From: Tim (ccie2be@nyc.rr.com)
Date: Thu Sep 22 2005 - 06:48:01 GMT-3
Hi guys,
My client, a very well known Stock Exchange, is planning to re-engineer his
network.
The new network design calls for using iBGP between 4 fully meshed peers,
without any IGP.
Being a Stock Exchange, extreme reliability is paramount.
So far, I haven't been able to convince this client that this plan is not a
good idea.
I've given this client several reasons why this is not a good idea but to no
avail.
Maybe I'm missing the most important and compelling reasons not to do this.
I've told him that iBGP wasn't designed to be used in place of an IGP
because BGP's loop avoidance mechanism is based on the list of AS's within
the path attribute; within an iBGP mesh, there's no loop avoidance
mechanism.
I also told him that should any neighbor peering go down that
re-establishing that peering will be very slow (relative to IGP's).
IMHO, there are other very poor design choices, for example, a whole bunch
of static routes are being redist into bgp on one side of the iBGP "cloud"
and then being redist into RIP on the other side.
Besides the reasons I've already stated, are there any other MORE important
reasons this is a poor network design?
This design was tested and it does work but I'm concerned that any problem -
no matter how small - will cause the whole network to crash.
What do you guys think?
Tim
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