Cisco 2950 Software Configuration Guide - Page 554
Applying ACLs to a Terminal Line, Applying ACLs to a Physical Interface
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Applying ACLs to Terminal Lines or Physical Interfaces Chapter 29 Configuring Network Security with ACLs 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: • 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 "Management VLAN" section on page 7-16. 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: Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Command configure terminal line [console | vty] line-number access-class access-list-number {in} end show running-config copy running-config startup-config 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. Applying ACLs to a Physical Interface Beginning in privileged EXEC mode, follow these steps to control access to a Layer 2 interface: Step 1 Step 2 Step 3 Command Purpose configure terminal Enter global configuration mode. interface interface-id 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. ip access-group {access-list-number | Control access to the specified interface. name} {in} 29-20 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10
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