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100% CPU usage on a Catalyst 6509 VSS

Hi all

One of my Catalyst 6509 VSS duo has for the last 24 hours been running with 100 % CPU usage:

I am not able to Telnet og SSH to the router, but console cable still works.

Runing IOS is sup-bootdisk:s72033-adventerprisek9-vz.122-33.SXI4.bin

As seen in the "show proc cpu" output inetd.proc, tcp.proc and ios.base takes up almost all of the CPU.

r-log-osls-s24-5-1#sho proc cpu | exclude 0.0%

CPU utilization for five seconds: 100%/31%; one minute: 100%; five minutes: 100%

PID       5Sec    1Min     5Min Process

1         0.1%    0.2%     0.3% kernel

16406    58.3%   61.4%    61.9% ios-base

16427     1.3%    1.2%     1.1% raw_ip.proc

16428    14.9%   15.3%    15.2% inetd.proc

16429    12.7%   12.8%    12.6% tcp.proc

16430     7.7%    7.2%     7.2% udp.proc

16431     2.9%    2.0%     1.9% iprouting.iosproc

16432     1.0%    1.0%     1.0% cdp2.iosproc


The ios-base usage I can understand since the IOS is modular base. But inetd.proc and tcp.proc I cannot understand.

I have cleared all hanging TCP sessions and issued the "undebug all" command but still no progress.

The system have been stable for over 3 years now, and no changes was made to the configuration at the time th CPU usage stared rising.

Thanks in advance




An udate to this issue.

"clear tcp tcb *" got the cpu usage to an acceptable level. But as soon as I try to SSH or Telnet to the router the CPU usage spikes again. And the inetd.proc and the tcp.proc are the processes with increased usage.


Everyone's tags (3)

100% CPU usage on a Catalyst 6509 VSS

Could be an issue with modular code. Similar behavior was seen in this thread:

I would open a TAC case if you didn't already do that.

Daniel Dib CCIE #37149 Please rate helpful posts.