Cisco NM-8B-U User Guide - Page 89
Configuring the CoS Value for an Interface, mls qos trust
UPC - 074632001001
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16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Configuration Tasks Command Step 3 mls qos trust {cos | dscp} Step 4 Step 5 Step 6 end show mls qos interface [interface-id] [policers] copy running-config startup-config Purpose Configures the port trust state. By default, the port is not trusted. Use the cos keyword setting if your network is composed of Ethernet LANs, Catalyst 2950 switches, and has no more than two types of traffic. Use the dscp keyword if your network is not composed of only Ethernet LANs and if you are familiar with sophisticated QoS features and implementations. Enter the cos keyword if you want ingress packets to be classified with the packet CoS values. For tagged IP packets, the DSCP value of the packet is modified based on the CoS-to-DSCP map. The egress queue assigned to the packet is based on the packet CoS value. Enter the dscp keyword if you want ingress packets to be classified with packet DSCP values. For non-IP packets, the packet CoS value is used for tagged packets; the default port CoS is used for untagged packets. Internally, the switch modifies the CoS value by using the DSCP-to-CoS map. Enter the dscp keyword if you are using an SVI that is a VLAN interface that you created by using the interface vlan vlan-id global configuration command. The DCSP-to-CoS map will be applied to packets arriving from a router to the Ethernet switch network module through an SVI. Returns to privileged EXEC mode. Verifies your entries. (Optional) Saves your entries in the configuration file. To return a port to its untrusted state, use the no mls qos trust interface configuration command. For information on how to change the default CoS value, see the "Configuring the CoS Value for an Interface" section on page 89. For information on how to configure the CoS-to-DSCP map, see the "Configuring the CoS-to-DSCP Map" section on page 96. Configuring the CoS Value for an Interface QoS assigns the CoS value specified with the mls qos cos interface configuration command to untagged frames received on trusted and untrusted ports. Beginning in privileged EXEC mode, follow these steps to define the default CoS value of a port or to assign the default CoS to all incoming packets on the port: Step 1 Step 2 Command configure terminal interface interface-id Purpose Enters global configuration mode. Enters interface configuration mode, and specify the interface to be trusted. Valid interfaces include physical interfaces. Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ 89