Hi Muhammad,
I am afraid I cannot find any attached Cisco documentation.
But I will try and answer your question.
IBGP speakers need to be full meshed to prevent routing loops that
could occur from a "distance vector routing protocol" like behaviour.
By having a full mesh, an IBGP peer gets first hand information from
every other IBGP peer thus eliminating possibility of routing loops.
Ofcourse, this could cause scaling problems for a large no. if
IBGP peers. But there are a couple of solutions to prevent such
problems.
o Router Reflectors. (rfc1966)
o Confederations. (rfc1965)
Hope this helps,
Thanks,
Nalin
Muhammad Asif Rashid wrote:
>
> Would someone be so kind as to explain why BGP speakers within a common =
> AS=20
> need to be fully meshed please.
>
> I am reading some Cisco documentation that is attached to this message.
>
> The paragraphs in red are what is not quite clear to me.
>
> Thanks a lot.
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