I want to depoly 5 ESW 540-24 PoE switches in a network with depolyment of Polycom IP phones.
As you know these switches come with QoS preconfigured for deployment of IP phones.
Now I have general questions regarding advance QoS configuration done by Cisco as preconfigured.
The first question is that why in the "CoS to Queue" page settings the CoS value 0 and 1 is mapped to queue class 4 and CoS value 5 is mapped to queue calss of 1?
As we know the queue class 4 does have the highest priority than 1, and CoS value 5 is from the IP phone for the voice RTP traffic which in this settings is mapped to queue class 1 which it does have the lowest priority. In addition, the CoS value 3 is mapped to queue class 2 which this CoS is set by IP phones for the voice singaling traffic.
The second question is, in the QoS to queue page under general section the WRR queuing is set and not Strict Queuing which as we know Cisco has recommend in its CCNP ONT book that for deployment of IP phones in a giving network the LLQ queuing has to be used and not WRR.
The thrid question is, in the "DSCP to Queu" page why the DSCP 46 is set to queue 1 which this value is set by an IP phone for its RTP traffic. And why DSCP 26 is set to queue 2 which is the value set by an IP phone when sends its signaling traffic toward the switch.
The fourth question is, why in the "DSCP Mapping" page under Advance section the DSCP 26 & 46 mapped to 0 under "DSCP Out" section.
I have checked the Admin documents, but there is no general guide line for VOIP traffic configuration and there is no documents/configuration sample on the Cisco web page for deployment of IP phones.