Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 819
Allocating Bandwidth to Multicast Queues, Pre-calculating Available QoS CAM Space
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Allocating Bandwidth to Multicast Queues e Allocating Bandwidth to Multicast Queues is supported on platform: The E-Series has 128 multicast queues per port-pipe, which are transparent, and eight unicast queues per port. You can allocate a specific bandwidth percentage per port-pipe to multicast traffic using the command queue egress multicast bandwidth-percentage from CONFIGURATION mode. • If you configure bandwidth-percentage for unicast only, 1/8 of the port bandwidth is reserved for multicast, and the remaining bandwidth is distributed based on your configuration. • If you configure multicast bandwidth, after assigning the specified amount of bandwidth to multicast the remaining bandwidth is distributed according to the WFQ algorithm. • If you configure bandwidth-percentage for both unicast and multicast, then bandwidth is assigned based on your configuration for multicast then unicast (based on the remaining available bandwidth), and the remaining bandwidth is distributed among the other queues. For example, if you configure 70% bandwidth to multicast, 80% bandwidth to one queue in unicast and 0 % to all remaining unicast queues, then first, FTOS assigns 70% bandwidth to multicast, then FTOS derives the 80% bandwidth for unicast from the remaining 30% of total bandwidth. Pre-calculating Available QoS CAM Space c e s Pre-calculating Available QoS CAM Space is supported on platforms: Before version 7.3.1 there was no way to measure the number of CAM entries a policy-map would consume (the number of CAM entries that a rule uses is not predictable; 1 to 16 entries might be used per rule depending upon its complexity). Therefore, it was possible to apply to an interface a policy-map that requires more entries than are available. In this case, the system writes as many entries as possible, and then generates an CAM-full error message (Message 1). The partial policy-map configuration might cause unintentional system behavior. Message 1 QoS CAM Region Exceeded %EX2YD:12 %DIFFSERV-2-DSA_QOS_CAM_INSTALL_FAILED: Not enough space in L3 Cam(PolicyQos) for class 2 (Gi 12/20) entries on portpipe 1 for linecard 12 %EX2YD:12 %DIFFSERV-2DSA_QOS_CAM_INSTALL_FAILED: Not enough space in L3 Cam(PolicyQos) for class 5 (Gi 12/22) entries on portpipe 1 for linecard 12 The command test cam-usage enables you to verify that there are enough available CAM entries before applying a policy-map to an interface so that you avoid exceeding the QoS CAM space and partial configurations. This command measures the size of the specified policy-map and compares it to the available CAM space in a partition for a specified port-pipe. Quality of Service | 819
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