[c-nsp] Tuning HSRP timers for BGP routers

[Pete Lumbis]

Mitch,

You can deploy something like this

===========================
event manager applet cpuspike
event snmp oid "1.3.6.1.4.1.9.9.109.1.1.1.1.10.1" get-type next
entry-op  ge entry-val "50" exit-time 60 poll-interval 1
action 1.0 syslog msg "CPU Spike Detected - Please issue more
flash:cpuinfo for data"
action 2.0 cli command "en"
action 3.0 cli command "show proc cpu sort | append flash:cpuinfo"
action 4.0 cli command "show proc cpu history | append flash:cpuinfo"
action 5.0 cli command "show interface | append flash:cpuinfo"
===========================

This will poll on a 1 second interval and trigger anytime CPU is over
50 percent. After it fires it will sleep for 60 seconds before
attempting to run a second time.

Since this requires enable mode you may need to add "event manager
session cli username <username>" to the global config where the
username will be someone with the authorization to run the commands
listed.

I'd suggest double checking this OID as I think this is from a script
I used on a 6k, not for the 7200. Make sure you are using the current
CPU OID and not the 5 second CPU OID.

If you want to test it just change the "entry-val 50" to say, 1 and
run a "show tech" or anything else that would cause a small bump in
CPU and you should see it trigger.

-Pete


On Wed, May 9, 2012 at 11:28 PM,  <mitch at stonernetworks.com> wrote:
> Perhaps EEM is something that could be helpful here...
>
>> 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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