Qwest uses 80 for peers; 100 for customers. As I'm sure Qwest had AT&T as a peer prior to today (and you tagged as a customer), it probably should have been 80 since the beginning. What was the local pref to AT&T before? Maybe they found a misconfiguration on a router.
If your only objective is to make your Qwest peering "backup", send community 209:70 to Qwest and it'll drop your local pref on their network to 70. This will cause their 80 local pref peering with AT&T to be preferred. I also suggest you read: http://www.onesc.net/communities/as209/ and http://www.onesc.net/communities/as7018/ However, depending on if your network topology and situational circumstances permit it, it may not be a bad idea to take on-net customer routes for performance reasons. On Sat, Aug 6, 2011 at 8:51 PM, Graham Wooden <gra...@g-rock.net> wrote: > Hi folks, > > Anyone else noticed a localpref change on Qwest network in regards to AT&T > prefixes? I noticed my AT&T assigned prefixes dropping to 80, causing my > backup transit peering with Centurylink to take preference with Qwest > originators ... All was working fine with my prepends .. But not > anymore... > > Any insight would be great. I haven¹t reached out to AT&T or Qwest yet. > Curious if this is a bigger change than just me. > > Thanks, > > -graham >
