Concept Guide

Content Addressable Memory (CAM)

CAM is a type of memory that stores information in the form of a lookup table. On Dell EMC Networking systems, CAM stores Layer 2 (L2)

and Layer 3 (L3) forwarding information, access-lists (ACLs), ows, and routing policies.

CAM Allocation

CAM Allocation for Ingress

To allocate the space for regions such has L2 ingress ACL, IPV4 ingress ACL, IPV6 ingress ACL, IPV4 QoS, L2 QoS, PBR, VRF ACL, and so

forth, use the cam-acl command in CONFIGURATION mode.

The CAM space is allotted in eld processor (FP) blocks. The total space allocated must equal 9 FP blocks.

The following table lists the default CAM allocation settings.

NOTE: There are 12 FP blocks, but the system ow requires three blocks that cannot be reallocated.

The following table displays the default CAM allocation settings. To display the default CAM allocation, enter the show cam-acl command.

Table 11. Default Cam Allocation Settings

CAM Allocation Setting

L2Acl 2

Ipv4Acl 2

Ipv6Acl 0

Ipv4QoS 2

L2QoS 2

L2PT 0

IpMacAcl 1

VmanQos 0

EtsAcl 0

FcoeAcl 0

ipv4pbr 0

vrfv4Acl 0

Openow 0

fedgovacl 0

nlbclusteracl 0

NOTE: When you recongure CAM allocation, use the nlbclusteracl

number

command to change the number of NLB ARP

entries. The range is from 0 to 2. The default value is 0. At the default value of 0, eight NLB ARP entries are available for use.

This platform supports upto 512 CAM entries. Select 1 to congure 256 entries. Select 2 to congure 1024 entries. Even though

you can perform CAM carving to allocate the maximum number of NLB entries, Dell EMC Networking recommends you to use a

maximum of 64 NLB ARP entries.

256 Content Addressable Memory (CAM)