Ip Access Control Lists (Acls); Cam Usage - Dell C9000 Series Networking Configuration Manual

IP Access Control Lists (ACLs)

You can create two different types of IP ACLs: standard or extended.
A standard ACL filters packets based on the source IP packet. An extended ACL filters traffic based on the
following criteria:
• IP protocol number
• Source IP address
• Destination IP address
• Source TCP port number
• Destination TCP port number
• Source UDP port number
• Destination UDP port number
For more information about ACL options, refer to the Dell Networking OS Command Reference Guide.
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 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.
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