From: Ryan (ryan95842@gmail.com)
Date: Thu Aug 23 2007 - 12:59:14 ART
I run OSPF in our network. It's a small network as most ISP's are.
Larger providers like regional or national carriers usually run IS-IS
as there networks are huge.
Since not all the devices in our network can support full BGP routes,
I only run BGP on routers that can and I use a default route at each
edge routers to "draw the traffic" toward the BGP speakers where it
can then be forwarded or dropped if a BGP route is there or not. Edge
routers use next-hop-self so I don't advertise the upstream providers
network into mine (remember those defaults? don't want them there if
the peer is down). Lots of route reflectors and will soon be moving to
a confederation as the network expands.
Best book on the subject (IMO) is: BGP Design and Implementation (ciscopress)
HTH
-Ryan
On 8/23/07, Gregory Gombas <ggombas@gmail.com> wrote:
> For those of you with ISP experience, can you tell me what routing
> protocols do service providers typicall run within their AS?
>
> Do you have every single router running BGP? I can't imagine
> redistributing 225k+
> routes into an IGP, so how do you pass these routes withing your AS?
>
> If you are using iBGP what are you using to transmit next hop
> information (as iBGP does not normally update the next hop of the
> external AS)?
>
> Can someone point me to some documentation showing typical ISP routing design?
>
> Thanks,
> Greg
>
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