Cisco Catalyst 2960 Series, Configuration Manual

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prevent Host B from accessing the same network. Port ACLs can only be applied to Layer 2 interfaces in the
inbound direction.
Figure 76: 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.
You cannot apply more than one IP access list and one MAC access list to a Layer 2 interface. If an IP
access list or MAC access list is already configured on a Layer 2 interface and you apply a new IP access
list or MAC access list to the interface, the new ACL replaces the previously configured one.
Note
Router ACLs
You can apply router ACLs on switch virtual interfaces (SVIs), which are Layer 3 interfaces to VLANs; on
physical Layer 3 interfaces; and on Layer 3 EtherChannel interfaces. You apply router ACLs on interfaces
for specific directions (inbound or outbound). You can apply one router ACL in each direction on an interface.
The switch supports these access lists for IPv4 traffic:
• Standard IP access lists use source addresses for matching operations.
• Extended IP access lists use source and destination addresses and optional protocol type information
for matching operations.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
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Information About Access Control Lists