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10.   

ACLs 

Access Control Lists

This chapter describes the Access Control Lists (ACLs) feature. The following examples are 
provided:

•     MAC ACLs 

•     Set Up an IP ACL with Two Rules 

•     One-Way Access Using a TCP Flag in an ACL 

•     Use ACLs to Configure Isolated VLANs on a Layer 3 Switch 

•     Set up a MAC ACL with Two Rules 

•     ACL Mirroring 

•     ACL Redirect 

•     Configure IPv6 ACLs 

Access control lists (ACLs) can control the traffic entering a network. Normally ACLs reside in a 

firewall router or in a router connecting two internal networks. When you configure ACLs, you 
can selectively admit or reject inbound traffic, thereby controlling access to your network or to 
specific resources on your network. 

You can set up ACLs to control traffic at Layer 2-, or Layer 3. MAC ACLs are used for Layer 2. IP 

ACLs are used for Layer 3. Each ACL contains a set of rules that apply to inbound traffic. Each 

rule specifies whether the contents of a given field should be used to permit or deny access to 
the network, and may apply to one or more of the fields within a packet.

The following limitations apply to ACLs. These limitations are platform dependent.

The maximum of number of ACLs is 100.

The maximum number of rules per ACL is 8–10.

Stacking systems do not support redirection.

The system does not support MAC ACLs and IP ACLs on the same interface. 

The system supports ACLs set up for inbound traffic only.