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BGP - no route to peer

Mahesh Gohil
Level 7
Level 7

Hi experts,

I am trying to understnad BGP messages and i configured bgp as below.

@@@@@@@@ A-End @@@@@@@

interface Loopback100
ip address 192.168.14.1 255.255.255.255

router bgp 9498
no synchronization
bgp log-neighbor-changes
neighbor 172.16.16.1 remote-as 64520
neighbor 172.16.16.1 update-source Loopback100
no auto-summary

ip route 172.16.16.1 255.255.255.255 10.10.10.2

@@@@@@@@ B-End @@@@@@@

interface Loopback100
ip address 172.16.16.1 255.255.255.255

router bgp 64520
no synchronization
bgp log-neighbor-changes
neighbor 192.168.14.1 remote-as 9498
neighbor 192.168.14.1 ebgp-multihop 3
neighbor 192.168.14.1 update-source Loopback100
no auto-summary

ip route 192.168.14.1 255.255.255.255 10.10.10.1

I purposefully removed ebgp-multihop 3 command from A-end and bgp is not coming up as expected. I have also captured wireshark and i can see that B end is sending TCP packet and A end is sending RST message. I just what to know how A end is sending reset, I mean what is it verifying. I tried to run bgp debug but only getting below message which is misleading. Is there any way to see how router at A end is decided to send TCP RST message.

*Feb 23 18:04:19.811: BGP: 172.16.16.1 active open failed - no route to peer, open active delayed 10240ms (35000ms max, 60% jitter)

Please let me know if my query is confusing.

Regards

Mahesh

15 Replies 15

Hi,

Thank you! It is a pleasure and a reward in itself to know this thread continues to help people get things straight... Take care, and good luck!

Best regards,

Peter

Review Cisco Networking for a $25 gift card