What is the software version requirement for the QoS features on Catalyst 2950 series switches?
A. The 2950 supports egress queuing and scheduling based on IEEE 802.1p class of service (CoS) values with Cisco IOS® Software Release 12.0(5)WC(1) and later. Each port on the switch gets a default priority value. Frames that are received untagged are assigned this value. For those frames that are received tagged, the 2950 uses the value in the tag. The 2950 queues frames at the egress port into one of four priority queues. The switch makes the queue assignments on the basis of the priority or CoS value that is assigned to the frame at ingress. You can configure egress scheduling as either strict priority or weighted round-robin (WRR) scheduling. The Catalyst 2950 series switches run two feature sets of Cisco IOS Software, a standard image (SI) and an enhanced image (EI). Several feature differences exist between the SI version and the EI version. The SI only supports the output scheduling QoS features, whereas the EI adds support for classification, marking, and policing. Refer to the
