Cisco Catalyst 2950 User Manual

29-20
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
78-11380-12
Chapter 29 Configuring QoS
Configuring Standard QoS
Configuring Classification Using Port Trust States
This section describes how to classify incoming traffic by using port trust states:
• Configuring the Trust State on Ports within the QoS Domain, page 29-20
• Configuring the CoS Value for an Interface, page 29-22
• Configuring Trusted Boundary, page 29-23
• Enabling Pass-Through Mode, page 29-25
Note Both the SI and EI support this feature.
Configuring the Trust State on Ports within the QoS Domain
Packets entering a QoS domain are classified at the edge of the QoS domain. When the packets are
classified at the edge, the switch port within the QoS domain can be configured to one of the trusted
states because there is no need to classify the packets at every switch within the QoS domain. Figure 29-4
shows a sample network topology.
Table 29-5 Interaction Between Policy Maps and Security ACLs
Policy-Map Conditions
Security-ACL
Conditions Action
When the packet is in profile. Permit specified
packets.
Traffic is forwarded.
When the packet is out of profile and the
out-of-profile action is to mark down the DSCP
value.
Drop specified
packets.
Traffic is dropped.
When the packet is out of profile and the
out-of-profile action is to drop the packet.
Permit specified
packets.
Traffic is dropped.
Drop specified
packets.
Traffic is dropped.

Cisco Catalyst 2950 Specifications

General

Forwarding Bandwidth	8.8 Gbps
Switching Capacity	13.6 Gbps
Forwarding Rate	6.6 Mpps
Weight	3.6 kg
RAM	16 MB
Flash Memory	8 MB
Operating Humidity	10% to 85% non-condensing
Uplink Ports	2 x 10/100/1000Base-T
Dimensions	4.4 cm x 44.5 cm x 24.2 cm
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Quality of Service (QoS), VLAN support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1p
Status Indicators	system
Operating Temperature	0 to 45°C
Ports	24 x 10/100 Ethernet ports
MAC Address Table Size	8, 192 entries
Power Supply	Internal 100-240V AC, 50-60Hz