High CPU utilzation on 3750switch

[ikbalc]

Hi,

We are facing high CPU utilization on 3750 due to the process hl3mm.Please find the output of show process cpu sorted,show process cpu and show version attached here.

Please help

Ikbal

[Mahesh Gohil]

Hi Ikbal,

Please confirm do you see any log message while your cpu is high ? If no message best way it to log case with cisco as i do not find any bug

related to hl3mm process.

In addition please check duplex mode on switch for all the ports. This cause high cpu because multiple users passing traffic to a port

with half duplex operation

you can share switch config which might be helpful to know the exact reason

Regards

Mahesh

[fryazinosab]

To resolve this situation (not to receive any extra traffic from users), you can create ACL and apply it to all VLAN, which should work IPTV.  Let the multicast channels are located in range 225.1.1.1 to 225.1.1.255, and nothing but them we do not need.

ip access-list extended PreventMulticastDoS

permit ip any 225.1.1.0 0.0.0.255

deny ip any 224.0.0.0 15.255.255.255

permit ip any any

int vlan 101

ip access-group PreventMulticastDoS in

'igmp filter' for this case does not work -- mroute table still overflow. The same applies to the 'ip igmp access-group'