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

[Joe Maimon]

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,
>