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The 7600, I believe, uses actual internal CoS markings for directing traffic to egress queues, but also believe you can map various DSCP markings into the internal CoS markings. I.e., you can indirectly prioritize based on DSCP. (I think something similar is possible if using MPLS EXP markings.)
Correct, the 6724 card doesn't support LLQ or bandwidth, but you can define on of the queues to be a priority queue, to take the role of LLQ, and other queues can be assigned weight (effectively giving them ratios like the CBWFQ bandwidth statement). Compared to a 7200, you only have 4 queues to work with, and the LLQ like PQ doesn't offer an implicit policer.
