Can the Catalyst 4500/4000 switches that run CatOS mark or rewrite IP precedence Type of Service (ToS) bits in an IP packet?
A. Catalyst 4500/4000 switches that run CatOS do not provide Layer 3 (L3) marking or rewriting on Layer 2 (L2) ports. The L3 ToS bits of an incoming packet are passed through the L2 switch untouched. The incoming IP precedence on L3 module Gigabit Ethernet interfaces is honored. Refer to the Installation and Configuration Note for the Catalyst 4000 Layer 3 Services Module for additional information. Marking and rewriting of IP precedence/differentiated services code point (DSCP) is supported in a Catalyst 4500/4000 that runs Cisco IOS Software. For more information, refer to the document QOS Policing and Marking with Catalyst 4000/4500 IOS-Based Supervisor Engines.
Related Questions
- Can the Catalyst 4500/4000 switches that run CatOS change the incoming Class of Service (CoS) value in IEEE 802.1Q (dot1q) tags?
- Can the Catalyst 2950 series switches mark or rewrite IP precedence (type of service [ToS]) bits in an IP packet?
- What kind of output scheduling do the Catalyst 4500/4000 switches that run CatOS provide?
