Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.100.0 - Page 103
Implementing ACLs on Dell Networking OS, CAM Allocation, CAM Optimization, Test CAM Usage
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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# 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. If counters are enabled on ACL rules that are already configured, those counters are reset when a new rule which is inserted or prepended or appended requires a hardware shift in the flow table. Resetting the counters to 0 is transient as the proginal counter values are retained after a few seconds. If there is no need to shift the flow in the hardware, the counters are not affected. This is applicable to the following features: • L2 Ingress Access list • L2 Egress Access list NOTE: IP ACLs are supported over VLANs in Dell Networking OS version 6.2.1.1 and higher. Access Control Lists (ACLs) 103
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