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FTOS Configuration Guide for the C-Series - Force10 Networks

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• Allocate a specific bandwidth percentage to a queue using <strong>the</strong> command bandwidth-percentage from<br />

QOS-POLICY-OUT mode.<br />

For multicast queues you can allocate a specific bandwidth percentage per port-pipe to multicast traffic<br />

using <strong>the</strong> command queue egress multicast bandwidth-percentage from CONFIGURATION mode.<br />

If you configure bandwidth-percentage <strong>for</strong> unicast only, 1/8 of <strong>the</strong> port bandwidth is reserved <strong>for</strong> multicast,<br />

and <strong>the</strong> remaining bandwidth is distributed based on your configuration.<br />

If you configure multicast bandwidth (globally), <strong>the</strong>n after assigning <strong>the</strong> specified amount of bandwidth to<br />

multicast <strong>the</strong> remaining bandwidth is distributed according to <strong>the</strong> WFQ algorithm.<br />

If you configure bandwidth-percentage <strong>for</strong> both unicast and multicast, <strong>the</strong>n bandwidth is assigned based on<br />

your configuration <strong>for</strong> multicast and unicast and <strong>the</strong> remaining bandwidth is distributed among <strong>the</strong> o<strong>the</strong>r<br />

queues.<br />

Points to Remember<br />

• The queue egress multicast command works with multicast bandwidth configured only if <strong>the</strong> total<br />

unicast bandwidth is more than <strong>the</strong> multicast bandwidth.<br />

• If strict priority is applied along with multicast bandwidth, <strong>the</strong> effect of strict priority is on all ports<br />

where unicast and multicast bandwidth are applied.<br />

• When multicast bandwidth is assigned along with unicast bandwidth, first multicast bandwidth is<br />

reserved <strong>for</strong> that port, <strong>the</strong>n <strong>the</strong> remaining unicast bandwidth configured is adjusted according to <strong>the</strong><br />

bandwidth available after reserving <strong>for</strong> multicast.<br />

• On 10 Gigabit line cards, if <strong>the</strong> number of cells in <strong>the</strong> IWFQ table assigned to multicast is greater than<br />

<strong>the</strong> unicast queues, <strong>the</strong>n <strong>the</strong> bandwidth assignment does not take effect.<br />

• Strict priority applied to one unicast queue affects traffic on ano<strong>the</strong>r unicast queue of ano<strong>the</strong>r port in<br />

<strong>the</strong> same port pipe with multicast bandwidth.<br />

• If two egress ports are in <strong>the</strong> same port-pipe and have multicast and unicast bandwidth applied to one<br />

port only, traffic is not predictable on <strong>the</strong> o<strong>the</strong>r port.<br />

• Unicast and multicast traffic is not calculable <strong>for</strong> jumbo frames.<br />

• After sending multicast and unicast traffic with jumbo frames and stopping multicast traffic,<br />

bandwidth <strong>for</strong> unicast not to take effect.<br />

• With bidirectional multicast traffic, bandwidth is affected.<br />

Pre-calculating Available QoS CAM Space<br />

Pre-calculating Available QoS CAM Space is supported only on plat<strong>for</strong>ms c e<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 577

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