If I understand it correctly on a switch port that has an IP phone plugged into it the command "switchport priority extend cos 0" would ensure that the PC traffic was set to COS 0.
But what if this command was applied to my layer 2 WAN interface? Would all traffic (including voice) be re-mapped to COS 0? That?s the way my WAN interface is currently configured and I don't know why.
The command is only relevant for Cisco IP Phones - if there is no phone connected the command won't do anything. I recall it sets some kind of flag in CDP to communicate with the phone so you need a Cisco IP phone and CDP enabled for it to have any effect.
As to why you have it on your WAN interface - maybe the port once had a phone attached?
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...