1.1;
  neighbour 2.2.2.3 as 2;
  default bgp_local_pref 200;
  path metric 0;
  default bgp_med 1;
  import filter bgp_IN;
  export filter bgp_OUT_P;
}
---END of conf.---
Would this work?
I hope so. I don't think these lines are necessary:

 	default bgp_local_pref 100;
 	path metric 0;
 	default bgp_med 1;
...
Can someone show me how I could act as uplink for someone else?
I believe this addition/modification should do the job. Client's
network is C.C.C/24 and his/her IP is X.X.X.X etc.

protocol bgp CLIENT {
	local as 0;
	source adress A.A.A.A;
	neighbour X.X.X.X as 7;
	import filter CLIENT_IN;
	export filter CLIENT_OUT;
}

filter CLIENT_OUT {
	if source = RTS_BGP then accept;
	if (net ~ [193.1.1.0/24, 194.1.1.0/24]) then accept;
	reject;
};

filter CLIENT_IN {
 	if (net ~ [ C.C.C.0/24 ]) then accept;
 	else reject;
}

filter bgp_OUT_P {
 	if (net ~ [193.1.1.0/24, 194.1.1.0/24, C.C.C.0/24] ) then {
 	bgp_path.prepend(0);   ---> My AS#
 	bgp_path.prepend(0);
 	bgp_path.prepend(0);
 	accept; }
	else reject;
}

filter bgp_OUT {
 	if (net ~ [193.1.1.0/24, 194.1.1.0/24, C.C.C.0/24 ]) then accept;
 	else reject;
}

		Ondrej
...
What would I need to add in the config so AS7 is connected to my as and
wants an uplink from me with full routing table ?
Cheers in advanced,
Victor

Re: bird.conf before going into Production

Ondrej Filip