[isp-bgp] Re: Routing Information

["E.B. Dreger" <eddy+public+spam@...>]

SP> Date: Sun, 29 Feb 2004 12:38:16 -0500
SP> From: Serge Paquin


SP> When using IBGP internally is it typical to use internal
SP> AS#'s for the internal routers/switches or do you use them
SP> all with your AS# and the next-hop parameter?

Both work.  I like setting up confederations from the start, even
if they aren't initially needed, so I tend to use internal ASNs.


SP> I'm thinking that it may be wise for me to have my Layer3
SP> Switch advertise my address blocks to my routers.  That way
SP> the routers will advertise to each other also.

No they won't.  iBGP doesn't redistribute, because it has no
means of loop detection.

As for IGP, that's a whole topic of its own.  You want to carry
as little as possible in your IGP (OSPF, IS-IS, etc.) for fast
convergence.  You want to avoid redistributing routes whenever
possible.  You want to use "no synchronization" on BGP if you
can.


Eddy
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