Configuring Marking; Configuring Dscp Marking - Cisco Nexus 9000 Series Configuration Manual

Configuring Marking

• Interface level egress QoS policies must be applied on 100G ports for egress packet scheduling. When
• Control traffic, such as BPDUs, routing protocol packets, LACP/CDP/BFD, GOLD packets, glean traffic,
• Span traffic automatically gets classified into qos-group 9 and is scheduled at absolute low priority.
• Egress QoS policies are not supported on Cisco Nexus 9200 platform switches (For 7.0(3)I3(1)).
• QOS marking policies can be enabled on subinterfaces
Configuring Marking
You can combine one or more of the marking features in a policy map to control the setting of QoS values.
You can then apply policies to either incoming or outgoing packets on an interface.
Note Do not press Enter after you use the set command and before you add the rest of the command. If you press
Enter directly after entering the set keyword, you will be unable to continue to configure with the QoS
configuration.

Configuring DSCP Marking

You can set the DSCP value in the six most significant bits of the DiffServ field of the IP header to a specified
value. You can enter numeric values from 0 to 63, in addition to the standard DSCP values shown in the
following table.
Table 31: Standard DSCP Values
Value
af11
af12
af13
af21
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egress QoS policies are not specifically configured for a 100G port, all egress packet traffic goes through
the default queue (Qos-group 0).
Note Egress QoS policy for 100G ports is applicable only for Cisco Nexus 9300
platform switches with the N9K-M4PC-CFP2 GEM or for Cisco Nexus 9500
platform switches with the Cisco Nexus 9408PC-CFP2 line cards. In all other
100G Cisco Nexus series switches, egress QoS policy is not a must.
and management traffic, are automatically classified into a control group based on a criteria. These
packets are classified into qos-group 8 and have a strict absolute priority over other traffic. These packets
are also given a dedicated buffer pool so that any congestion of data traffic does not affect control traffic.
The control qos-group traffic classification cannot be modified.
List of DSCP Values
AF11 dscp (001010)—decimal value 10
AF12 dscp (001100)—decimal value 12
AF13 dscp (001110)—decimal value 14
AF21 dscp (010010)—decimal value 18
Configuring Marking