Reference Guide

● When Dell EMC Networking OS switches the packets, the egress L3 ACL filters the packet.
For the following features, if you enable counters on rules that have already been configured and a new rule is either inserted or
prepended, all the existing counters are reset:
● L2 ingress access list
● L3 egress access list
● L2 egress access list
If a rule is simply appended, existing counters are not affected.
Table 7. L2 and L3 Filtering on Switched Packets
L2 ACL Behavior L3 ACL Behavior Decision on Targeted Traffic
Deny Deny L3 ACL denies.
Deny Permit L3 ACL permits.
Permit Deny L3 ACL denies.
Permit Permit L3 ACL permits.
NOTE: If you configure an interface as a vlan-stack access port, only the L2 ACL filters the packets. The L3 ACL applied to
such a port does not affect traffic. That is, existing rules for other features (such as trace-list, policy-based routing [PBR],
and QoS) are applied to the permitted traffic.
For information about MAC ACLs, refer to Layer 2.
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
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Access Control Lists (ACLs)