Command Reference Guide

1184 | Quality of Service (QoS)
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Usage
Information
Once a unicast queue is configured as strict-priority, that particular queue, on the entire
chassis, is treated as strict-priority queue. Traffic for a strict priority is scheduled before any
other queues are serviced. For example, if you send 100% line rate traffic over the SP queue,
it will starve all other queues on the ports on which this traffic is flowing.
Policy-Based QoS Commands
Policy-based traffic classification is handled with class maps. These maps classify unicast
traffic into one of eight classes in E-Series and one of four classes in C-Series, S-Series and
. FTOS enables you to match multiple class maps and specify multiple match criteria.
Policy-based QoS is not supported on logical interfaces, such as port-channels, VLANS, or
loopbacks. The commands are:
• bandwidth-percentage
• bandwidth-weight
• class-map
• clear qos statistics
• description
• match ip access-group
• match ip dscp
• match ip precedence
• match mac access-group
• match mac dot1p
• match mac vlan
• policy-aggregate
• policy-map-input
• policy-map-output
• qos-policy-input
• qos-policy-output
• queue backplane ignore-backpressure
• queue egress
• queue ingress
• rate-limit
• rate-police
• rate-shape
• service-policy input
• service-policy output
• service-queue
Version 7.5.1.0 Introduced on C-Series
pre-Version 6.1.1.1 Introduced on E-Series