About QoS TCAM Carving
You can change the size of the access control list (ACL) ternary content addressable memory (TCAM) regions in the hardware. Both ingress and egress TCAM regions can be altered.
Ingress TCAM Region Features
Ingress TCAM regions are comprised of the following layout and sizes:
-
Total TCAM size: 3.5K, 80 bit wide
-
Total Counters: 3.5K
-
Configurable width: 80 bit, 160 bit, 320 bit
-
Configurable depth: 128, 256 or multiples of 256
-
Max lookup: 10
For ingress TCAM, there are three logical QoS regions:
-
ing-l2-qos
-
ing-l3-vlan-qos
-
ing-l2-l3-qos
For carving the above three regions, the following limitations apply:
-
If you carve
ing-l2-l3-qos
, thening-l2-qos
oring-l3-vlan-qos
cannot be carved. -
If you carve
ing-l2-qos
anding-l3-vlan-qos
, each of these two logical regions matches to a separate physical TCAM region.
Feature |
Width |
Lookup |
Default Carving |
---|---|---|---|
PACL MAC |
160 bit |
1 |
No |
PACL IPv4 |
160 bit |
1 |
No |
PACL IPv6 |
320 bit |
2 |
No |
RACL IPv4 |
160 bit |
1 |
Yes (size: 256) |
RACL IPv4 UDF |
320 bit |
2 |
No |
RACL IPv6 |
320 bit |
2 |
No |
VACL MAC |
160 bit |
1 |
No |
VACL IPv4 |
160 bit |
1 |
No |
VACL IPv6 |
320 bit |
2 |
No |
L2 QoS |
320 bit |
2 |
No |
L3-VLAN QoS |
320 bit |
2 |
Yes (size: 128) |
L2-L3 QoS |
320 |
2 |
No |
SPAN |
160 bit |
1 |
Yes (size: 128) |
SUP |
320 bit |
2 |
No |
VPC Convergence |
80 bit |
1 |
No |
Storm Control |
80 |
1 |
Yes (size: 256) |
Egress TCAM Region Features
Egress TCAM regions are comprised of the following layout and sizes:
-
Total TCAM size: 1.5K, 80 bit wide
-
Total Counters: 1.5K
-
Configurable width: 80 bit, 160 bit, 320 bit
-
Configurable depth: 128, 256 or multiples of 256
-
Max lookup: 4
Feature |
Width |
Lookup |
Default Carving |
---|---|---|---|
RACL IPv4 |
160 bit |
1 |
No |
RACL IPv6 |
320 bit |
2 |
No |
VACL MAC |
160 bit |
1 |
No |
VACL IPv4 |
160 bit |
1 |
No |
VACL IPv6 |
320 bit |
2 |
No |
L2 QoS |
160 bit |
2 |
No |
L3 VLAN QoS |
160 bit |
2 |
No |
PFC Counter |
80 bit |
1 |
Yes (size: 256) |
You must save the configuration and reload the system for the region configuration to become effective.