[c-nsp] Idle sessions on 12.2(33)SR cause high CPU

[Daniel Holme]

Yes I've experienced this on a 7600 running 12.2(33)SRC3.

I have experienced it a number of times too, one of which was the XP
issue you mention.

You don't want too many people configuring passive sessions as having
that on both ends is equally as bad as shutting down the session.

--Dan 

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Zoe O'Connell
> Sent: 11 December 2009 10:20
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Idle sessions on 12.2(33)SR cause high CPU
> 
> Hi,
> 
> As a result of issues at an exchange point over the last few days, a
> number of us (ISPs) have noticed an issue with BGP sessions sitting in
> the "Idle" state, because the other end is shut down.
> 
> Basically, it appears that on Sup720s at least, once you reach a
> critical number of sessions in Idle (More than 5, less than 20) the
CPU
> usage increases to 30%, all down to the BGP Router process. 30ish
> sessions down and it's up to 50% - we've had ours up to 70% as a
result
> of this, although I don't know how many sessions were down at that
> point. This behaviour has been confirmed on 12.2(33)SRC4 and
> 12.2(33)SRD2, with other possible reports on SXF, SRC3, SRC5 and also
on
> CRS-1s. Has anyone seen this before and know if it's a known issue
with
> a BugID associated?
> 
> A workaround is to apply "neigh x.x.x.x transport connection passive"
> but this clearly isn't optimal.
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
> 
> ______________________________________________________________________
> This email has been scanned by the MessageLabs Email Security System.
> For more information please visit http://www.messagelabs.com/email
> ______________________________________________________________________
This email has been scanned for all viruses.

Please consider the environment before printing this email.

The content of this email and any attachment is private and may be privileged. If you are not the intended recipient, any use, disclosure, copying or forwarding of this email and/or its attachments is unauthorised. If you have received this email in error please notify the sender by email and delete this message and any attachments immediately. Nothing in this email shall bind the Company or any of its subsidiaries or businesses in any contract or obligation, unless we have specifically agreed to be bound.

KCOM Group PLC is a public limited company incorporated in England and Wales, company number 02150618 and whose registered office is at 37 Carr Lane, Hull, HU1 3RE.

118288 - KCOM Group UK Directory Enquiries. Calls will cost no more than 49p connection + 14p per minute including VAT from a KC or BT landline. Call charges from mobiles and other networks may vary. If you are calling from a mobile you will now receive your requested number via text message. You will not be charged for the text message.