Data Sheet
© 2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 10 of 21
QoS and Control
Advanced QoS
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Standard 802.1p CoS and DSCP field classification are provided, using marking and
reclassification on a per-packet basis by source and destination IP address, source and
destination MAC address, or Layer 4 TCP or UDP port number.
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Cisco control-plane and data-plane QoS ACLs on all ports help ensure proper marking on a
per-packet basis.
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Four egress queues per port enable differentiated management of up to four traffic types.
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SRR scheduling ensures differential prioritization of packet flows by intelligently servicing the
ingress and egress queues.
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Weighted tail drop (WTD) provides congestion avoidance at the ingress and egress queues
before a disruption occurs.
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Strict priority queuing guarantees that the highest-priority packets are serviced ahead of all
other traffic.
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There is no performance penalty for highly granular QoS functions.
Granular Rate Limiting
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The Cisco CIR function guarantees bandwidth in increments as small as 1 Mbps.
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Rate limiting is provided based on source and destination IP address, source and destination
MAC address, Layer 4 TCP and UDP information, or any combination of these fields, using
QoS ACLs (IP ACLs or MAC ACLs), class maps, and policy maps.
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Asynchronous data flows upstream and downstream from the end station or on the uplink are
easily managed using ingress policing and egress shaping.
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Up to 64 aggregate or individual polices are available per Fast Ethernet or Gigabit Ethernet
port.
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