Quality of Service Guide QoS and QoS Policies
Edition: 01 3HE 11014 AAAC TQZZA 113
3.6 Access Egress
This section contains the following topics for traffic flow in the access ingress
direction:
• Access Egress Queuing and Scheduling
• Access Egress Per-SAP Aggregate Shapers (Access Egress H-QoS)
• Access Egress Shaping for Hybrid Ports
• Access Egress for 4-Priority (Gen-3) Scheduling
• Access Egress Marking/Re-Marking
• Packet Byte Offset (PBO)
3.6.1 Access Egress Queuing and Scheduling
The following sections discuss the queuing and scheduling of access egress traffic,
which is traffic that egresses the fabric on the access side:
• BMU Traffic Access Egress Queuing and Scheduling
• ATM Access Egress Queuing and Scheduling
• Ethernet Access Egress Queuing and Scheduling
Access egress scheduling takes place at the native traffic layer. As an example, once
the ATM pseudowire payload is delivered from the network ingress to the access
egress, the playback of the ATM cells to the appropriate ATM SAP is done according
to ATM traffic management specifications.
Access egress scheduling is supported on the adapter cards and ports listed in
Table 13. The supported scheduling modes are 4-priority and 16-priority. Table 13
shows which scheduling mode each card and port supports at access egress.
Note: For access ingress and egress, the 16-priority schedulers use additional hardware
resources and capabilities, which results in increased throughput.
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