Reference Guide

Applying an IP ACL to an Interface
To pass traffic through a configured IP ACL, assign that ACL to a physical interface, a port channel interface, or a VLAN.
The IP ACL is applied to all traffic entering a physical or port channel interface and the traffic is either forwarded or dropped
depending on the criteria and actions specified in the ACL.
The same ACL may be applied to different interfaces and that changes its functionality. For example, you can take ACL “ABCD”
and apply it using the in keyword and it becomes an ingress access list. If you apply the same ACL using the out keyword, it
becomes an egress access list. If you apply the same ACL to the Loopback interface, it becomes a Loopback access list.
For more information about Layer 3 interfaces, refer to Interfaces.
1. Enter the interface number.
CONFIGURATION mode
interface interface {slot/port | port-channel-number}
2. Configure an IP address for the interface, placing it in Layer 3 mode.
INTERFACE mode
ip address ip-address
3. Apply an IP ACL to traffic entering or exiting an interface.
INTERFACE mode
ip access-group access-list-name {in} [implicit-permit] [vlan vlan-range]
NOTE: The number of entries allowed per ACL is hardware-dependent. For detailed specification about entries allowed
per ACL, refer to your line card documentation.
4. Apply rules to the new ACL.
INTERFACE mode
ip access-list [standard | extended] name
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.
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.
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.
Dell(conf)#interface gige 0/0
Dell(conf-if-gige0/0)#ip access-group abcd in
Dell(conf-if-gige0/0)#show config
!
gigethernet 0/0
90
Access Control Lists (ACLs)