Configuring The Cos Value For An Interface - Cisco 4500M Software Manual

Chapter 29 Configuring QoS
When configuring the trust state of an interface, note the following:
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This example shows how to configure Gigabit Ethernet interface 1/1 with the trust cos keywords:
Switch# configure terminal
Enter configuration commands, one per line.
Switch(config)# interface gigabitethernet 1/1
Switch(config-if)# qos trust cos
Switch(config-if)# end
Switch#
This example shows how to verify the configuration:
Switch# show qos interface gigabitethernet 1/1 | include trust
Trust state: trust COS
Switch#

Configuring the CoS Value for an Interface

QoS assigns the CoS value specified with this command to untagged frames from ingress interfaces
configured as trusted and to all frames from ingress interfaces configured as untrusted.
To configure the CoS value for an ingress interface, perform this task:
Command
Step 1
Switch(config)# interface {fastethernet |
gigabitethernet | tengigabitethernet}
slot/interface
Step 2
Switch(config-if)# [no] qos cos default_cos
Step 3
Switch(config-if)# end
Step 4
Switch# show qos interface {fastethernet |
gigabitethernet | tengigabitethernet}
slot/interface
This example shows how to configure the CoS 5 as the default on Fast Ethernet interface 5/24:
Switch# configure terminal
Enter configuration commands, one per line.
Switch(config)# interface fastethernet 5/24
Switch(config-if)# qos cos 5
Switch(config-if)# end
Switch#
OL-6696-01
You can use the no qos trust command to set the interface state to untrusted.
For traffic received on an ingress interface configured to trust CoS using the qos trust cos command,
the transmit CoS is always the incoming packet CoS (or the ingress interface default CoS if the
packet is received untagged).
When the interface trust state is not configured to trust dscp using the qos trust dscp command, the
security and QoS ACL classification will always use the interface DSCP and not the incoming
packet DSCP.
|
Port-channel number }
End with CNTL/Z.
Purpose
Selects the interface to configure.
Configures the ingress interface CoS value.
Use the no keyword to clear a configured value and
return to the default.
Exits configuration mode.
Verifies the configuration.
End with CNTL/Z.
Software Configuration Guide—Release 12.2(25)EW
Configuring QoS
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