[c-nsp] 7206VXR NPE-G1 Upgrade from 12.4 to 15.0 High CPU

[Chris Gotstein]

We had definite issues when the CPU starting getting above 80%.  At 90% 
it was almost unusable.

On 8/24/2011 5:02 PM, Joe Maimon wrote:
> I have seen this in other instances as well. A 2811 never dips below 10%
> (cpu is graphed) even off-peak with nothing going on. The 1700 it
> replaced properly flat-lined to 0% at the same times.
>
> It remains to be seen whether this is an aesthetic issue or an actual
> problem.
>
> I am looking at a G1 running 15.0 pushing a few hundred mbps peaking at
> near 90% (cpu graph) without any user reported issues reaching me. Some
> of that traffic is IOS FW, some is ATM, most is inter-vlan. Full tables.
>
> Joe
>
> Chris Gotstein wrote:
>> Decided to move from IOS 12.4 to 15.0 (15.0(1)M7) on a 7206VXR with
>> NPE-G1. Since doing the upgrade, i've seen increased CPU usage in the
>> IP Input process. The configuration remained the same after the upgrade.
>> Verified CEF on all interfaces. Followed troubleshooting docs on Cisco's
>> site, as well as searching the archives of nsp. Not able to find any
>> info to help troubleshoot this issue. This is an edge router connecting
>> to our 2 upstream providers, taking full BGP routes. As of 4am (CST),
>> traffic is pretty much dead, less than 20Mbs going through, and CPU
>> usage is at 35%. Normally it's around 10% for this time of night. Any
>> ideas of what could be going on? I haven't downgraded the IOS just yet,
>> hoping to see if i might have missed something easy. Thanks,
>>

-- 
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Chris Gotstein, Network Engineer, U.P. Logon/Computer Connection U.P.
http://uplogon.com | +1 906 774 4847 | chris at uplogon.com