Configuring Qos Tcam Carving; About Qos Tcam Carving - Cisco Nexus 9000 Series Configuration Manual

Configuring QoS TCAM Carving

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About QoS TCAM Carving

You can change the size of the access control list (ACL) ternary content addressable memory (TCAM) regions
in the hardware.
On Cisco Nexus 9300 and 9500 platform switches and Cisco Nexus 3164Q, 31128PQ, 3232C, and 3264Q
switches, the egress TCAM size is 1K, divided into four 256 entries. On Cisco Nexus NFE2-enabled devices
(such as the Cisco Nexus 3232C and 3264Q switches), the ingress TCAM size is 6K, divided into twelve 512
slices. Three slices are in one group. On other Cisco Nexus 9300 and 9500 platform switches and Cisco
Nexus 3164Q and 31128PQ switches, the ingress TCAM size is 4K, divided into eight 256 slices and four
512 slices. A slice is the unit of allocation. A slice can be allocated to one region only. For example, a 512-size
slice cannot be used to configure two features of size 256 each. Similarly, a 256-size slice cannot be used to
configure two features of size 128 each. The IPv4 TCAM regions are single wide. The IPv6, QoS, MAC,
CoPP, and system TCAM regions are double wide and consume double the physical TCAM entries. For
example, a logical region size of 256 entries actually consumes 512 physical TCAM entries.
On Cisco Nexus 9200 Series switches, the egress TCAM size is 2K, and the ingress TCAM size is 4K. The
concepts of TCAM slices and single- and double-wide regions do not apply to these switches. For example,
the ing-ifacl region can host IPv4, IPv6, or MAC type entries. IPv4 and MAC types occupy one TCAM entry
whereas IPv6 types occupy two TCAM entries.
The number of default entries for QoS TCAM carving are:
• The default QoS TCAM carving for the Cisco Nexus 9504, Cisco Nexus 9508, and Cisco Nexus 9516
• The default QoS TCAM carving for ALE (Application Leaf Engine) enabled devices is for Layer 2 port
About QoS TCAM Carving, on page 39
Guidelines and Limitations, on page 43
Configuring QoS TCAM Carving, on page 44
is for Layer 3 QoS (IPV4) with 256 entries. For these switches, all of the QoS TCAM entries are double
wide.
QoS (IPV4) with 256 entries. For these switches, all of the QoS TCAM entries are double wide.
Cisco Nexus 9000 Series NX-OS Quality of Service Configuration Guide, Release 7.x
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