Cisco Nexus 9000 Series Configuration Manual page 65

Configuring QoS TCAM Carving
• Egress QoS policies on ALE uplink ports on top-of-rack (TOR) platforms are not supported.
• The egress QoS policy supports marking, policing, and classification.
• Egress qos policies do not support packet-length based matching.
• The set qos-group command is not supported for egress QoS policies.
However, the set qos-group command is supported for egress QoS policies when applied on a 100G
interface.
• Depending on the policy-map match criteria, the relevant egress QoS TCAM regions, such as e-qos,
e-mac-qos, e-ipv6-qos, egr-l2-qos, and egr-l3-vlan-qos, must be carved for end-to-end QoS within the
device.
• Set the egress QoS TCAM region size to 0 before downgrading to earlier images. Remove all egress
QoS policies before downgrading to earlier images.
Procedure
Command or Action
Step 1 hardware access-list tcam region e-racl tcam-size
Step 2 hardware access-list tcam region [e-qos | e-qos-lite |
e-ipv6-qos | e-mac-qos | egr-l2-qos | egr-l3-vlan-qos ]
tcam-size
Example:
switch(config)# hardware access-list tcam region
egr-l2-vlan-qos 256
Warning: Please reload all linecards for the
configuration to take effect
switch(config)#
Example:
switch(config)# hardware access-list tcam region
egr-l3-vlan-qos 256
Warning: Please reload all linecards for the
configuration to take effect
switch(config)#
Note Egress classification for egress packet scheduling is supported only on 100G
platforms.
Cisco Nexus 9000 Series NX-OS Quality of Service Configuration Guide, Release 7.x
Purpose
To enable carving your QoS (IPv4) TCAM region, specify
the e-racl region to free up resources. Also specify the
reduced TCAM size for the e-racl region.
The hardware access-list tcam region [ e-qos | e-qos-lite
| e-ip6-qos | e-mac-qos | egr-l2-qos | egr-l3-vlan-qos]
tcam-size command specifies the egress QoS (IPv4) TCAM
region and the TCAM size. The egr-l2-qos | egr-l3-vlan-qos
options specify the egress QoS TCAM regions and TCAM
size. An egress QoS TCAM of 256 size, takes 512 entries
because QoS TCAM is double-wide.
Note All egress QoS (IPv4) TCAM regions are double
wide, except for the e-qos-lite region which is
single wide.
Enabling Egress QoS (IPv4)
51