Very high CPU utilisation on Cat6509 layer three module.
I have three MSM modules in Cat6509s which occasionally reach 99% utilisation. One of these modules only sits on VLAN1 as a host (does not participate in routing - ie a spare unit) The only thing that I can think of which would cause the high utilisation is broadcast/flooded network traffic.
Although the router is only configured to process VLAN1 packets the switch has all vlans enabled on the internal trunk link to the MSM - This allows multiple packets to enter the router, even though they are not to be processed.
Our company utilises the Microsoft WLBS method of HA between application servers on one of the VLANs on the switch - this can cause up to 3,000 packets per second/25Mbps to flood into all the MSM modules (WBLS uses a nonexistant virtual destination MAC address for the HA server cluser which does not exist in the CAM tables of the switches causing all traffic to flood).
The question I have is - is this flooded traffic enough to cause problems for the router, even though the router should discard them or would there be another reason for the high CPU values. An expample of the show proc cpu is given below:
Europa# sh proc cpu
CPU utilization for five seconds: 97%/76%; one minute: 86%; five minutes: 47%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
Re: Very high CPU utilisation on Cat6509 layer three module.
You might want to turn netflow on temporarily to see what is generating all the traffic , possible you may have infected hosts on network . Doubt The servers would cause any major problems we have those on our our network and they don't bother the 6509's at all though we run MSFC2 instead of the old MSM's .
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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