For extended ACL, TCP, and UDP filters, you can match criteria on specific or ranges of TCP or UDP ports. For
extended ACL TCP filters, you can also match criteria on established TCP sessions.
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 Dell Networking Operating System (OS) 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
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.
Access Control Lists (ACLs) 139
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