BGP brain block

From: EHess (ehess@xxxxxxxxxxxxx)
Date: Sat Apr 22 2000 - 10:16:41 GMT-3


   
I am having a brain block with BGP when using IBGP in an AS. The situation
is this: I have 2 routers in the same AS connected by a token ring network
as IBGP peers. The first router is also an EBGP router and seems to show all
routes properly in its routing table.

The second router (IBGP peer) shows all the routes in its BGP table but not
in the main routing table. It is my understanding that the routes should be
displayed in the main routing table table because the second router has a
route to the next-hop-address. The only way I can get this to work is by
using the "no sync" command.

Question: Am I correct in my thinking or can someone straighten me out on
this matter. I am attaching copies of the main routing table and the BGP
table.

Thanks for any help,
Edward Hess

Gateway of last resort is not set

R 172.18.0.0/16 [120/1] via 180.100.1.1, 00:00:02, TokenRing0
     11.0.0.0/24 is subnetted, 1 subnets
B 11.1.1.0 [20/0] via 180.100.2.2, 00:00:03
     180.100.0.0/24 is subnetted, 2 subnets
C 180.100.1.0 is directly connected, TokenRing0
C 180.100.2.0 is directly connec

happy#ping 172.18.105.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.18.105.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/41/44 ms
happy#sh ip rou 172.18.105.1
Routing entry for 172.18.0.0/16
  Known via "rip", distance 120, metric 1
  Redistributing via rip
  Advertised by rip (self originated)
  Last update from 180.100.1.1 on TokenRing0, 00:00:01 ago
  Routing Descriptor Blocks:
  * 180.100.1.1, from 180.100.1.1, 00:00:01 ago, via TokenRing0
      Route metric is 1, traffic share count is 1

happy#sh ip bgp
BGP table version is 20, local router ID is 180.100.2.1
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
*>i10.1.1.0/24 180.100.1.1 0 100 0 i
*> 11.1.1.0/24 180.100.2.2 0 0 400 i
*>i160.1.1.0/24 172.18.105.1 100 0 200 100 i
*>i161.1.1.0/24 172.18.105.1 100 0 200 100 i
*>i163.100.0.0 172.18.105.1 100 0 200 100 i
*>i171.17.1.0/24 172.18.105.1 0 100 0 200 i
*>i171.18.1.0/24 172.18.105.1 0 100 0 200 i
*>i172.18.0.0 172.18.105.1 0 100 0 200 i
*>i172.18.104.0/24 172.18.105.1 100 0 200 100 i
*>i172.18.105.0/24 180.100.1.1 0 100 0 i
*> 180.100.0.0 0.0.0.0 0 32768 i
* i 180.100.1.1 0 100 0 i
*> 180.100.1.0/24 0.0.0.0 0 32768 i
*> 180.100.2.0/24 180.100.2.2



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