Certain divisions of the company tend to shoot themselves in the foot by kicking off large file transfers during business hours, so I had a thought that maybe we could use time-based ACLs to do some QoSing for those guys. I fired up GNS3 with a 3600 running 12.4(25b) with some virtual PCs on it’s Ethernet interfaces.

time-range BUSINESSHOURS
 periodic daily 8:00 to 17:00
!
ip access-list extended PINGS
 permit icmp any any time-range BUSINESSHOURS
!
class-map match-all PINGS
 match access-group name PINGS
!
policy-map PM-F0/0-OUT
 class PINGS

First, I set the router’s time to outside of the time range and sent some pings over.