Users Guide

CAM Usage

The following section describes CAM allocation and CAM optimization.

• User Configurable CAM Allocation

• CAM Optimization

User Configurable CAM Allocation

Allocate space for IPV6 ACLs by using the cam-acl command in CONFIGURATION mode.

The CAM space is allotted in filter processor (FP) blocks. The total space allocated must equal 13 FP blocks. (There are 16 FP

blocks, but System Flow requires three blocks that cannot be reallocated.)

Enter the ipv6acl allocation as a factor of 2 (2, 4, 6, 8, 10). All other profile allocations can use either even or odd numbered

ranges.

If you want to configure ACL's on VRF instances, you must allocate a CAM region using the vrfv4acl option in the cam-acl

command.

Save the new CAM settings to the startup-config (use write-mem or copy run start) then reload the system for the new

settings to take effect.

CAM Optimization

When you enable this command, if a policy map containing classification rules (ACL and/or dscp/ ip-precedence rules) is

applied to more than one physical interface on the same port-pipe, only a single copy of the policy is written (only one FP entry

is used). When you disable this command, the system behaves as described in this chapter.

Test CAM Usage

This command applies to both IPv4 and IPv6 CAM profiles, but is best used when verifying QoS optimization for IPv6 ACLs.

To determine whether sufficient ACL CAM space is available to enable a service-policy, use this command. To verify the actual

CAM space required, create a class map with all the required ACL rules, then execute the test cam-usage command in

Privilege mode. The following example shows the output when executing this command. The status column indicates whether

you can enable the policy.

Example of the test cam-usage Command

Dell#test cam-usage service-policy input asd stack-unit 1 port-set 0

--------------------------------------------------------------------------

1| 1| IPv4Flow| 232| 0|Allowed

Dell#

Implementing ACLs on Dell Networking OS

You can assign one IP ACL per interface. If you do not assign an IP ACL to an interface, it is not used by the software.

The number of entries allowed per ACL is hardware-dependent.

Access Control Lists (ACLs) 102