Contents
vii
Catalyst 2940 Switch Software Configuration Guide
78-15507-02
Understanding DNS 6-16
Default DNS Configuration 6-17
Setting Up DNS 6-17
Displaying the DNS Configuration 6-18
Creating a Banner 6-18
Default Banner Configuration 6-18
Configuring a Message-of-the-Day Login Banner 6-19
Configuring a Login Banner 6-20
Managing the MAC Address Table 6-20
Building the Address Table 6-21
MAC Addresses and VLANs 6-21
Default MAC Address Table Configuration 6-22
Changing the Address Aging Time 6-22
Removing Dynamic Address Entries 6-23
Configuring MAC Address Notification Traps 6-23
Adding and Removing Static Address Entries 6-25
Displaying Address Table Entries 6-26
Managing the ARP Table 6-26
CHAPTER
7Configuring Switch-Based Authentication 7-1
Preventing Unauthorized Access to Your Switch 7-1
Protecting Access to Privileged EXEC Commands 7-2
Default Password and Privilege Level Configuration 7-2
Setting or Changing a Static Enable Password 7-3
Protecting Enable and Enable Secret Passwords with Encryption 7-4
Setting a Telnet Password for a Terminal Line 7-5
Configuring Username and Password Pairs 7-6
Configuring Multiple Privilege Levels 7-7
Setting the Privilege Level for a Command 7-7
Changing the Default Privilege Level for Lines 7-8
Logging into and Exiting a Privilege Level 7-9
Controlling Switch Access with TACACS+ 7-9
Understanding TACACS+ 7-9
TACACS+ Operation 7-11
Configuring TACACS+ 7-11
Default TACACS+ Configuration 7-12
Identifying the TACACS+ Server Host and Setting the Authentication Key 7-12
Configuring TACACS+ Login Authentication 7-13