Configuration Guidelines; Enabling Qos Globally; Configuring A Trusted Boundary To Ensure Port Security - Cisco 4500M Software Manual

Configuring QoS

Configuration Guidelines

Before beginning the QoS configuration, you should be aware of this information:
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QoS processes both unicast and multicast traffic.
Note

Enabling QoS Globally

To enable QoS globally, perform this task:
Command
Step 1
Switch(config)# qos
Step 2
Switch(config)# end
Step 3
Switch# show qos
This example shows how to enable QoS globally:
Switch(config)# qos
Switch(config)# end
Switch#
This example shows how to verify the configuration:
Switch# show qos
QoS is enabled globally
Switch#

Configuring a Trusted Boundary to Ensure Port Security

In a typical network, you connect a Cisco IP phone to a switch port as discussed in
"Configuring Voice Interfaces."
tag that uses the 802.1Q header. The header contains the VLAN information and the class of service
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If you have EtherChannel ports configured on your switch, you must configure QoS classification
and policing on the EtherChannel. The transmit queue configuration must be configured on the
individual physical ports that comprise the EtherChannel.
It is not possible to match IP fragments against configured IP extended ACLs to enforce QoS. IP
fragments are transmitted as best effort. IP fragments are denoted by fields in the IP header.
It is not possible to match IP options against configured IP extended ACLs to enforce QoS. These
packets are sent to the CPU and processed by software. IP options are denoted by fields in the IP
header.
Control traffic (such as spanning-tree BPDUs and routing update packets) received by the switch are
subject to all ingress QoS processing.
If you want to use the set command in the policy map, you must enable IP routing (disabled by
default) and configure an IP default route to send traffic to the next-hop device that is capable of
forwarding.
Purpose
Enables QoS on the switch.
Use the no qos command to globally disable QoS.
Exits configuration mode.
Verifies the configuration.
Traffic sent from the telephone to the switch is typically marked with a
Chapter 29 Configuring QoS
Chapter 30,
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