Posted on 2002-05-20
we have a multihomed bgp environment with our own AS.
We have been given a /24 ip address range (which we have subnetted to use 4 subnets /26 - using the
all zero and all ones subnet)
Given that we have our own AS number and IP address range, is the AS number linked with our ip address
range? is this linked solely with the "network" command in BGP config?
see configuration below:
router bgp x
neighbor x.x.x.x remote-as 702
neighbor x.x.x.x description UUnet s2/1
neighbor x.x.x.x filter-list 1 out
neighbor y.y.y.y remote-as 5378
neighbor y.y.y.y description C&W s2/0
neighbor y.y.y.y filter-list 1 out
so whatever we put in for the network a.a.a.0
ie network a.a.a.0 is important, as this will be advertised out to other BGP As'es, for instance if
I changed this to another ip address range would this cause carnage on the internet? (not that i would!
our isps trusts us!)
We have been using neigbour y.y.y.y for 2 months. We added neigbour x.x.x.x today. How long would it
take for other BGP routers to have x.x.x.x listed as a alternative AS path (via AS 702)?? to our a.a.a.0
network address range?
Would it be possible for us to be a transit AS... i know that this is a bad idea.. but how is it configured?