[c-nsp] 3750 with high CPU

[Ed Butler]

We had this before - it was a real pain to track down. On our 3750s it
turned out that we were running out of TCAM space for IPv4 routes. What
do these two commands show?

sh ip arp summ

sh sdm prefer 

Regards,

Ed Butler
RapidSwitch Ltd
DDI: 020 7106 0731

RapidSwitch Ltd, 5th Floor, Sovereign House, 227 Marsh Wall, London, E14
9SD

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-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Rubens Kuhl Jr.
Sent: 18 December 2006 14:34
To: Cisco-NSP Mailing List
Subject: [c-nsp] 3750 with high CPU

I'm trying to diagnose what is causing a 3750 ME to have high cpu usage.
"show proc cpu sorted" shows no process with more than 3% CPU usage;
sometimes the most consuming process is "IP SNMP", sometimes it's "MFI
LD Timer", sometimes it is "Spanning Tree", but adding up the % doesn't
come even close to the total amount:
"CPU utilization for five seconds: 64%/56%; one minute: 64%; five
minutes: 63%"

So, it seems something in the interrupt path is causing the CPU usage.

#sh ip cef switching statistics

       Reason                          Drop       Punt  Punt2Host
RP RIB Packet destined for us             0   10221271          0
RP RIB Total                              0   10221271          0

RP LES No route                       13826          0        555
RP LES Packet destined for us             0    1041551          0
RP LES No adjacency                   18970          0     171714
RP LES Unresolved route                  45          0          0
RP LES TTL expired                        0          0       8440
RP LES IP options set                     0          0      11111
RP LES Routed to Null0                12735          0      15991
RP LES IP redirects                       0          0         56
RP LES Unclassified reason             3648          0          0
RP LES Total                          49224    1041551     207867

All    Total                          49224   11262822     207867


RP RIB punts are ocurring at a rate of 5 pps, and RP LES punts have a
near 1 pps rate. Are these rates enough to take the 3750 CPU to 60%
usage ? Any ideas of what to look for ?

IOS version is 12.2(25)SED, running MPLS, IBGP for VPNv4 and OSPF.



Rubens
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