SMC Networks SMC6824M manual Configuring Access Control Lists

CONFIGURING THE SWITCH

Access Control Lists

Access Control Lists (ACL) provide packet filtering for IP frames (based on address, protocol, Layer 4 protocol port number or TCP control code) or any frames (based on MAC address or Ethernet type). To filter incoming packets, first create an access list, add the required rules, specify a mask to modify the precedence in which the rules are checked, and then bind the list to a specific port.

Configuring Access Control Lists

An ACL is a sequential list of permit or deny conditions that apply to IP addresses, MAC addresses, or other more specific criteria. This switch tests ingress or egress packets against the conditions in an ACL one by one. A packet will be accepted as soon as it matches a permit rule, or dropped as soon as it matches a deny rule. If no rules match for a list of all permit rules, the packet is dropped; and if no rules match for a list of all deny rules, the packet is accepted.

You must configure a mask for an ACL rule before you can bind it to a port or set the queue or frame priorities associated with the rule. This is done by specifying masks that control the order in which ACL rules are checked. The switch includes two system default masks that pass/filter packets matching the permit/deny rules specified in an ingress ACL. You can also configure up to seven user-defined masks for an ingress or egress ACL.

Command Usage

The following restrictions apply to ACLs:

•Each ACL can have up to 32 rules.

•The maximum number of ACLs is also 32.

•However, due to resource restrictions, the average number of rules bound to the ports should not exceed 20.

•You must configure a mask for an ACL rule before you can bind it to a port or set the queue or frame priorities associated with the rule.

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