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Control
Advanced Quality of Service
• This feature enables end-to-end QoS in the network by extending the QoS trust boundary to the edge of the network.
• The switches support the aggregate QoS model by enabling classification, policing/metering, and marking functions on
a per-port basis at ingress and queuing/scheduling function at egress.
• The switches support configuring QoS ACPs on all ports to ensure proper policing and marking on a per-packet basis
using ACPs. Up to four ACPs per switch are supported in configuring either QoS ACPs or security filters.
QoS Classification Support at Ingress
• The switches support QoS classification of incoming packets for QoS flows based on Layer 2, Layer 3, and Layer 4 fields.
• The following Layer 2 fields or a combination can be used for classifying incoming packets to define QoS flows: source
MAC address, destination MAC address, 16-bit Ethertype.
• The following Layer 3 and 4 fields or a combination can be used to classify incoming packets to define QoS flows: source
IP address, destination IP address, TCP source or destination port number, UDP source or destination port number.
QoS Metering/Policing at Ingress
• Support for metering/policing of incoming packets restricts incoming traffic flows to a certain rate.
• The switches support up to 6 policers per Fast Ethernet port, and 60 policers on a Gigabit Ethernet port.
• The switches offer granularity of traffic flows at 1 Mbps on Fast Ethernet ports, and 8 Mbps on Gigabit Ethernet ports.
QoS Marking at Ingress
• The switches support marking/re-marking packets based on state of policers/meters.
• The switches support marking/re-marking based on the following mappings: from differentiated service code point
(DSCP) to 802.1p, and 802.1p to DSCP.
• The switches support 14 well-known and widely used DSCP values.
• The switches support re-classifying packets based on default DSCP per port.
• The switches support (re)classifying frames based on default 802.1p value per port.
• The switches support 802.1p override at ingress.
QoS Scheduling Support at Egress
• Four queues per egress port are supported in hardware.
• The Weighted Round Robin (WRR) queuing algorithm ensures that low-priority queues are not starved.
• Strict-priority queue configuration ensures that time-sensitive applications such as voice always follow an expedited path
through the switch fabric.
Sophisticated Traffic Management
• The switch supports up to 6 policers per Fast Ethernet port and up to 60 policers on a Gigabit Ethernet port.
• The switch offers granularity of traffic flows at 1 Mbps on Fast Ethernet ports and 8 Mbps on Gigabit Ethernet ports.
• The switch offers the ability to limit data flows based on MAC source/destination address, IP source/destination address,
TCP/UDP port numbers, or any combination of these fields.
• The switch offers the ability to manage data flows asynchronously upstream and downstream from the end station or on
the uplink.
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