From: Muralidhar Devarasetty (dhar_murali@xxxxxxxxxxx)
Date: Fri Jul 09 1999 - 12:15:03 GMT-3
Use Nosync command for forcing the BGP to put the routes in the routing
table without finding the same route thr' IGP.Otherwise redistribute BGP in
to the IGP at RD so that all the routers learn the route thr' IGP then
automatically they put the BGP route in to the routing table.BGP route will
have higher priority b'se of lower administrative distance.
----Original Message Follows----
From: "Scott O'Donnell" <scotto@iworksys.com>
Reply-To: "Scott O'Donnell" <scotto@iworksys.com>
To: "ccielab@groupstudy.com" <ccielab@groupstudy.com>,
"cisco@spot.colorado.edu" <cisco@spot.colorado.edu>
Subject: BGP is driving me crazy.
Date: Mon, 05 Jul 1999 23:02:41 -0400
Hello,
I hope I can explain this.
I have setup five routers RA,RB,RC,RD,RE (left to right). All routers
are connected in a row via serial links.
Like this: RA ------ RB ------ RC ------- RD ------- RE
I have the links assigned subnets as follows:
RA->RB = 4.4.4.0/24
RB->RC = 3.3.3.0/24
RC->RD = 2.2.2.0/24
RD->RE = 1.1.1.0/24
RA is assigned and running BGP AS 400
RB,RC,RD are assigned and running BGP AS 100, IBGP connections fully
meshed.
RE is assigned and running BGP AS 200
RE is originating network 128.213.1.0/24 with a network command
"Network 128.213.0.0"
RD learns the 128.213.0.0 route and places it in it's table with the
next hop as 1.1.1.1 (RE)
RC learns the 128.213.0.0 route in it's BGP table (SHO IP BGP) but
doesn't place it in the route table.
RB learns the 128.213.0.0 route in it's BGP table (SHO IP BGP) but
continues to display a console
message "BGP: no valid path for 128.213.0.0/16" .
Both RC and RB have routes in their route table for network 1.0.0.0/8
rB#sho ip bgp
BGP table version is 39, local router ID is 200.200.200.5
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
*>i1.0.0.0 2.2.2.2 0 100 0 i
*>i2.0.0.0 2.2.2.2 0 100 0 i
*>i3.0.0.0 2.2.2.1 1 100 0 i
*> 110.0.0.0 4.4.4.4 0 0 400 i
* i128.213.0.0 1.1.1.1 0 100 0 200 i
*>i192.212.1.0 2.2.2.2 0 100 0 i
sho ip route
R 1.0.0.0/8 [120/2] via 3.3.3.3, Serial0
R 2.0.0.0/8 [120/1] via 3.3.3.3, Serial0
3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
S 3.0.0.0/8 is directly connected, Null0
C 3.3.3.0/24 is directly connected, Serial0
4.0.0.0/24 is subnetted, 1 subnets
C 4.4.4.0 is directly connected, Ethernet0
B 110.0.0.0/8 [20/0] via 4.4.4.4
R 192.212.1.0/24 [120/2] via 3.3.3.3, Serial0
Why doesn't RB learn about the 128.213.0.0 network in AS 200?
Am I missing the big picture?
Scott
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:21:41 GMT-3