Sometimes your Cisco 6500 seems to having a hard time with high CPU. Most cases are pretty obvious, like rancid or librenms runs, arp or dhcpd storms. But sometimes it is not that obvious and you want to know which traffic flows to your CPU. Time to dump the packets to the CPU. The following has been retrieved from cisco.com. Please note that the SUP2T has no support for this (source)!
Cisco IOS Release 12.2(18)SXF
switch#monitor session 1 source interface <mod/port> !Use any dummy interface that is administratively shut down. switch#monitor session 1 destination interface <mod/port> switch#remote login switch switch-sp#test monitor add 1 rp-inband tx
Cisco IOS Releases 12.2(33)SXH and later
switch(config)# monitor session 1 type local switch(config-mon-local)# source cpu rp tx switch(config-mon-local)# destination interface <mod/port> switch(config-mon-local)# no shut
This configuration mirrors traffic on the SP-RP inband path, and diverts it to the destination interface. Connect a PC on the destination interface, and start the sniffer application (Wireshark, for example) in order to capture traffic received on the Network Interface Card (NIC).