Paul Stewart wrote:
Hi,
On a peering session we started getting the following:
%BGP-3-NOTIFICATION: received from neighbor 198.32.XXX.XX 6/7 (cease) 0
bytes
This all started when we "upgraded" to 12.2(18)SXF16 it seems or at least
the timeline matches up..
So, I've discovered that 6/7 means "Connection collision resolution" - does
anyone know what that means in English? ;) We have rebuilt our session and
the peer has done the same thing. a Google search tells me what it means by
definition but no real solution.
From RFC 4271:
6.8. BGP Connection Collision Detection
If a pair of BGP speakers try to establish a BGP connection with each
other simultaneously, then two parallel connections well be formed.
If the source IP address used by one of these connections is the same
as the destination IP address used by the other, and the destination
IP address used by the first connection is the same as the source IP
address used by the other, connection collision has occurred. In the
event of connection collision, one of the connections MUST be closed.
[...]
Closing the BGP connection (that results from the collision
resolution procedure) is accomplished by sending the NOTIFICATION
message with the Error Code Cease.
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