[139190] in North American Network Operators' Group
RE: iBGP usage on a BRAS
daemon@ATHENA.MIT.EDU (Ido Szargel)
Tue Mar 29 08:10:33 2011
From: Ido Szargel <ido@oasis-tech.net>
To: Mike <mike-nanog@tiedyenetworks.com>, NANOG list <nanog@nanog.org>
Date: Tue, 29 Mar 2011 14:08:39 +0200
In-Reply-To: <4D910451.7050909@tiedyenetworks.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Hi Mike,
iBGP is what most ISPs would use for that, for customers with dynamic IPs s=
imply aggregate their addresses on the BRAS, if you have several thousand I=
Ps you really don't want them in your IGP
Regards,
Ido.=20
-----Original Message-----
From: Mike [mailto:mike-nanog@tiedyenetworks.com]=20
Sent: Monday, March 28, 2011 11:58 PM
To: NANOG list
Subject: iBGP usage on a BRAS
Hello,
I have a BRAS (Terminating several thousand PPPoE sessions), and today I u=
se simple static routes pointing to the bras for customer routes. I want to=
improve this model and allow for failover and so forth, and I would like i=
nstead for my customer routes to be entered into my igp so if they move aro=
und, the routes can follow them. I was wondering if iBGP may be sutaible fo=
r this task - there will always be a steady stream of route updates as cust=
omer connect and disconnect, mostly in the range of /32's and /29's. BGP se=
ems way superior to ospf for this because of it's excellent filtering and o=
ther capabilities, but never having done this on a large scale with the pot=
ential for updates as I said, I was hoping someone could make a clear case =
for or against it.
The client routes would not have to be propagated all across my network so=
updates don't really have to go far; I could certainly summarize these rou=
tes easily at a core router 1 hop from my bras for example, with that route=
r(s) knowing the final hop from ibgp. I just want them to be able to float =
between bras and I can even tolerate a few seconds of route instability (he=
y, if you want stability then don't keep redialing; nail the pppoe up and l=
eave it up!)
Thank you Oh wizend ones (!),
Mike-
