Port ACLs
Port ACLs are ACLs that are applied to Layer 2 interfaces on a switch. Port ACLs are supported only on
physical interfaces and not on EtherChannel interfaces. Port ACLs can be applied on outbound and inbound
interfaces. The following access lists are supported:
•
Standard IP access lists using source addresses
•
Extended IP access lists using source and destination addresses and optional protocol type information
•
MAC extended access lists using source and destination MAC addresses and optional protocol type
information
The switch examines ACLs on an interface and permits or denies packet forwarding based on how the packet
matches the entries in the ACL. In this way, ACLs control access to a network or to part of a network.
This is an example of using port ACLs to control access to a network when all workstations are in the same
VLAN. ACLs applied at the Layer 2 input would allow Host A to access the Human Resources network, but
prevent Host B from accessing the same network. Port ACLs can only be applied to Layer 2 interfaces in the
inbound direction.
Figure 3: Using ACLs to Control Traffic in a Network
When you apply a port ACL to a trunk port, the ACL filters traffic on all VLANs present on the trunk port.
When you apply a port ACL to a port with voice VLAN, the ACL filters traffic on both data and voice VLANs.
With port ACLs, you can filter IP traffic by using IP access lists and non-IP traffic by using MAC addresses.
You can filter both IP and non-IP traffic on the same Layer 2 interface by applying both an IP access list and
a MAC access list to the interface.
Catalyst 2960-XR Switch Security Configuration Guide, Cisco IOS Release 15.0(2)EX1
OL-29434-01 109
Configuring IPv4 ACLs
Supported ACLs
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