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Engager

BGP flapped

hi all,

i've encountered a short flap a while ago on one of our BGP router and was searching for a good link explaining the output of 'due to Active open failed' but only find link below, which is not too much info on it.

google is also failing me at this time. could someone explain to me briefly what could've caused this and what does the output in bold is all about? thanks in advance!

https://supportforums.cisco.com/thread/2111031

.Apr 24 16:49:20.683 SGT: %BGP-5-ADJCHANGE: neighbor 203.x.x.x Down BGP Notification sent

.Apr 24 16:49:20.683 SGT: %BGP-3-NOTIFICATION: sent to neighbor 203.x.x.x 4/0 (hold time expired) 0 bytes

.Apr 24 16:49:21.387 SGT: %BGP_SESSION-5-ADJCHANGE: neighbor x.x.x.x IPv4 Unicast topology base removed from session  BGP Notification sent

.Apr 24 16:54:09.783 SGT: %BGP-5-ADJCHANGE: neighbor 203.x.x.x Up

#sh ip bgp summ | i 1234

203.x.x.x   4  1234    237     230 368593758    0    0 01:44:04       29

#sh ip bgp nei 203.x.x.x

<SNIP>

Last reset 01:51:26, due to Active open failed

Everyone's tags (5)
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Beginner

BGP flapped

did you check the TCP connection?

did you done the L1 connectivity

did you confirm with ISP if they made any chenges?

Beginner

BGP flapped

What type of connection are you using? this could be caused due to wan link flap.

Advisor

Re:BGP flapped

It means that your active connection failed. Since bgp works at layer 3 there are a couple of things to check. It's your interface for bgp up? Or up/down? Another common bgp peer drop is an acl being applied that blocks bgp communications. Also adding a password in bgp will cause this. Typically a bad password message would be in the logs.


Sent from Cisco Technical Support Android App

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