From: OhioHondo (ohiohondo@columbus.rr.com)
Date: Mon Apr 14 2003 - 17:20:07 GMT-3
That would work and I've seen examples used in that way. I haven't seen
anything that explicitly says it has to be done that way. If what you're
saying is true:
1) It is a definite difference between when to use router reflectors and
when to use confederations. What your saying is that Route Refectors have to
be used if all of the BGP routers in the AS are in the same IGP domain.
2) If your using OSPF and you have to divvy up your IGP into 2 or 3 or 4
OSPF domains to accommodate a confederation, that's a lot of work!!!
-----Original Message-----
From: ccie2be [mailto:ccie2be@nyc.rr.com]
Sent: Monday, April 14, 2003 3:54 PM
To: Group Study; OhioHondo
Subject: Re: BGP Confederation and Synchronization
Hi,
The way I understand it, each sub -AS s/b a different IGP domain, so you
shouldn't have OSPF or any other IGP advertising routes outside the sub-As -
that's the job of BGP. So, it looks like in your case, where you have R3
and R2 in the same OSPF domain, you have a config which wouldn't work. Jim
----- Original Message -----
From: "OhioHondo" <ohiohondo@columbus.rr.com>
To: <ccielab@groupstudy.com>
Sent: Monday, April 14, 2003 10:26 AM
Subject: BGP Confederation and Synchronization
> Hello
>
> I have a question for someone with a grasp on BGP Confederations and how
> synchronization affects it. My scenario
>
> AS301/R7 --- AS501/sub-AS65001/R3 --- AS501/sub-AS65002/R1 --- AS101/R9
> |
> |
> AS501/subAS65001/R2
>
> Routers R1, R2 and R3 are in a single OSPF domain. The BGP router-id's and
> OSPF router-ids are the same on all routers.
>
> My problem --- an advertisement comes in from AS101/R9, let say
49.0.0.0/8.
> That advertisement is propagated via OSPF to router R2 with R1's OSPF
> router-id.
>
> When that advertisement crosses the sub-AS border between R1 and R3, the
BGP
> router-id is changed to that of R3, therefor when the iBGP route gets to
R2,
> the BGP router-id is from R3 while the OSPF router-id is from R1. The
result
> is no sync. Any advice????
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