Dell Force10 Z9000 FTOS Configuration Guide for Z9000 System - Page 102

www.dell.com | support.dell.com Figure 6-8. Extended IP ACL FTOS(config-ext-nacl)#deny tcp host 123.55.34.0 any FTOS(config-ext-nacl)#permit udp 154.44.123.34 0.0.255.255 host 34.6.0.0 FTOS(config-ext-nacl)#show config ! ip access-list extended nimule seq 5 deny tcp host 123.55.34.0 any seq 10 permit udp 154.44.0.0 0.0.255.255 host 34.6.0.0 FTOS(config-ext-nacl)# To view all configured IP ACLs and the number of packets processed through the ACL, use the show ip accounting access-list command (Figure 232) in the EXEC Privilege mode. 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 6-2. 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. 102 | Access Control Lists (ACLs)