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Cisco Systems, Inc.
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QoS
Advanced QoS • 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/UDP port number.
• Cisco control-plane and data-plane QoS ACLs on all ports help to ensure proper marking
on a per-packet basis.
• 4 egress queues per port enable differentiated management of up to 4 traffic types
• Shaped Round Robin scheduling helps to ensure differential prioritization of packet flows
by intelligently servicing the ingress and egress queues.
• Weighted Tail Drop (WTD) provides congestion avoidance at the ingress and egress
queues before a disruption occurs.
• Strict priority queuing guarantees that the highest-priority packets are serviced ahead of
all other traffic.
• There is no performance penalty for highly granular QoS functions. Granular rate limiting
• The Cisco Committed Information Rate (CIR) function guarantees bandwidth in
increments as low as 8 Kbps.
• Rate limiting is provided based on source and destination IP address, source and
destination MAC address, Layer 4 TCP/UDP information, or any combination of these
fields, using QoS ACLs (IP ACLs or MAC ACLs), class maps, and policy maps.
• Asynchronous data flows upstream and downstream from the end station or on an uplink
are easily managed using ingress policing and egress shaping.
• Up to 64 aggregate or individual policers per Gigabit Ethernet port are allowed.
Table 1 Product Features and Benefits (Continued)
Feature Benefit