Reference Guide
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 9 FP
blocks. (There are 12 FP blocks, but System Flow requires three blocks that cannot be reallocated.)
Enter the ipv6acl allocation as a factor of 3 (3, 6, 9). 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
Stack-unit|Portpipe|CAM Partition|Available CAM|Estimated CAM per Port|Status
--------------------------------------------------------------------------
1| 1| IPv4Flow| 232| 0|Allowed
Dell#
Allocating ACL VLAN CAM
CAM optimization for ACL VLAN groups is not enabled by default. You must allocate blocks of ACL VLAN
CAM to enable ACL CAM optimization by using the cam-acl-vlan command.
By default, 0 blocks of CAM are allocated for VLAN services in the VLAN Content Aware Processor
(VCAP), an application that modifies VLAN settings before forwarding packets on member interfaces. The
cam-acl-vlan {vlanaclopt | vlanopenflow} command allows you to allocate filter processor
(FP) blocks of memory for ACL VLAN services: Open Flow and ACL VLAN optimization.
You can configure CAM allocation for only two of these VLAN services at a time. You can allocate from 0
to 2 FP blocks for each VLAN service.
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Access Control Lists (ACLs)