I'm trying to muddle my way through the Cisco 3850 (WS-C3850-48P) MQC configuration (wired only, nothing wireless-related) and I ran into some questions.
Some technical documentation says that the switch has 8 queues on wired interfaces. However, I've had little luck finding out the exact configuration of these queues, or whether they are configured according to policies. (1P7Q?T?) Is that entire nomenclature and design obsoleted by hierarchical QoS?
Also,
show interfaces gigabitEthernet 1/0/48 capabilities
says:
tx-(4q3t) (3t: Two configurable values and one fixed.)
which directly contradicts the claim of 8 queues? Is this a display bug, or have I fundamentally misunderstood the queue architecture?
When I define 8 class-maps, as inspired by the QoS SRNDs (both 2005 and 4.0), and use a policy-map to assign these classes to queues (1 priority, 7 others) I get:
Jun 18 10:46:25.276: Policy <policy-name> rejected:Has more than 7 user defined classes
Any quidance what non-user defined classes there are, and what the queueing settings for these are? Alternatively, is there an SRND suggestion what to do with a switch that has 7 queues (1P6Q?), or how to configure the 3850 in general to conform to the SRN design?
Finally, are there useful troubleshooting commands aside from "show policy-map interface <interface>" to help in understanding what DSCP/CoS values the switch is seeing and queueing, and how a given interface is configured?
