We have a Cisco Catalyst 6500 with a FWSM running V 4.0(6)
We have noticed that when we apply new rules into the ACL (through ASDM or CLI) that after the ACL is applied,
the CPU sits very high (90-100%) for up to 20 min.
During this time, the new rules you have entered into the ACL, do not work, until the CPU drops back to normal baseline usage which is about 10%, after about 20 min or so...
Looking at CPUHOG during this time, doesnt give us an indication about what is happening..