Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

BGP connection collision

I have an eBGP peer that will not be established till a reset the peer about 10 times. I turned on ths BGP debug switch and I found that a message said:

connection collision

NOTIFICATION is sento to peer x.x.x.x

code 6 (cease).

And the BGP peer will be in Active state for long time and it will return back to Connect state and stuk in this state.

I know the problem of collision is because the both of peers are trying to initiate the connection at the same time and collision will happen.

So I want o know how to solve this problem or how to configure the peer to play only passive or active role.


Re: BGP connection collision


Use the following command to configure one side as passive:

neighbor transport connection-mode passive

Hope that helps - pls do rate the post if it does.


Cisco Employee

Re: BGP connection collision

I do not think this is collision related. It rather looks like a bug that I have come across a while ago. What version of code are you running on the IOS side?

Also, the cease code comes with a sub code. Can you please let us know what the subcode is.


Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600