Cisco Systems 2950, 2955 Quality of Service and Class of Service

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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
OL-10101-02
Chapter 1 Overview
Features
• IEEE 802.1x with wake-on-LAN to allow dormant PCs to be powered on based on the receipt of a
specific Ethernet frame
• IEEE 802.1x with restricted VLAN to provide limited services to users who are IEEE 802.1x
compliant, but do not have the credentials to authenticate via the standard IEEE 802.1x processes.
• Network Admission Control (NAC) Layer 2 IEEE 802.1x validation of the antivirus condition or
posture of endpoint systems or clients before granting the devices network access.
For information about configuring NAC Layer 2 IEEE 802.1x validation, see the “Configuring NAC
Layer 2 IEEE 802.1x Validation” section on page 9-27.
• Standard and extended IP access control lists (ACLs) for defining security policies (available only
with the EI)
Quality of Service and Class of Service
• Automatic quality of service (auto-QoS) to simplify the deployment of existing QoS features by
classifying traffic and configuring egress queues (only available in the EI)
• Classification
– IEEE 802.1p class of service (CoS) with four priority queues on the switch 10/100 and LRE
ports and eight priority queues on the Gigabit ports for prioritizing mission-critical and
time-sensitive traffic from data, voice, and telephony applications
– IP Differentiated Services Code Point (IP DSCP) and CoS marking priorities on a per-port basis
for protecting the performance of mission-critical applications (only available with the EI)
– Flow-based packet classification (classification based on information in the MAC, IP, and
TCP/UDP headers) for high-performance quality of service at the network edge, allowing for
differentiated service levels for different types of network traffic and for prioritizing
mission-critical traffic in the network (only available in the EI)
– Support for IEEE 802.1p CoS scheduling for classification and preferential treatment of
high-priority voice traffic
– Trusted boundary (detect the presence of a Cisco IP Phone, trust the CoS value received, and
ensure port security. If the IP phone is not detected, disable the trusted setting on the port and
prevent misuse of a high-priority queue.)
• Policing
– Traffic-policing policies on the switch port for allocating the amount of the port bandwidth to
a specific traffic flow
– Policing traffic flows to restrict specific applications or traffic flows to metered, predefined
rates
– Up to 60 policers on ingress Gigabit-capable Ethernet ports
Up to six policers on ingress 10/100 ports
Granularity of 1 Mbps on 10/100 ports and 8 Mbps on 10/100/1000 ports
– Out-of-profile markdown for packets that exceed bandwidth utilization limits
Note Policing is available only in the EI.
• Egress Policing and Scheduling of Egress Queues—Four egress queues on all switch ports. Support
for strict priority and weighted round-robin (WRR) CoS policies