Install Guide

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#
Applying Egress Layer 3 ACLs (Control-Plane)
By default, packets originated from the system are not filtered by egress ACLs.
For example, if you initiate a ping session from the system and apply an egress ACL to block this type of traffic on the interface,
the ACL does not affect that ping traffic. The Control Plane Egress Layer 3 ACL feature enhances IP reachability debugging by
implementing control-plane ACLs for CPU-generated and CPU-forwarded traffic. Using permit rules with the count option, you
can track on a per-flow basis whether CPU-generated and CPU-forwarded packets were transmitted successfully.
NOTE:
The ip control-plane [egress filter] and the ipv6 control-plane [egress filter]
commands are not supported.
118 Access Control Lists (ACLs)