[c-nsp] IOS and BGP Cease Notification Messages

Martin T m4rtntns at gmail.com
Fri Oct 5 03:29:08 EDT 2012


Oliver,

thank you for explaining this! In addition to Cisco routers running
IOS-XR, Brocade and Juniper routers seem to support sending BGP CEASE
messages as well. I'm not able to test with Brocade routers, but for
example under JUNOS(10.4R9.2) if I commit "deactivate neighbor
10.10.10.69" I can see the "*Oct  5 07:06:35.439: %BGP-3-NOTIFICATION:
received from neighbor 10.10.10.70 6/3 (cease) 0 bytes" log message in
Cisco router.


regards,
Martin

2012/9/18, Oliver Boehmer (oboehmer) <oboehmer at cisco.com>:
> Martin,
>
>>
>>as I have understood, graceful way to disable BGP peer under IOS is to
>>execute "neighbor <IP address> remote-as <ASN> shutdown" command under
>>"router bgp <ASN>" configuration. I made such simple setup for testing
>>this: http://i.imgur.com/phzvY.png  In case I execute "neighbor
>>10.10.10.68 remote-as 65002 shutdown" in "Cisco_R2" I can see in
>>"Cisco_R1" log(logging buffered 32000 informational) following log
>>entry:
>>
>>*Sep 17 16:14:18.744: %BGP-5-ADJCHANGE: neighbor 10.10.10.69 Down Peer
>>closed the session
>>
>>This nicely indicates that other peer closed the session. Am I correct
>>that in case I execute "neighbor 10.10.10.68 remote-as 65002
>>shutdown", the 10.10.10.69 router sends BGP cease(explained here:
>>http://www.net-gyver.com/?p=1241) message to 10.10.10.68? For some
>>reason I was not able to detect those messages even with "debug ip bgp
>>all" running both in "Cisco_R1" and "Cisco_R2". Any ideas why? In
>>addition, is it somehow possible to manually specify which cease code
>>to send? For example one would like to send Cease 6/3(peer
>>de-configured) to a BGP neighbor- is this possible?
>
> Unfortunately IOS doesn't currently send CEASE in such a case, it just
> closes the session.. There is a DDTS open which documents this, but it
> hasn't been worked on yet (CSCds06069 - BGP: Router should send CEASE
> NOTification when admin shutdown). IOS-XR does send it, but this doesn't
> help you :-|
>
> 	oli
>
>


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