IBGP nei Router in Active state

[mahesh18]

                   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

[Reza Sharifi]

Hi Mahesh

Do you have rachablity from Rt loopback address to Rt loopback address can they ping each other?

HTH

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[mahesh18]

Hi Reza,

I can ping from R1 loopback address  to R2  but not from R2 to R1.

Thanks

MAhesh

[Reza Sharifi · Accepted solution]

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

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[mahesh18]

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

[Reza Sharifi]

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

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[mahesh18]

Hi Reza,

Thanks for the very helpfull  info

Regards

Mahesh