Cisco Systems EA6500 Manual De Usuario

Configuring a Layer  2 LAN port for VLAN-based PFC QoS preserves the policy map port configuration. 
The no mls qos vlan-based port command reenables any previously configured port commands.

By default, all ingress ports are untrusted. You can configure the ingress port trust state on all Ethernet 
LAN ports except non-Gigabit Ethernet 1q4t/2q2t ports (see the 

). You can configure the ingress port trust state on OSM ports (see the 

). 

To configure the trust state of an ingress port, perform this task: 

When configuring the trust state of an ingress port, note the following:

With no other keywords, the mls qos trust command is equivalent to mls qos trust dscp.

The mls qos trust cos command enables receive-queue drop thresholds. To avoid dropping traffic 
because of inconsistent CoS values, configure ports with the mls qos trust cos command only when 
the received traffic is ISL or 802.1Q frames carrying CoS values that you know to be consistent with 
network policy.

Use the no mls qos trust command to set the port state to untrusted.

This example shows how to configure Gigabit Ethernet port 1/1 with the trust cos keywords:

Router# configure terminal 

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)# interface gigabitethernet 1/1 

Router(config-if)# mls qos trust cos 

Router(config-if)# end 

Router# 

This example shows how to verify the configuration:

Router# show queueing interface gigabitethernet 1/1 | include trust 

  Trust state: trust COS

Router# 

Router(config)# interface {{type

1

 slot/port} | 

{port-channel number}}

1.

type = ethernet, fastethernet, gigabitethernet, tengigabitethernet, ge-wan, pos, or atm. 

Selects the interface to configure.

Router(config-if)# mls qos trust [dscp | 

 | cos

2

] 

2.

Not supported for pos or atm interface types.

Configures the trust state of the port. 

Router(config-if)# no mls qos trust 

Reverts to the default trust state (untrusted). 

Router(config-if)# end 

Exits configuration mode.

Router# show mls qos 

Verifies the configuration.