Quality of Service Guide QoS and QoS Policies
Edition: 01 3HE 11014 AAAC TQZZA 99
The scheduler mode is set at the interface level in the config>port>ethernet>
network context. The encapsulation type for an 8-port Ethernet Adapter card in
profiled scheduling mode or 4-priority scheduling mode can be either null or dot1q.
3.4.3.4 Network Egress 16-Priority Scheduling
The adapter cards and ports that support 16-priority scheduling for network egress
traffic are listed in Table 10. This type of scheduling takes into consideration the
traffic’s profile type and the priority of the CoS queue that the traffic is coming from.
Packets less than or up to the CIR are scheduled as in-profile. Packets that arrive at
rates greater than the CIR, but less than the PIR, are scheduled as out-of-profile.
Eight CoS queues in total are available for packets to go through.
In-profile traffic is exhaustively transmitted from the queues, starting with the
highest-priority CoS queue. A strict priority is applied between the eight CoS queues.
If a packet arrives at a queue of higher priority than the one being serviced, the
scheduler services the packet at the higher-priority queue as soon as it finishes
servicing the current packet.
Once all the in-profile traffic is transmitted, the out-of-profile traffic is transmitted, still
maintaining priority of the queues. If an in-profile packet arrives and the scheduler is
servicing an out-of-profile packet, the scheduler finishes servicing the out-of-profile
packet and then immediately services the in-profile packet.
The order of priority in the default configuration is as follows:
• CoS-8 in-profile traffic
• CoS-7 in-profile traffic
• CoS-6 in-profile traffic
• CoS-5 in-profile traffic
• CoS-4 in-profile traffic
• CoS-3 in-profile traffic
• CoS-2 in-profile traffic
• CoS-1 in-profile traffic
• CoS-8 out-of-profile traffic
• CoS-7 out-of-profile traffic
• CoS-6 out-of-profile traffic
• CoS-5 out-of-profile traffic
• CoS-4 out-of-profile traffic
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