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.
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]
[layer3]
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.
• One of the usage scenarios is to avoid ACL being applied on the L2 traffic which comes in via ICL. The layer 3
keyword can be used at the VLAN level.
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.
DellEMC(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
DellEMC(conf-if)#
To filter traffic on Telnet sessions, use only standard ACLs in the access-class command.
Counting ACL Hits
You can view the number of packets matching the ACL by using the count option when creating ACL entries.
1. Create an ACL that uses rules with the count option. Refer to Configure a Standard IP ACL Filter.
2. Apply the ACL as an inbound or outbound ACL on an interface.
3. show ip accounting access-list
EXEC Privilege mode
View the number of packets matching the ACL.
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Access Control Lists (ACLs)