Concept Guide

L2 ACL Behavior L3 ACL Behavior Decision on Targeted Trac
Permit Permit L3 ACL permits.
NOTE: If you congure an interface as a vlan-stack access port, only the L2 ACL lters the packets. The L3 ACL applied to such
a port does not aect trac. That is, existing rules for other features (such as trace-list, policy-based routing [PBR], and QoS)
are applied to the permitted trac.
For information about MAC ACLs, refer to Layer 2.
Assign an IP ACL to an Interface
To pass trac through a congured IP ACL, assign that ACL to a physical interface, a port channel interface, or a VLAN.
The IP ACL is applied to all trac entering a physical or port channel interface and the trac is either forwarded or dropped depending on
the criteria and actions specied in the ACL.
The same ACL may be applied to dierent 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.
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 Congure an IP address for the interface, placing it in Layer-3 mode.
INTERFACE mode
ip address ip-address
3 Apply an IP ACL to trac entering or exiting an interface.
INTERFACE mode
ip access-group access-list-name {in | out} [implicit-permit] [vlan vlan-range] [layer3]
NOTE
: The number of entries allowed per ACL is hardware-dependent. For detailed specication 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 GigabitEthernet 0/0
ip address 10.2.1.100 255.255.255.0
ip access-group nimule in
no shutdown
Dell(conf-if)#
120
Access Control Lists (ACLs)