From: John Conzone (jkconzone@xxxxxxxx)
Date: Fri Apr 14 2000 - 17:37:01 GMT-3
Cliff, when you talk about BGP synchronization, it means that BGP will
check your IGP for routes to other AS's. If it doesn't find it, it drops the
advertisement.
No sync turns off the "find it in the IGP" algorithm, and allows BGP to
advertise routes to other AS's not known to the IGP.
This is normal operation of BGP.
----- Original Message -----
From: Cliff Webster <cliff@dcjob.com>
To: <ccielab@groupstudy.com>
Sent: Friday, April 14, 2000 2:09 PM
Subject: EBGP and IBGP
> In the Lab I am doing BGP a scenario with 6 routers in a straight line. I
> take 2 of the middle routers and do IBGP. The outside routers are doing
> EBGP only. I have been under the impression that if I am using an IGP
like
> OSPF between the two internal routers, the protocols will synchronize on
> their own (OSPF and IBGP), and EBGP routes will be passed. When I do
this,
> my routes will not propagate past the IBGP section in either direction.
The
> end EBGP systems are not exchanging routes. If I go to the two IGBP
routers
> and type NO SYNC. Everything works fine. Shouldn't OSPF and IBGP sync up
> on there own- without the NO SYNC command?
>
> I am studying from the Bruce Caslow book. It is not real clear on the
> subject.
>
> Thank you,
> Cliff Webster
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