05-05-2012 01:29 PM - edited 03-07-2019 06:32 AM
Hi all,
I have Router R1,R2 R3 and R4.
R3 and R4 are EBGP peers
R2 and R3 are IBGP peers
Also R2 has IBGP connection to R1.
Issue is that R2 BGP nei R1 shows active state from both sides.
R2 config
*************************************************************************************
neighbor 100.100.100.100 remote-as 6500
neighbor 100.100.100.100 update-source Loopback2
neighbor 100.100.100.100 route-reflector-client
where 100.100.100.100 is loopback of IBGP nei R1.
R2 sh ip bgp summ
*************************************************************************
100.100.100.100 4 6500 0 0 0 0 0 never Active
i am redistribute loopback IP of R2 which is 2.2.2.2 into ospf
From R1 router i can ping the Loopback of R1 which is 2.2.2.2
R1#ping 2.2.2.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
R1 config
*******************
neighbor 2.2.2.2 remote-as 6500
neighbor 2.2.2.2 update-source Loopback100
R1 sh ip bgp summ
***********************************************************************
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
2.2.2.2 4 6500 15133 14958 0 0 0 04:05:59 Active
Thanks
Mahesh
Solved! Go to Solution.
05-05-2012 01:51 PM
Ok than make sure both R1 and R2 loopback addresses are added to OSPF or. a static route from R1 to R2 and one from R2 to R1
You have to have readability first if not BGP peering will not be established
HTH
Sent from Cisco Technical Support iPhone App
05-05-2012 01:40 PM
Hi Mahesh
Do you have rachablity from Rt loopback address to Rt loopback address can they ping each other?
HTH
Sent from Cisco Technical Support iPhone App
05-05-2012 01:46 PM
Hi Reza,
I can ping from R1 loopback address to R2 but not from R2 to R1.
Thanks
MAhesh
05-05-2012 01:51 PM
Ok than make sure both R1 and R2 loopback addresses are added to OSPF or. a static route from R1 to R2 and one from R2 to R1
You have to have readability first if not BGP peering will not be established
HTH
Sent from Cisco Technical Support iPhone App
05-05-2012 02:02 PM
Hi Reza,
All the config was good as it was working fine before.
but now removing the loopback ip from R1 under ospf and putting it back again fixes the issue.
router ospf 1
R1(config-router)# no network 100.100.100.100 0.0.0.0 area 0
R1(config-router)# network 100.100.100.100 0.0.0.0 area 0
Thanks for help
Mahesh
05-05-2012 02:11 PM
Excellent I am glad it is working now
Remember as a last resort if routing protocols are not working you can always use a couple of static route to troubleshoot the issue
If static routes fixes the issue than you know the problem is the routing protocol
Once you fix the routing protocol issue you can remove the static routes
Have fun with BGP
Sent from Cisco Technical Support iPhone App
05-05-2012 02:13 PM
Hi Reza,
Thanks for the very helpfull info
Regards
Mahesh
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