Dell S4820T, Configuration Manual

Page: 132 / 1178

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
Stack-unit|Portpipe|CAM Partition|Available CAM|Estimated CAM per Port|Status
--------------------------------------------------------------------------
1| 1| IPv4Flow| 232| 0|Allowed
Dell#
132
Access Control Lists (ACLs)