From: Doug.Calton@getronics.com
Date: Thu Jan 08 2004 - 12:44:30 GMT-3
If I recall correctly, it is an issue of the RID for the ospf rtr
originating the route not lining up with the RID of the RR. There are a
number of white papers on this as well as threads in this and other
groups. I seem to recall this being in CCO as well in their white
papers, but no time to look it up right now.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
arvindyadav@comcast.net
Sent: Thursday, January 08, 2004 10:37 AM
To: Bob Sinclair; ccielab@groupstudy.com
Subject: Re: BGP issue - ospf, rr and no-synchronization
Bob
In this case RID is same on OSPF and BGP but still have issue.
R7#sh ip os
Routing Process "ospf 1" with ID 7.7.7.7
R7#sh ip bgp
BGP table version is 44, local router ID is 7.7.7.7
Arvind
----- Original Message -----
From: "Bob Sinclair" <bsinclair@netmasterclass.net>
To: <arvindyadav@comcast.net>; <ccielab@groupstudy.com>
Sent: Thursday, January 08, 2004 9:53 AM
Subject: Re: BGP issue - ospf, rr and no-synchronization
> This looks like the issue of non-matching OSPF-BGP RIDs. There is a
> paper that discusses this situation in the free technical library on
> the netmasterclass site. You might also find discussions in the
> groupstudy archives. It is very difficult to get RR to work right
> with sync on.
>
> HTH,
>
> Bob Sinclair
> CCIE #10427, CISSP, MCSE
> www.netmasterclass.net
>
>
>
> ----- Original Message -----
> From: <arvindyadav@comcast.net>
> To: <ccielab@groupstudy.com>
> Sent: Thursday, January 08, 2004 2:56 AM
> Subject: BGP issue - ospf, rr and no-synchronization
>
>
> > r7 is RR server and r6 and r2 are client with "synchronization". r6,
> > r7
> and
> > r2 running ospf and Router-id is same on both OSPF an BGP on all the
> > rotuers.
> >
> > r7
> > / \ AS2
> > AS1 / \
> > r8---ebgp---r6 r2
> >
> > r8 advertise two routes (137.20.81.0/24 and 137.20.82.0/24) to r6
> > and
> these
> > routes are appear in r6 router table as bgp route. R7 and R2 bgp
> > table
> shows
> > these routes are not-synchoronized and routing table has both route
> > as
> OSPF.
> > Next hop is also reachable. I don't understand why these are not
> > synchronised.
> >
> > BGP debug show "no best path".
> >
> > *Mar 16 03:10:22.310: BGP(0): nettable_walker 137.20.81.0/24 no best
path
> > *Mar 16 03:10:22.314: BGP(0): nettable_walker 137.20.82.0/24 no best
path
> > *Mar 16 03:10:22.318: BGP(0): nettable_walker 137.20.86.0/24 no best
> pathip
> > ro
> >
> >
> > If I put no-synchronization under bgp everything stats wokring
> > fine.
But
> > question is here if the route are there in IGP then why it not
> > woking
with
> > "sync". Does synchronization behave diferently with Route-refflector
> > or
I
> am
> > wrong somewhere ?
> >
> >
> > R7#sh ip os
> > Routing Process "ospf 1" with ID 7.7.7.7
> >
> >
> > R7#sh ip bgp
> > BGP table version is 44, local router ID is 7.7.7.7
> > Status codes: s suppressed, d damped, h history, * valid, > best, i
> > - internal Origin codes: i - IGP, e - EGP, ? - incomplete
> >
> > Network Next Hop Metric LocPrf Weight Path
> > *>i137.20.25.0/24 137.20.64.5 100 100 0 ?
> > * i137.20.40.16/28 137.20.64.5 100 100 0 ?
> > * i137.20.81.0/24 137.20.86.1 0 100 0 1 i
> > * i137.20.82.0/24 137.20.86.1 0 100 0 1 i
> >
> > R7#sh ip bgp 137.20.81.0
> > BGP routing table entry for 137.20.81.0/24, version 74
> > Paths: (1 available, no best path)
> > Flag: 0x208
> > Not advertised to any peer
> > 1, (Received from a RR-client)
> > 137.20.86.1 (metric 20) from 137.20.60.1 (6.6.6.6)
> > Origin IGP, metric 0, localpref 100, valid, internal, not
> > synchronized
> >
> > R7#ping 137.20.64.5
> >
> > Type escape sequence to abort.
> > Sending 5, 100-byte ICMP Echos to 137.20.64.5, timeout is 2 seconds:
> > !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max =
> > 16/16/20 ms R7#r
> > Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B -
BGP
> > D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter
area
> > N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type
2
> > E1 - OSPF external type 1, E2 - OSPF external type 2, E -
EGP
> > i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 -
IS-IS
> > level-2
> > ia - IS-IS inter area, * - candidate default, U - per-user
static
> > route
> > o - ODR, P - periodic downloaded static route
> >
> > Gateway of last resort is not set
> >
> > O E2 137.20.86.0/24 [110/20] via 137.20.25.2, 00:00:33, Serial1
> > O E2 137.20.81.0/24 [110/1] via 137.20.25.2, 00:00:33, Serial1
> > O E2 137.20.82.0/24 [110/1] via 137.20.25.2, 00:00:33, Serial1
> >
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