From: DougAtHome (dcalton@fuse.net)
Date: Fri Apr 25 2003 - 07:22:50 GMT-3
In the case of the Solie lab, it is specifically stated to "sync BGP with
OSPF". Of course, many areas of his lab end up being fundamentally
unsolvable. The other lab, EIGRP is an ineligent option. I guess my
fundamental concern was and is whether or not sync and RR can co-exist.
According to another poster, the answer would be no. Well, I was just
checking for due dilligence to see if it was an issue for the lab. I'll
hope for the best and focus on other areas.
Thanks for the suggestion!
----- Original Message -----
From: "Paul Lalonde" <plalonde2@cogeco.ca>
To: "DougAtHome" <dcalton@fuse.net>; "ccielab" <ccielab@groupstudy.com>
Sent: Thursday, April 24, 2003 4:22 PM
Subject: Re: BGP Synchronization
> Doug,
>
> Redistribute the BGP routes from each BGP speaker into a different routing
> protocol (not OSPF) and redistribute between the IGPs to ensure each BGP
> speaker learns of the routes it is supposed to advertise via IGP. Is
there
> any requirement stating additional routing protocols cannot be used?
>
> Hope this helps,
> Paul
>
> ----- Original Message -----
> From: "DougAtHome" <dcalton@fuse.net>
> To: "ccielab" <ccielab@groupstudy.com>
> Sent: Thursday, April 24, 2003 3:08 PM
> Subject: BGP Synchronization
>
>
> > Time is getting short for me. I have tried in a couple of lab
scenarios,
> > including Solie's "Unnamed" lab, to implement Route Reflectors with
> > Synchronization turned on, where OSPF is the IGP. In both scenarios, a
> BGP RR
> > Client will not select IBGP routes as "best" because it will not
> synchronize.
> > Ultimately, this is due to the fact that Cisco mandates that the BGP and
> OSPF
> > source Router IDs match. Normally, this would not be a problem, but
> > apparently, IF the Route Reflector is NOT the redistribution router,
route
> > reflection overwrites the BGP Router ID for the reflected routes with
its
> own
> > Router ID. Here's a diagram of the situation:
> >
> > R4
> > |
> > |
> > R1 -------R2 ---------R3
> >
> > R2 in my diagram has an EBGP session with router R4, and IBGP session
with
> R3.
> > R3 is a Route Reflector, listing both R2 and R1 as clients. BGP is
> > redistributed into OSPF at R2, of course, since this is where the
external
> > routes are introduced. R3 synchronizes fine, but R1 shows all BGP
routes
> as
> > unsynchronized.
> >
> > I have tried various things, including Cluster IDs (couldn't make that
> config
> > "stick") and NOT making R1 a client, but still the same result - R3
> replaces
> > the original Router ID source with its own Router ID, causing R1 to
reject
> the
> > IGP route with the OSPF Router ID as a non match.
> >
> > I have searched the archives of this and other news groups and found no
> > solution. The closest I came was a long discourse that ended with using
> > Confederations.
> >
> > I guess I have two questions here:
> > 1. What am I not doing that might make this thing work?
> > 2. Why is Cisco so fussy about matching OSPF and BGP router ids anyway?
> This
> > seems to contradict the behavior of Route Reflection, and makes
> > Synchronization not only out of date, but non-functional to boot.
> >
> > Yeah, I know nobody uses Synchronization these days, but I'm studying
for
> the
> > lab (Sunday's the day for me =o... )
This archive was generated by hypermail 2.1.4 : Thu May 01 2003 - 13:36:06 GMT-3