Qos switches



Keywords: qos switches
Description: This document addresses the Frequently Asked Questions (FAQs) on the Quality of Service (QoS) features of the Cisco Catalyst 2950 series switches.

This document addresses the Frequently Asked Questions (FAQs) on the Quality of Service (QoS) features of the Cisco 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 Release Notes for the Catalyst 2955, Catalyst 2950, and Catalyst 2940 Switches, Cisco IOS Release 12.1(22)EA4 for hardware and software compatibility.

A. The 2950 with the SI supports queuing and scheduling at egress. The 2950 with SI supports ingress classification with use of port trust states in Cisco IOS Software Release 12.1(11)EA1 and later. You can configure the ingress port to trust either class of service (CoS) or differentiated services code point (DSCP), where the default port trust state is untrusted. You can configure egress scheduling as either strict priority scheduling or weighted round-robin (WRR) scheduling.

In Cisco IOS Software Releases 12.0, SI only supports configuration on CoS priorities and WRR. In Cisco IOS Software Releases 12.1 and later, SI added these features:






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