Won't it be backslash rather than forward slash? _([0-9]+) _\1_\1_\1_
On Mon, Aug 19, 2013 at 9:51 AM, Randy <randy_94...@yahoo.com> wrote: > 11 prepends is beyond-excessive besides being annoying. > filter please _([0-9]+) _/1_/1_/1_ > > > > > >________________________________ > > From: Blake Dunlap <iki...@gmail.com> > >To: Christopher Karel <chris.ka...@gmail.com> > >Cc: "nanog@nanog.org" <nanog@nanog.org> > >Sent: Sunday, August 18, 2013 7:42 PM > >Subject: Re: BGP Route Issues > > > > > >Local Pref (which is common by the way to be set so customers > peers > > >transit). AS Path doesn't beat it. > >You can only request people follow the routes you want ingress, there's > >nothing you can do to force them to take a path to you short of > >deaggregation, and that only works until they notice it, and it irratates > >the rest of the world as well by using additional route slots. > > > >Poor routing is purely a viewpoint problem, not necessarily in agreement > >between all parties. > > > >-Blake > > > > > >On Sun, Aug 18, 2013 at 8:33 PM, Christopher Karel <chris.ka...@gmail.com > >wrote: > > > >> Good evening, > >> > >> I'm hoping you guys might be able to offer some advice or insight > into > >> a BGP problem I've got. I've noticed some strange routes between our > >> network, AS27270, and AS22943. It looks like both our networks are dual > >> homed. One ISP as the primary, and the other used as a backup, with > path > >> prepending to prevent it from actually being used except in an outage. > >> However, our route to 22943 appears to be using their backup link. > (27270 > >> 4323 7018 22943 22943 22943 22943 22943 22943 22943 22943 22943 22943 > >> 22943) Which is strange, because we can reach their primary ISP without > >> any such rigmarole. > >> > >> Playing around with Looking Glass servers indicates that Cogent > >> (AS174) has a similar backup route to our network. (174 22402 27270 > 27270 > >> 27270 27270 27270 27270) Everywhere else I check seems perfectly sane. > >> But since Cogent is essentially in-between the two networks I'm > >> troubleshooting, I would assume that the other network has a similar > route. > >> But Cogent won't talk with me about this, since I'm not a customer. > >> > >> So as far as advice goes, is there a common issue that might result > in > >> such poor routes in both directions? Any further troubleshooting that I > >> should be doing? Or any ideas on how to help remedy things that appear > to > >> be outside our network/ISP? Or are we doing something so wrong that > this > >> is all my fault? > >> > >> I'd really appreciate any input on this. > >> > >> > > > > > > >
