iBGP usage on a BRAS

Mike mike-nanog at tiedyenetworks.com
Mon Mar 28 16:57:37 CDT 2011


Hello,

	I have a BRAS (Terminating several thousand PPPoE sessions), and today 
I use 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 instead for my customer routes to be entered into my igp so 
if they move around, the routes can follow them. I was wondering if iBGP 
may be sutaible for this task - there will always be a steady stream of 
route updates as customer connect and disconnect, mostly in the range of 
/32's and /29's. BGP seems way superior to ospf for this because of it's 
excellent filtering and other capabilities, but never having done this 
on a large scale with the potential 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 routes easily at a core router 1 hop from my bras for example, 
with that router(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 (hey, if you want stability then don't keep redialing; 
nail the pppoe up and leave it up!)

Thank you Oh wizend ones (!),


Mike-




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