Administrator Guide

Assign 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.
This section describes the following:
• Configure Ingress ACLs
• Configure Egress ACLs
For more information about Layer-3 interfaces, refer to Interfaces.
Applying an IP ACL
To apply an IP ACL (standard or extended) to a physical or port channel interface, use the following commands.
1 Enter the interface number.
CONFIGURATION mode
interface interface slot/port
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 | vrf vrf-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.
Example of Viewing ACLs Applied to an Interface
Dell(conf-if)#show conf
!
interface TenGigabitEthernet 1/1
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.
126
Access Control Lists (ACLs)