SNMP cause High CPU utilization

[tmesbah]

Hi,

On one of our Catalyst 5509 [CatOS:5.5(13a), IOS:120(21a)], the CPU on RSM is going high close to 80% and "sh proc cpu" showed that IP SNMP is the cause.

I did ip debug snmp and the result was [x.x.x.x is the IP of NNM "OpenView":

==================

6d04h: SNMP: Packet sent via UDP to x.x.x.x

6d04h: SNMP: Packet received via UDP from x.x.x.x on Vlan89

6d04h: SNMP: Get-next request, reqid 2107644, errstat 0, erridx 0

ipAddrEntry.1.X.X.X.X = NULL TYPE/VALUE

ipAddrEntry.3.X.X.X.X = NULL TYPE/VALUE

ipAddrEntry.2.X.X.X.X = NULL TYPE/VALUE

6d04h: SNMP: Response, reqid 2107644, errstat 0, erridx 0

ipAddrEntry.1.X.X.X.X = X.X.X.X

ipAddrEntry.3.X.X.X.X = 255.255.255.0

ipAddrEntry.2.X.X.X.X = 32

=====================================

Is there any fix for this problem.

Thanks

[deilert]

what is your code ? I know of a bug that relates to snmp & high CPU CSCdv16386 & CSCdm32924

[Craig Norborg]

Its very common for CPU to go high when somethings reading the routing table on a router. You can limit what SNMP can view by using a view.

The basic sytax is something like this:

snmp-server view cutdown internet included

snmp-server view cutdown at excluded

snmp-server view cutdown ip.21 excluded

snmp-server view cutdown ip.22 excluded

snmp-server community READCOMM view cutdown RO

More info can be found here...

http://www.cisco.com/warp/public/477/SNMP/ipsnmphighcpu.shtml