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6509 Chasis show very high CPU Utilization (99%)


My CISCO 6509 Chasis shows very high CPU utilization.

When I see the processes running, L3 aging process is causing the problem.

sh proc cpu

CPU utilization for five seconds: 98.40%

one minute: 99.00%

five minutes: 99.00%

PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process

--- ----------- ---------- -------- ------- ------- ------- --- ---------------

29 606447394 47914416 112000 96.26% 96.00% 96.00% 0 L3Aging

Can any body tell what is this process and how to solve the problem.

Thanks in advance

Cisco Employee

Re: 6509 Chasis show very high CPU Utilization (99%)

Is your routing stable? A quick check would be to look at 'sh ip ro sum' a few times to see if routes changing. Is your mls stable? On the supervisor look at total routes in 'sh mls' to see if changing. Are you running NDE? You may want to take this info and open a TAC case.

New Member

Re: 6509 Chasis show very high CPU Utilization (99%)


Thanks for your info.

1.Routing table is stable.(We are not running any dynamic routing) It is just an access switch.

2.MLS is enabled in this box. ip route summ

IP routing table name is Default-IP-Routing-Table(0)

Route Source Networks Subnets Overhead Memory (bytes)

connected 3 5 512 1152

static 3 3 384 864

internal 4 4656

Total 10 8 896 6672 mls

Total packets switched = 22089319768

Total bytes switched = 5667335769834

Total routes = 210

IP statistics flows aging time = 304 seconds

IP statistics flows fast aging time = 0 seconds, packet threshold = 0

IP Current flow mask is Full flow

Netflow Data Export version: 7

Netflow Data Export enabled

Netflow Data Export configured for port 9996 on host

Destination filter is

Filter type: exclude

Total packets exported = 44903989

IPX statistics flows aging time = 304 seconds

IPX flow mask is Destination flow

IPX max hop is 255

Module 15: Physical MAC-Address 00-d0-04-ef-4b-fc

Vlan Virtual MAC-Address(es)

---- -----------------------

2 00-00-0c-07-ac-02

100 00-00-0c-07-ac-64

New Member

Re: 6509 Chasis show very high CPU Utilization (99%)


The problem got resolved after changing the MLS filter

from destination to source


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