Simple query: What queues are involved in the output of a packet from a router?
Specifically: When applying a service policy for output packets one can choose such as CBWFQ or PQ or CQ etc. Once the policy has done its queuing/queueing what happens with the packet? Does it immediately get lined up for the transmit ring or does it then also go through the queueing for the interface and only then go to the transmit ring?
Or does it depend on the architecture of the specific router model or family? I'm confused as to the details and cannot find an answer on Cisco's site.
The reason for asking is that some recent IOS versions don't allow the class-default to have fair-queueing applied. We have fair queueing on the interface itself but from customer reports traffic in the default class seems to NOT get fair queue treatment. I can't find out if this is right or not so any pointers would be appreciated.
-- TIA, James