Quality of Service Guide QoS and QoS Policies
Edition: 01 3HE 11014 AAAC TQZZA 29
The traffic flows of different forwarding classes are mapped to the queues. This
mapping is user-configurable. Each queue has a unique priority. Packets from
high-priority queues are scheduled separately, before packets from low-priority
queues. More than one forwarding class can be mapped to a single queue. In such
a case, the queue type defaults to the priority of the lowest forwarding class (see
Queue Type for more information on queue type). By default, the following logical
order is followed:
• FC-8 - NC
• FC-7 - H1
•FC-6 - EF
• FC-5 - H2
•FC-4 - L1
•FC-3 - AF
•FC-2 - L2
•FC-1 - BE
At access ingress, traffic can be classified as unicast traffic or one of the multipoint
traffic types (broadcast, multicast, or unknown (BMU)). After classification, traffic can
be assigned to a queue that is configured to support one of the four traffic types,
namely:
• unicast (or implicit)
• broadcast
•multicast
• unknown
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