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Cisco WS-C2960G-8TC-L Configuración
372
Chapter 12: Initial Switch Configuration
CERTIFICATION OBJECTIVE 12.04
Basic Switch Operation and Verification
This section focuses on the basic operations of a switch, such as learning MAC
addresses and basic verification commands.

MAC Address Table

You'll recall that one of the three main functions of a switch is to learn which
devices—that is, MAC addresses—are associated with which interfaces or ports.
This information is stored in a port address, or content addressable memory (CAM),
table. The learning process was discussed in Chapter 4. You can view the CAM table
by using the show mac-address-table command. Here is an example of the
use of this command, based on the network shown in Figure 12-2:
Switch> show mac address-table
------------------------------------------
Vlan
----
All
All
.
.
.
Total Mac Addresses for this criterion: 12
In this example, all the STATIC entries represent the switch itself. The last three
entries represent the MAC addresses learned from the first three interfaces of the
switch. By default, the 2960 can fit 8192 MAC addresses in its CAM table. To clear
dynamically learned entries from the CAM table, use the clear mac-address-
table command from Privilege EXEC mode.
You shouldn't see a broadcast or multicast addresses in the port address table
since these are not seen as source addresses in frames and thus aren't learned
by the switch.
Mac Address Table
Mac Address
-----------
0000.0000.0001
0000.0000.0002
1
0000.1111.AAAA
1
0000.1111.CCCC
1
0000.1111.BBBB
Type
Ports
----
-----
STATIC
CPU
STATIC
CPU
DYNAMIC
FA0/1
DYNAMIC
FA0/2
DYNAMIC
FA0/3