From: kevin gannon (kevin@gannons.net)
Date: Thu Sep 22 2005 - 11:52:41 GMT-3
Maybe a concern is flapping links which only historically BGP could
protect against. With "ip dampening" this is less of an issue.
Regards
Kevin
On 9/22/05, Schulz, Dave <DSchulz@dpsciences.com> wrote:
> I would assume that this is the Stock Exchange, that fast convergence may be
> the best selling point to look at. Speed/time is money in the stock world.
>
> Dave
>
> -----Original Message-----
> From: nobody@groupstudy.com
> To: 'Group Study'
> Sent: 9/22/2005 5:48 AM
> Subject: ibgp w/o IGP - How bad?
>
> 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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