Service Manual

Configure Ingress ACLs
Ingress ACLs are applied to 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.
DellEMC(conf)#interface tengigabitethernet 1/1/1
DellEMC(conf-if-te1/1/1)#ip access-group abcd in
DellEMC(conf-if-te1/1/1)#show config
!
tengogabitethernet 1/1/1
no ip address
ip access-group abcd in
no shutdown
DellEMC(conf-if-te1/1/1)#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 1/1/1
seq 5 permit tcp any any
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 1/1/1
DellEMC(conf-if-te-1/1/1)#ip access-group abcd out
DellEMC(conf-if-te-1/1/1)#show config
!
TenGigabitEthernet 1/1/1
no ip address
ip access-group abcd out
no shutdown
DellEMC(conf-if-te-1/1/1)#end
DellEMC#configure terminal
DellEMC(conf)#ip access-list extended abcd
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Access Control Lists (ACLs)