Cisco Catalyst 2950 User Manual

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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 29 Configuring QoS
Configuring Standard QoS
Beginning in privileged EXEC mode, follow these steps to configure trusted boundary on a switch port:
When you enter the no mls qos trust interface configuration command, trusted boundary is not disabled.
If this command is entered and the port is connected to a Cisco IP Phone, the port does not trust the
classification of traffic that it receives. To disable trusted boundary, use the no mls qos trust device
interface configuration command
If you enter the mls qos cos override interface configuration command, the port does not trust the
classification of the traffic that it receives, even when it is connected to a Cisco IP Phone.
You cannot enable trusted boundary if auto-QoS is already enabled and vice-versa. If auto-QoS is
enabled and a Cisco IP Phone is absent on a port, the port does not trust the classification of traffic that
it receives.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
cdp enable Enable CDP globally. By default, it is enabled.
Step 3
interface interface-id Specify the interface to be trusted, and enter interface configuration
mode.
Valid interfaces include physical interfaces.
Step 4
cdp enable Enable CDP on the interface. By default, CDP is enabled.
Step 5
mls qos trust device cisco-phone Configure the Cisco IP Phone as a trusted device on the interface.
You cannot enable both trusted boundary and auto-QoS (auto qos
voip interface configuration command) at the same time; they are
mutually exclusive.
Step 6
mls qos trust cos Configure the port trust state to trust the CoS value of the ingress
packet.
By default, the port is not trusted.
Note In software releases earlier than Cisco IOS
Release 12.1(11)EA1, the mls qos trust cos command is
available only when the switch is running the EI.
For more information on this command, see the command reference
for this release.
Step 7
end Return to privileged EXEC mode.
Step 8
show mls qos interface [interface-id]
[policers]
Verify your entries.
Step 9
copy running-config startup-config (Optional) Save your entries in the configuration file.

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