Subject: [Idr] 2 simulataenous BGP connections ..

From: Hunju Park <[email-masked]>
Date: Sat, 15 Nov 2003 00:13:47 -0500 (EST)

Hi,

I want to know if its legal to have two simulataneous
connections between two BGP speakers.

 -------            -------
 |      |--- . . -- |     |
 |   A  |--- . . -- |  B  |
 --------           --------

I know of one major vendor that allows that. IMHO this
should not be allowed and BGP should check the ROuter
ID when it receives the OPEN message and should ignore
this if it already has a connection with a router
having the same router ID.

This can also prevent it in situations when one of the
routers in the domain is misconfigured with a wrong
router ID. In full mesh case it can be detected as
this router will not peer with the router having the
same Router ID .. but this can create problems when
you have Router Reflectors/Confederations/etc.

And if somebody is thinking of redundancy then he/she
can use loopback addresses.

Any comments,
Park

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