[55481] in North American Network Operators' Group
Re: routing between provider edge and CPE routers
daemon@ATHENA.MIT.EDU (Serge Maskalik)
Wed Jan 29 14:59:21 2003
Date: Wed, 29 Jan 2003 19:53:23 +0000
From: Serge Maskalik <serge@netvmg.com>
To: Mike Bernico <mbernico@illinois.net>
Cc: nanog@merit.edu
In-Reply-To: <7CD4CD9D537C294D9ED9E5CE2F019106B6BC4A@MAILSERV.linc2icn.net>; from mbernico@illinois.net on Wed, Jan 29, 2003 at 12:51:08PM -0600
Errors-To: owner-nanog-outgoing@merit.edu
My recommendation would be for you to:
o redistribute directly connected interfaces via a strict
filter into BGP and use iBGP to carry it around the local
AS
or
o use passive interfaces in IGPs to do the same
Avoid having to run a topology computation everytime a T1/56k
links drops. I prefer the first option to the second based on
experience UUNET / Global Crossing has w/ option #1.
- Serge
Thus spake Mike Bernico (mbernico@illinois.net):
>
>
> Hi,
>
> I apologize if this has been asked before. I work for an ISP that
> started very small (hundreds of T1 and 56k customers) and has grown very
> large in the last few years (thousands of T1 customers, as well as DS3
> customers and OC3 customers).
>
> We currently use an IGP to route between our distribution routers and
> the CPE routers we manage. This has historically worked very well. We
> have recently begun running into scalability issues however. We have
> some distribution routers that have over 1000 T1 interfaces on them.
> This is causing some problems with stability in that edge IGP. Does any
> other service provider use an IGP all the way to the customer for non
> BGP customers or are we the only one? I have a feeling we maybe are.
>
> If you do use an IGP, have you had any of the scalability issues we have
> had? How did you fix them?
>
> If you use statics/BGP to CPE routers have you had any issues doing
> that? In particular I'm wondering about the thousands of lines of
> configuration used to make static routes work.
>
>
> Thanks in advance for your advice.
>
> Mike Bernico
