Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 112

www.dell.com | support.dell.com Configuring Layer 2 and Layer 3 ACLs on an Interface 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: • The packets routed by FTOS are governed by the L3 ACL only, since they are not filtered against an L2 ACL. • The packets switched by FTOS are first filtered by the L3 ACL, then by the L2 ACL. • When packets are switched by FTOS, the egress L3 ACL does not filter the packet. For the following features, if counters are enabled on rules that have already been configured and a new rule is either inserted or prepended, all the existing counters will be 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 7-2. L2 and L3 ACL Filtering on Switched Packets L2 ACL Behavior Deny Deny Permit Permit L3 ACL Behavior Deny Permit Deny Permit Decision on Targeted Traffic Denied by L3 ACL Permitted by L3 ACL Denied by L3 ACL Permitted by L3 ACL Note: If an interface is configured as a "vlan-stack access" port, the packets are filtered by an L2 ACL only. The L3 ACL applied to such a port does not affect traffic. That is, existing rules for other features (such as trace-list, PBR, and QoS) are applied accordingly to the permitted traffic. For information on MAC ACLs, refer to Chapter 20, "Layer 2," on page 387. Assign an IP ACL to an Interface c s Ingress IP ACLs are supported on platforms: and e Ingress and Egress IP ACL are supported on platform: and To pass traffic through a configured IP ACL, you must assign that ACL to a physical interface, a port channel interface, or a VLAN. The IP ACL is applied to all traffic entering a physical or port channel interface and the traffic is either forwarded or dropped depending on the criteria and actions specified in the ACL. 112 | Access Control Lists (ACL), Prefix Lists, and Route-maps