Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 124

seq 10 deny icmp any any seq 15 permit 1.1.1.2 Configure Egress ACLs Egress ACLs are applied to line cards 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 denial of service (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. To create an egress ACL, use the ip access-group command in EXEC Privilege mode. The example shows viewing the configuration, applying rules to the newly created access group, and viewing the access list. NOTE: VRF based ACL configurations are not supported on the egress traffic. Example of Applying ACL Rules to Egress Traffic and Viewing ACL Configuration To specify ingress, use the out keyword. Begin applying rules to the ACL with the ip access-list extended abcd command. To view the access-list, use the show command. DellEMC(conf)#interface TenGigabitEthernet 1/1 DellEMC(conf-if-te-1/1)#ip access-group abcd out DellEMC(conf-if-te-1/1)#show config ! TenGigabitEthernet 1/1 no ip address ip access-group abcd out no shutdown DellEMC(conf-if-te-1/1)#end DellEMC#configure terminal DellEMC(conf)#ip access-list extended abcd DellEMC(config-ext-nacl)#permit tcp any any DellEMC(config-ext-nacl)#deny icmp any any DellEMC(config-ext-nacl)#permit 1.1.1.2 DellEMC(config-ext-nacl)#end DellEMC#show ip accounting access-list ! Extended Ingress IP access list abcd on tengigabitethernet 0/0 seq 5 permit tcp any any seq 10 deny icmp any any seq 15 permit 1.1.1.2 DellEMC#configure terminal DellEMC(conf)#interface te 1/2 DellEMC(conf-if-te-1/2)#ip vrf forwarding blue DellEMC(conf-if-te-1/2)#show config ! interface TenGigabitEthernet 1/2 ip vrf forwarding blue no ip address shutdown DellEMC(conf-if-te-1/2)# DellEMC(conf-if-te-1/2)# DellEMC(conf-if-te-1/2)#end DellEMC# 124 Access Control Lists (ACLs)