Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 122

To view which IP ACL is applied to an interface, use the show config command in INTERFACE mode, or use the show running-config command in EXEC mode. Example of Viewing ACLs Applied to an Interface Dell(conf-if)#show conf ! interface TengigabitEthernet 0/0 ip address 10.2.1.100 255.255.255.0 ip access-group nimule in no shutdown Dell(conf-if)# To filter traffic on Telnet sessions, use only standard ACLs in the access-class command. Applying Ingress ACLs on the Port Extender Ingress ACLs are applied to port extender interfaces and to traffic entering the system. These system-wide ACLs eliminate the need to apply ACLs onto each interface and achieves the same results. By localizing target traffic, it is a simpler implementation. To create an ingress ACL, use the ip access-group command in EXEC Privilege mode. The example shows applying the ACL, rules to the newly created access group, and viewing the access list. Example of Applying ACL Rules to Ingress Traffic and Viewing ACL Configuration To specify ingress, use the in keyword. Begin applying rules to the ACL with the ip access-list extended abcd command. To view the access-list, use the show command. Dell(conf)#interface pegigE 1/0/0 Dell(conf-if-pegi-1/0/0)#ip access-group abcd in Dell(conf-if-pegi-1/0/0)#show config ! pegig 1/0/0 no ip address ip access-group abcd in no shutdown Dell(conf-if-pegi-1/0/0)#end Dell#configure terminal Dell(conf)#ip access-list extended abcd Dell(config-ext-nacl)#permit tcp any any Dell(config-ext-nacl)#deny icmp any any Dell(config-ext-nacl)#permit 1.1.1.2 Dell(config-ext-nacl)#end Dell#show ip accounting access-list ! Extended Ingress IP access list abcd on pegigE 1/0/0 seq 5 permit tcp any any seq 10 deny icmp any any seq 15 permit 1.1.1.2 Applying Egress ACLs Egress ACLs are supported on interfaces and affect the traffic leaving the system. Configuring egress ACLs onto physical interfaces protects the system infrastructure from attack - malicious and incidental - by explicitly allowing only authorized traffic. These system-wide ACLs eliminate the need to apply ACLs onto each interface and achieves the same results. By localizing target traffic, it is a simpler implementation. To restrict egress traffic, use an egress ACL. For example, when a direct operating system (DOS) attack traffic is isolated to a specific interface, you can apply an egress ACL to block the flow from the exiting the box, thus protecting downstream devices. Access Control Lists (ACLs) 122