One
of the most important player of a Service Provider Backbone Network is BGP
which should be stable at any cost, but it will make life tough when you see
some logs like shown below or something down and BGP is associated with that
down state. Same is the case happened with us yesterday, we received a TT for a
circuit was down, when we check all the possible aspects, so We came across
with this BGP error named CEASE with subCode error other configuration changed
shown below in logs.
State : Down
Error Code : 6(CEASE)
Error Subcode : 6(Other Configuration Change)
Notification: Receive Notification
There can be multiple Subcode error, I will talk here error CEASE with Subcode other configuration changed, According to RFC 4486 - If a BGP speaker decides to administratively reset the peering with a neighbour due to a configuration change other than the ones described above, then the speaker SHOULD send a NOTIFICATION message with the Error Code Cease and the Error Subcode “Other Configuration Change“.
I hope this will be informative for you :)
Jan 22 2013 09:45:07.700.3+03:00
PE-AggX16-Baha-712-1 %%01BGP/3/STATE_CHG_UPDOWN(l)[743]:The status of the peer
172.31.184.110 changed from ESTABLISHED to IDLE.
(InstanceName=V1907:MOI-PRISON, StateChangeReason=Notification
Message Received)
Jan 22 2013 09:44:51.50.1+03:00 PE-AggX16-Baha-712-1
%%01BGP/3/STATE_CHG_UPDOWN(l)[744]:The status of the peer 172.31.184.110
changed from OPENCONFIRM to ESTABLISHED. (InstanceName=V1907:MOI-PRISON,
StateChangeReason=Up)
Jan 22 2013 09:44:19.690.3+03:00
PE-AggX16-Baha-712-1 %%01BGP/3/STATE_CHG_UPDOWN(l)[745]:The status of the peer
172.31.184.110 changed from ESTABLISHED to IDLE.
(InstanceName=V1907:MOI-PRISON, StateChangeReason=Notification Message
Received)
Jan 22 2013 09:44:05.40.1+03:00 PE-AggX16-Baha-712-1
%%01BGP/3/STATE_CHG_UPDOWN(l)[747]:The status of the peer 172.31.184.110
changed from OPENCONFIRM to ESTABLISHED. (InstanceName=V1907:MOI-PRISON,
StateChangeReason=Up)
Jan 22 2013 09:43:33.620.3+03:00 PE-AggX16-Baha-712-1
%%01BGP/3/STATE_CHG_UPDOWN(l)[748]:The status of the peer 172.31.184.110
changed from ESTABLISHED to IDLE. (InstanceName=V1907:MOI-PRISON,
StateChangeReason=Notification Message Received)
Peer: 172.x.x.x
Date/Time : 2013-01-22 13:22:19+03:00State : Down
Error Code : 6(CEASE)
Error Subcode : 6(Other Configuration Change)
Notification: Receive Notification
There can be multiple Subcode error, I will talk here error CEASE with Subcode other configuration changed, According to RFC 4486 - If a BGP speaker decides to administratively reset the peering with a neighbour due to a configuration change other than the ones described above, then the speaker SHOULD send a NOTIFICATION message with the Error Code Cease and the Error Subcode “Other Configuration Change“.
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