Reference 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.

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.

Re-Allocating CAM for Ingress ACLs and QoS

The default CAM allocation settings for ingress ACL and QoS regions are shown in the following list.

• L2 ACL(l2acl): 4

• L3 ACL (ipv4acl): 4

• IPv6 L3 ACL (ipv6acl): 0

• L3 QoS (ipv4qos): 2

• L2 QoS (l2qos): 1

• L2PT (l2pt): 0

• MAC ACLs (ipmacacl): 0

• ECFMACL (ecfmacl): 0

• VMAN QoS (vman-qos): 0

• VMAN Dual QoS (vman-dual-qos): 0

• FCoE ACL (fcoeacl): 2

• iSCSI Opt ACL (iscsioptacl): 0

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Content Addressable Memory (CAM)