From: arvindyadav@comcast.net
Date: Thu Jan 08 2004 - 04:56:27 GMT-3
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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