Users Guide

Content Addressable Memory (CAM)

Content addressable memory (CAM) is supported on Dell Networking OS.

CAM is a type of memory that stores information in the form of a lookup table. On the S5000 systems, CAM

stores Layer 2 and Layer 3 forwarding information, access-lists (ACLs), flows, and routing policies.

Topics:

• CAM Allocation

• Re-Allocating CAM for Ingress ACLs and QoS

• Re-Allocating CAM for Egress ACLs

• Testing CAM Usage for QoS Policies

• Displaying CAM-ACL Settings

• Displaying CAM-ACL-Egress Settings

• CAM Optimization

CAM Allocation

User-configurable CAM allocation is supported on the S5000 switch in separate partitions for ingress and

egress ACLs and QoS policies.

You can re-allocate memory space:

• For ingress ACLs and QoS policies by using the cam-acl command in CONFIGURATION mode.

• For egress ACLs by using the cam-acl-egress command in CONFIGURATION mode.

CAM space is allotted in FP blocks. The total allocated space for:

• Ingress CAM regions must equal 13 FP blocks.

• Egress CAM regions must equal four FP blocks.

NOTE: CAM consists of 16 FP blocks, but System Flow CAM requires three blocks that cannot be re-

allocated.

The following table lists the default CAM allocation settings.

Table 14. Default Cam Allocation Settings

CAM Allocation Setting

L2Acl 6

Content Addressable Memory (CAM) 286