Cisco Catalyst 4500 Series, Software Configuration Manual

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4-28
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 4 Administering the Switch
Managing the MAC Address Table
This example shows how to configure a login banner for the switch by using the dollar sign ($) symbol
as the beginning and ending delimiter:
Switch# configuration terminal
Switch(config)#
banner login $
Access for authorized users only. Please enter your username and password.
$
Switch(config)#
end
Switch#
Managing the MAC Address Table
The MAC address table contains address information that the switch uses to forward traffic between
ports. All MAC addresses in the address table are associated with one or more ports. The address table
includes these types of addresses:
•
Dynamic address—A source MAC address that the switch learns and then ages when it is not in use.
• Static address—A manually entered unicast address that does not age and that is not lost when the
switch resets.
The address table lists the destination MAC address, the associated VLAN ID, and port number
associated with the address and the type (static or dynamic).
Note
For complete syntax and usage information for the commands used in this section, see the command
reference for this release.
These sections contain this configuration information:
• Building the Address Table, page 4-28
•
MAC Addresses and VLANs, page 4-29
•
Default MAC Address Table Configuration, page 4-30
•
Changing the Address Aging Time, page 4-30
• Removing Dynamic Address Entries, page 4-31
•
Configuring MAC Change Notification Traps, page 4-31
• Configuring MAC Move Notification Traps, page 4-33
•
Configuring MAC Threshold Notification Traps, page 4-35
• Adding and Removing Static Address Entries, page 4-36
•
Configuring Unicast MAC Address Filtering, page 4-37
• Disabling MAC Address Learning on a VLAN, page 4-39
•
Displaying Address Table Entries, page 4-44
Building the Address Table
With multiple MAC addresses supported on all ports, you can connect any port on the switch to
individual workstations, repeaters, switches, routers, or other network devices. The switch provides
dynamic addressing by learning the source address of packets it receives on each port and adding the