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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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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#

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