Configuring Traffic Classes; Configuring Acl Classification - Cisco Nexus 9000 Series Configuration Manual

Configuring Classification
• QoS classification is not supported on the FEX interfaces ingressing the VXLAN traffic. This limitation
• For matching the packets based on DSCP, CoS, or precedence in Cisco Nexus 9300-EX Series switches,
• You can specify a maximum of 1024 match criteria in a class map.
• You can configure a maximum of 128 classes for use in a single policy map.
• When you match on an ACL, the only other match you can specify is the Layer 3 packet length in a
• The match-all option in the class-map type qos match-all command is not supported. The match criteria
• You can classify traffic on Layer 2 ports based on either the port policy or VLAN policy of the incoming
• When a Cisco Nexus Fabric Extender (FEX) is connected and in use, data traffic should not be marked
• Control traffic (control frames) from the switch to the FEX are marked with a CoS value of 7 and are
• FEX host interfaces (HIF) are supported by the FEX QoS policy.
• A jumbo ping (MTU of 2400 or greater) from a switch supervisor to a FEX host fails because the control
• QoS classification policies are not supported under system qos for Layer 2 switch ports. However, you

Configuring Traffic Classes

Configuring ACL Classification

You can classify traffic by matching packets based on existing ACLs. The permit and deny ACL keywords
are ignored in the matching. QoS does not use the permit-deny functions of ACLs. You can classify by either
IPv4, IPv6, or MAC address.
is applicable to all Cisco Nexus 9000 Series switches.
the TCAM entries for both IPv4 (single-wide is 1 entry) and IPv6 (double-wide are 2 entries) are installed
in the hardware. For example, if you match DSCP 4, 3 entries are installed in the hardware, 1 entry for
IPv4 and 2 entries for IPv6.
match-all class.
of this command becomes the same as in the class-map type qos match-any command. The class-map
type qos match-all command yields the same results as the class-map type qos match-any command.
packet but not both. If both are present, the device acts on the port policy and ignores the VLAN policy.
with a CoS value of 7. CoS 7 is reserved for control traffic transiting the Fabric Extender.
limited to a jumbo MTU frame size of 2344 bytes.
◦ QoS TCAM carving is supported on ALE (Application Leaf Engine) enabled switches.
◦ Only system level policies are supported.
◦ Match on CoS is supported.
◦ Match on QoS-group is supported.
queue on a FEX supports an MTU limited to 2240.
can configure a QoS policy to classify the incoming traffic based on CoS/DSCP and map it to different
queues. The QoS policy needs to be applied under all the interfaces that require the classification.
Cisco Nexus 9000 Series NX-OS Quality of Service Configuration Guide, Release 7.x

Configuring Traffic Classes

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