Can the Catalyst 4500/4000 switches that run CatOS change the incoming Class of Service (CoS) value in IEEE 802.1Q (dot1q) tags?
A. No. The Catalyst 4500/4000 switches that run CatOS support frame classification and marking only on unclassified frames entering the switch and cannot change CoS values on already tagged packets. Catalyst 4500/4000 switches that run Cisco IOS Software can classify or reclassify tagged/untagged packets. For more information, refer to the document Understanding and Configuring QoS.
Related Questions
- Can the Catalyst 4500/4000 switches that run CatOS extend the trust or override the incoming Class of Service (CoS) value of devices connected to the IP phones?
- Do the Catalyst 4500/4000 switches that run CatOS honor the incoming Class of Service (CoS) value in IEEE 802.1Q (dot1q) tags from my IP phones?
- Do the Catalyst 2950 series switches honor the incoming class of service (CoS) values in IEEE 802.1p (dot1p) tags from IP phones?
