Dell PowerConnect M6220 Configuration Guide - Page 110
Egress Port Configuration-Traffic Shaping, Queue configuration, Queue Management Type, CLI Examples
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CoS Mapping Table for Trusted Ports Mapping is from the designated field values on trusted ports' incoming packets to a traffic class priority (actually a CoS traffic queue). The trusted port field-to-traffic class configuration entries form the Mapping Table the switch uses to direct ingress packets from trusted ports to egress queues. Egress Port Configuration-Traffic Shaping For unit/slot/port interfaces, you can specify the shaping rate for the port, which is an upper limit of the transmission bandwidth used, specified as a percentage of the maximum link speed. Queue configuration For each queue, you can specify: • Minimum bandwidth guarantee • Scheduler type - strict/weighted: Strict priority scheduling gives an absolute priority, with highest priority queues always sent first, and lowest priority queues always sent last. Weighted scheduling requires a specification of priority for each queue relative to the other queues, based on their minimum bandwidth values. • Queue management - tail drop Queue Management Type The switch supports the tail drop method of queue management. This means that any packet forwarded to a full queue is dropped regardless of its importance. CLI Examples Figure 7-1 illustrates the network operation as it relates to CoS mapping and queue configuration. Four packets arrive at the ingress port 1/g10 in the order A, B, C, and D. You've configured port 1/g10 to trust the 802.1p field of the packet, which serves to direct packets A, B, and D to their respective queues on the egress port. These three packets utilize port 1/g10's 802.1p to COS Mapping Table. In this case, the 802.1p user priority 3 was set up to send the packet to queue 5 instead of the default queue 3. Since packet C does not contain a VLAN tag, the 802.1p user priority does not exist, so Port 1/g10 relies on its default port priority (2) to direct packet C to egress queue 1. 110 Quality of Service
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