[c-nsp] Tuning HSRP timers for BGP routers

[Matthew Huff]

Average less than 10%, peek at 40%

----
Matthew Huff             | 1 Manhattanville Rd
Director of Operations   | Purchase, NY 10577
OTA Management LLC       | Phone: 914-460-4039
aim: matthewbhuff        | Fax:   914-460-4139


> -----Original Message-----
> From: Mack McBride [mailto:mack.mcbride at viawest.com]
> Sent: Wednesday, May 09, 2012 2:24 PM
> To: Matthew Huff; 'cisco-nsp at puck.nether.net'
> Subject: RE: Tuning HSRP timers for BGP routers
> 
> What is your base CPU utilization?
> 
> Mack
> 
> -----Original Message-----
> From: Matthew Huff [mailto:mhuff at ox.com]
> Sent: Wednesday, May 09, 2012 12:22 PM
> To: Mack McBride; 'cisco-nsp at puck.nether.net'
> Subject: RE: Tuning HSRP timers for BGP routers
> 
> That's the thing, we aren't getting any BGP events, just HSRP ones. The
> netflow analysis don't show a high bandwidth utilization, that's why I
> was looking at the BGP re-calc causing the HSRP hellos to drop.
> 
> 
> ----
> Matthew Huff             | 1 Manhattanville Rd
> Director of Operations   | Purchase, NY 10577
> OTA Management LLC       | Phone: 914-460-4039
> aim: matthewbhuff        | Fax:   914-460-4139
> 
> 
> > -----Original Message-----
> > From: Mack McBride [mailto:mack.mcbride at viawest.com]
> > Sent: Wednesday, May 09, 2012 1:39 PM
> > To: Matthew Huff; 'cisco-nsp at puck.nether.net'
> > Subject: RE: Tuning HSRP timers for BGP routers
> >
> > We use timers 2 and 6 on multiple sets of 6500s with a relatively
> > large number of VLANs.
> > The 6500 has a much less powerful CPU and seems to handle it ok.
> > However, the 7200 is a software device so through traffic can have a
> > major effect on CPU.
> > It may be you have large high BW bursts during backups or something
> > similar.
> > You should probably do some correlation analysis before blaming the
> > BGP.
> > If you are getting that kind of BGP event on a nightly  basis you
> > should probably talk to your provider.
> >
> > LR Mack McBride
> > Network Architect
> >
> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> > bounces at puck.nether.net] On Behalf Of Matthew Huff
> > Sent: Wednesday, May 09, 2012 7:46 AM
> > To: 'cisco-nsp at puck.nether.net'
> > Subject: [c-nsp] Tuning HSRP timers for BGP routers
> >
> > We have a pair of Cisco 7204VXR with NPE-G2 running 15.1(4)M3. We are
> > using default timers for the HSRP interfaces, and we are seeing
> > nightly HSRP state changes. Not a lot, but 1-2 a night. This appears
> > to only have started recently.  We are looking at logs, but I assume
> > it's due to BGP cpu exhaustion. We don't see any L2 errors on the
> VLAN
> > where the HSRP is running, so I don't think it's a physical problem.
> >
> >
> >
> > What timers do people use for HSRP on BGP routers as a practice?
> > Obviously we want the smallest timers that would be possible.
> >
> >
> >
> > ----
> >
> > Matthew Huff             | 1 Manhattanville Rd
> >
> > Director of Operations   | Purchase, NY 10577
> >
> > OTA Management LLC       | Phone: 914-460-4039
> >
> > aim: matthewbhuff        | Fax:   914-460-4139
> >
> >

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