Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 119

When creating an access list, the sequence of the filters is important. You have a choice of assigning sequence numbers to the filters as you enter them, or the system assigns numbers in the order the filters are created. The sequence numbers are listed in the display output of the show config and show ip accounting access-list commands. Ingress and egress Hot Lock ACLs allow you to append or delete new rules into an existing ACL (already written into CAM) without disrupting traffic flow. Existing entries in the CAM are shuffled to accommodate the new entries. Hot lock ACLs are enabled by default and support both standard and extended ACLs and on all platforms. NOTE: Hot lock ACLs are supported for Ingress ACLs only. CAM Usage The following section describes CAM allocation and CAM optimization. • User Configurable CAM Allocation • CAM Optimization User-Configurable CAM Allocation User-configurable content-addressable memory (CAM) allows you to specify the amount of memory space that you want to allocate for ACLs. To allocate ACL CAM, use the cam-acl command in CONFIGURATION mode. For information about how to allocate CAM for ACL VLANs, see Allocating ACL VLAN CAM. The CAM space is allotted in filter processor (FP) blocks. The total amount of space allowed is 12 FP Blocks. System flow requires four blocks; these blocks cannot be reallocated. The ipv4acl profile range is from 0 to 8. When configuring space foripv6acl, the total number of Blocks must equal 12. The ipv6acl allocation must be a factor of 2 (2, 4). If allocation values are not entered for the CAM regions, the value is 0. 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. Test CAM Usage The test cam-usage command is supported on the C9000 series. 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 run the test cam-usage command in EXEC and EXEC Privilege mode. The following example shows the output when running this command. The status column indicates whether you can enable the policy. • test cam-usage service-policy input policy-map-input-name {{linecard line-card-number port-set port-set} | {linecard all [port-set port-set]} | { pe pe-id stackunit stack-unit-number port-set port-set}} Access Control Lists (ACLs) 119