Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 131
Con Layer 2 and Layer 3 ACLs, Using ACL VLAN Groups, L2 ACL Behavior
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Configure Layer 2 and Layer 3 ACLs Both Layer 2 and Layer 3 ACLs may be configured on an interface in Layer 2 mode. If both L2 and L3 ACLs are applied to an interface, the following rules apply: • When the system routes the packets, only the L3 ACL governs them because they are not filtered against an L2 ACL. • When the system switches the packets, first the L3 ACL filters them, then the L2 ACL filters them. • When the system switches the packets, the egress L3 ACL does not filter the packet. For the following features, if you enable counters on rules that have already been configured and a new rule is either inserted or prepended, all the existing counters are reset: • L2 ingress access list • L3 egress access list • L2 egress access list If a rule is simply appended, existing counters are not affected. Table 6. L2 and L3 Filtering on Switched Packets L2 ACL Behavior Deny Deny Permit Permit L3 ACL Behavior Deny Permit Deny Permit Decision on Targeted Traffic L3 ACL denies. L3 ACL permits. L3 ACL denies. L3 ACL permits. NOTE: If you configure an interface as a vlan-stack access port, only the L2 ACL filters the packets. The L3 ACL applied to such a port does not affect traffic. That is, existing rules for other features (such as trace-list, policy-based routing [PBR], and QoS) are applied to the permitted traffic. For information about MAC ACLs, refer to Layer 2. Using ACL VLAN Groups Use an ACL VLAN group to optimize ACL CAM usage by minimizing the number of CAM entries when you apply an egress IP ACL on the member interfaces of specified VLANs. When you apply an ACL on individual VLANs, the amount of CAM space required increases greatly because the ACL rules are saved for each VLAN ID. To avoid excessive use of the CAM space, you can configure ACL VLAN groups to combine all VLANs on which ACL filtering criteria is applied in a single class ID instead of multiple VLAN IDs. NOTE: CAM optimization applies only when you use an ACL VLAN group; it does not apply if you apply an ACL on individual VLANs. Access Control Lists (ACLs) 131
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