Concept Guide

Content Addressable Memory (CAM)
Content addressable memory (CAM) is a type of memory that stores information in the form of a lookup table.
On Dell Networking systems, CAM stores Layer 2 and Layer 3 forwarding information, access-lists (ACLs), ows, and routing policies.
Topics:
• CAM Allocation
• Test CAM Usage
• View CAM-ACL Settings
• Conguring CAM Threshold and Silence Period
• CAM Optimization
CAM Allocation
Allocate space for IPV4 ACLs and quality of service (QoS) regions by using the cam-acl command in CONFIGURATION mode.
The CAM space is allotted in lter processor (FP) blocks. The total space allocated must equal 13 FP blocks.
NOTE
: There are 16 FP blocks, but the system ow requires three blocks that cannot be reallocated.
The following table lists the default CAM allocation settings.
Table 10. Default Cam Allocation Settings
CAM Allocation Setting
L3 ACL (ipv4acl) 2
L2 ACL(l2acl) 2
IPv6 L3 ACL (ipv6acl) 0
L3 QoS (ipv4qos) 2
L2 QoS (l2qos) 0
L2PT (l2pt) 0
MAC ACLs (ipmacacl) 0
ECFMACL (ecfmacl) 0
nlbclusteracl 2
FCOEACL (fcoeacl) 4
ISCSIOPTACL (iscsioptacl) 2
VMAN QoS (vman-qos) 0
VMAN Dual QoS (vman-dual-qos) 0
The ipv6acl and vman-dual-qos allocations must be entered as a factor of 2 (2, 4, 6, 8, 10). All other prole allocations can use either
even or odd numbered ranges.
NOTE
: There can be only one odd number of Blocks in the CLI conguration; the other Blocks must be in factors of 2. For
example, a CLI conguration of 5+4+2+1+1 Blocks is not supported; a conguration of 6+4+2+1 Blocks is supported.
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