Applying Acls To A Terminal Line; Applying Acls To A Physical Interface - Cisco 2950 - Catalyst Switch Configuration Manual

Applying ACLs to Terminal Lines or Physical Interfaces
After you create an ACL, you can apply it to one or more management interfaces or terminal lines. ACLs
can be applied on inbound interfaces. This section describes how to accomplish this task for both
terminal lines and network interfaces. Note these guidelines:
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Applying ACLs to a Terminal Line

Beginning in privileged EXEC mode, follow these steps to restrict incoming connections between a
virtual terminal line and the addresses in an ACL:
Command
Step 1
configure terminal
Step 2
line [console | vty] line-number
Step 3 access-class access-list-number {in}
Step 4 end
Step 5
show running-config
Step 6
copy running-config startup-config

Applying ACLs to a Physical Interface

Beginning in privileged EXEC mode, follow these steps to control access to a Layer 2 interface:
Command
Step 1
configure terminal
Step 2 interface interface-id
Step 3 ip access-group {access-list-number |
name} {in}
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
29-20
When controlling access to a line, you must use numbered IP ACLs or MAC extended ACLs.
When controlling access to an interface, you can use named or numbered ACLs.
Set identical restrictions on all the virtual terminal lines because a user can attempt to connect to
any of them.
If you apply ACLs to a management interface, the ACL only filters packets that are intended for the
CPU, such as SNMP, Telnet, or web traffic.
If you apply ACLs to a management VLAN, see the
Purpose
Enter global configuration mode.
Identify a specific line for configuration, and enter in-line configuration
mode.
Enter console for the console terminal line. The console port is DCE.
Enter vty for a virtual terminal for remote console access.
The line-number is the first line number in a contiguous group that you want
to configure when the line type is specified. The range is from 0 to 16.
Restrict incoming and outgoing connections between a particular virtual
terminal line (into a device) and the addresses in an access list.
Return to privileged EXEC mode.
Display the access list configuration.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Identify a specific interface for configuration and enter interface
configuration mode.
The interface must be a Layer 2 or management interface or a management
interface VLAN ID.
Control access to the specified interface.
Chapter 29 Configuring Network Security with ACLs
"Management VLAN" section on page 7-16.
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