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High CPU in Cisco switch

Hi all,

   Kindly help me to get resolve high cpu to interrupt.I am getting lots of input que drops in all vlan interfaces.I have enabled multicast in all vlan interfaces.

System image file is "sup-bootdisk:s72033-advipservicesk9_wan-mz.122-33.SXI4a.bin"

sh ip cef switching statistics

       Reason                          Drop       Punt  Punt2Host

RP LES No route                    19984062          0       9065

RP LES Packet destined for us             0   50606680          0

RP LES Encapsulation resource             0          8          0

RP LES No adjacency                16044658          0          0

RP LES Unresolved route                1010          0          0

RP LES Bad checksum                       1          0          0

RP LES TTL expired                        0          0  136724631

RP LES Fragmentation failed              39          0          0

RP LES IP redirects                       0          0       4588

RP LES Unclassified reason           114998          0          0

RP LES Neighbor resolution req     11975033        325          0

RP LES Total                       48119801   50607013  136738284

All    Total                       48119801   50607013  136738284



High CPU in Cisco switch


Please check for sh processes cpu sorted for higly utilized event.

Also please check for sh interface counters nonzero if there is any particular user who is creating huge traffic / loops which is causing the cpu process to go down.

Also check in sh logging to find any port which makes continious violation.

I hope with this you can sort out the  problem.

Also you need to have a proper Qos if you much priority traffic to go out without any issue.

Please do rate if the given information helps.



Hall of Fame Super Bronze

High CPU in Cisco switch

Here is a list of reason why a multicast packet would be punted to the CPU:

I often see TTL set to 1 as the most common condition.

You mentioned you enabled multicast on all Vlans, can you provide the configuration from the switch along with the output from 'show ip mroute' ?