From: radha rani (radhaccie@xxxxxxxxxxx)
Date: Thu Sep 14 2000 - 23:57:57 GMT-3
Hi all,
I have a BGP scenario where AS300 and AS350 are a part of a BGP
Confederation (id 30).
R5 is originating networks 55.1.1.0, 54.1.1.0 & 100.100.100.0 and advertises
them to BGP peers R3 and R7 via EBGP.
R1 learns them via EBGP from R3.
R2 learns via IBGP from R6 (R6 learns from R7 via EBGP). R2 also learns
them from R1 via external bgp (I guess - since they are both in
confederation 30)
R4(AS350,30)
|
R3(AS2)=====R1=====R2(AS300,30)
| (AS350,30) |
| |
| |
ethernet ethernet
| |
R5 R6(AS300,30)
| |
| |
| ethernet
| |
| |
| R7(AS70)
| |
| |
--------ethernet----------
R1 is conn to R2 and R3 via a multipoint sub-interface, to R4 via a
point-to-point subinterface. Rest of the netw is all ethernets as shown.
My problem is that R1 is not getting the update for these networks
from R2 so that I have multiple paths to these networks in R1's
BGP table.
R2 does advertise the network to R1 but it stays in R1's BGP table
momentarily and then gets withdrawn (see debug output below). R2
and R1 are external BGP peers within confederation 30 so R1 should
able to receive these updates from R2 - right?
I don't understand why the routes are being withdrawn? Can someone
explain what I am missing. Thanks in advance for the help.
r1#bgp
BGP table version is 4, local router ID is 10.15.1.1
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
* 54.1.1.0/24 20.20.1.2 100 0 (300) 70 1 i
*> 20.20.1.3 0 2 1 i
* 55.1.1.0/24 20.20.1.2 100 0 (300) 70 1 i
*> 20.20.1.3 0 2 1 i
* 100.100.100.0 20.20.1.2 100 0 (300) 70 1 ?
*> 20.20.1.3 0 2 1 ?
r1#
BGP: 20.20.1.2 rcv UPDATE about 54.1.1.0/24 -- withdrawn
BGP: 20.20.1.2 rcv UPDATE about 55.1.1.0/24 -- withdrawn
BGP: 20.20.1.2 rcv UPDATE about 100.100.100.0/24 -- withdrawn
r1#
r1#bgp
BGP table version is 4, local router ID is 10.15.1.1
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
*> 54.1.1.0/24 20.20.1.3 0 2 1 i
*> 55.1.1.0/24 20.20.1.3 0 2 1 i
*> 100.100.100.0 20.20.1.3 0 2 1 ?
Meanwhile, R2 has a path via R1 and R6 BOTH!!
r2#bgp
BGP table version is 7, local router ID is 11.1.1.5
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
*> 54.1.1.0/24 20.20.1.3 100 0 (350) 2 1 i
* i 11.2.1.7 100 0 70 1 i
*> 55.1.1.0/24 20.20.1.3 100 0 (350) 2 1 i
* i 11.2.1.7 100 0 70 1 i
*> 100.100.100.0 20.20.1.3 100 0 (350) 2 1 ?
* i 11.2.1.7 100 0 70 1 ?
r2#
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