QoS and QoS Policies
94
Quality of Service Guide
3HE 11014 AAAC TQZZA Edition: 01
3.4 Network Egress
This section contains the following topics for traffic flow in the network egress
direction:
• BMU Traffic at Network Egress
• Network Egress Queuing Aggregation
• Network Egress Scheduling
• Network Egress Shaping
• Network Egress Shaping for Hybrid Ports
• Network Egress Per-VLAN Shapers
• Network Egress Marking and Re-Marking
3.4.1 BMU Traffic at Network Egress
BMU traffic at network egress is handled in the same way as unicast traffic in terms
of scheduling, queuing, or port-level shaping. Both unicast and BMU traffic are
mapped to queues as per the FC markings. Traffic from these queues, whether
unicast or BMU, is scheduled according to user-configured rates. Port-level shapers
treat all the queues identically, regardless of traffic type.
3.4.2 Network Egress Queuing Aggregation
After traffic is switched through the fabric from one or several access ingress adapter
cards to a network egress adapter card, queuing-level aggregation on a
per-forwarding-class basis is performed on all of the received packets.
An adapter card that is used for network egress can receive—and will likely
receive—packets from multiple adapter cards that are configured for access ingress
operations, and from the CSM. Adapter cards that are configured for network access
permit user configuration of queues and the association of forwarding classes to the
queues. These are the same configuration principles that are used for adapter cards
that are configured for access ingress connectivity. Like access ingress, more than
one forwarding class can share the same queue.
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