Ip Access-Group - Cisco Catalyst 2960 Command Reference Manual

ip access-group

ip access-group
Use the ip access-group interface configuration command to control access to a Layer 2 interface. Use
the no form of this command to remove all access groups or the specified access group from the
interface.
Syntax Description
access-list-number
name
in
Defaults No access list is applied to the interface.
Command Modes
Interface configuration
Command History Release
12.2(25)FX
Usage Guidelines
You can apply named or numbered standard or extended IP access lists to an interface. To define an
access list by name, use the ip access-list global configuration command. To define a numbered
access list, use the access list global configuration command. You can used numbered standard access
lists ranging from 1 to 99 and 1300 to 1999 or extended access lists ranging from 100 to 199 and
2000 to 2699.
You can use this command to apply an access list to a Layer 2 interface. However, note these limitations
for port ACLs:
•
•
•
•
For standard inbound access lists, after the switch receives a packet, it checks the source address of the
packet against the access list. IP extended access lists can optionally check other fields in the packet,
such as the destination IP address, protocol type, or port numbers. If the access list permits the packet,
the switch continues to process the packet. If the access list denies the packet, the switch discards the
packet.
If the specified access list does not exist, all packets are passed.
Catalyst 2960 Switch Command Reference
2-118
ip access-group {access-list-number | name} {in}
no ip access-group [access-list-number | name] {in}
The number of the IP access control list (ACL). The range is 1 to 199 or
1300 to 2699.
The name of an IP ACL, specified in the ip access-list global configuration
command.
Specify filtering on inbound packets.
Modification
This command was introduced.
You can only apply ACLs in the inbound direction.
You can only apply one IP ACL and one MAC ACL per interface.
Port ACLs do not support logging; if the log keyword is specified in the IP ACL, it is ignored.
An IP ACL applied to an interface only filters IP packets. To filter non-IP packets, use the mac
access-group interface configuration command with MAC extended ACLs.
Chapter 2 Catalyst 2960 Switch Cisco IOS Commands
OL-8604-04