BGP Query plz help

shaila_rox · ‎02-16-2007

hi guys, i have a very basic scenario of BGP load balancing

router A serial 0 to router B Serial 0

router A serial 1 to router B serial 1

Now i have configured loopback interfaces on both routers to be used for update-source command, i m not going into their detail, wat i want to ask is that in this case BGP updates will be send via both links ( load balancing) is there a possible way that i may force BGP to use serial 0 as a primary link and use s 1 only if s 0 fails ???

i know abt the backup interface command so is there any other way to do it ???? plz tell

thanks in advance

CSCO10892433 · ‎02-16-2007

Hi, shaila

Yes, there is a way you can do this.

On router A, create two static routes as follows

ip route loopback-address-of-B mask serial0

ip route loopback-address-of-B mask serial1 210

On router B, you do the same thing

ip route loopback-address-of-A mask serial0

ip route loopback-address-of-A mask serial1 210

The route to the neighbor's loopback address will go onto serial0(and hence, the BGP updates will go onto serial0 only) . Once the serial0 goes down, it will turn to serial1.

HTH

SSLIN

shaila_rox · ‎02-16-2007

Thank u very much, something was clicking in my head tht i know lol, but again thank u very much

purohit_810 · ‎02-16-2007

Hi Shaila,

See we can do also by that way.... if you are pointing loopback to nexp hop router... it will get AD - 1

and pointing to local interface it will get AD-0. Okie

So, point to Serial-1 with nexp hop ip address. and serial-0 as it is.

Regards,

Dharmesh

shaila_rox · ‎02-16-2007

thanks for ur feedback, at first i really got confused how to do it, thanks to u guys thanks alot