Dell Force10 E1200i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 802
Con Port-based Rate Shaping
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www.dell.com | support.dell.com Configure Port-based Rate Shaping Rate shaping buffers, rather than drops, traffic exceeding the specified rate until the buffer is exhausted. If any stream exceeds the configured bandwidth on a continuous basis, it can consume all of the buffer space that is allocated to the port. Apply rate shaping to outgoing traffic on a port using the command rate shape from INTERFACE mode, as shown in the example below. FTOS Behavior: Rate policing is supported only on physical port interfaces; it is not supported on port-channel and VLAN interfaces. - On ExaScale, when rate shaping is configured on an interface, the "Dropped Packets" counter in the outputs of show queue statistics egress and show qos statistics wred-profile does not increment. This is because, while TeraScale systems maintain QoS counters per interface, ExaScale systems maintain QoS counters per port-pipe. The matched packets counter, however, increments as expected. - On ExaScale 10G line cards, the granularity for rate shaping is 10Mbps so traffic is not always rate shaped according to the configured value. Specifically, if the configured value is below 5Mbps or a multiple of 5: for values less than 5Mbps, 0Mbps is received at remote end, and for values greater than or equal to 5Mbps, the remote end receives the next highest increment of 10; 15Mbps, for example, is rate shaped to 20Mbps. FTOS#config FTOS(conf)#interface gigabitethernet 1/0 FTOS(conf-if)#rate shape 500 50 FTOS(conf-if)#end FTOS# 802 | Quality of Service
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