Connect & Configure Cisco Networking Devices: Part 2

Table of Contents

1. Main Menu
2. Part 2: Basic Switch Operation and Configuration
3. 2.1: LAN Switching
4. LAN Switching Continued
5. 2.2: Basic Configuration Commands
6. 2.2.1: Privilege Exec Mode Commands
7. 2.2.1: Global Configuration Mode Commands
8. 2.2.3: Line Mode Commands
9. 2.3: Displaying the contents of the MAC Address Table
10. 2.4: Switch Interfaces
11. Switch Interface Configuration Continued
12. 2.5: Assigning an IP Address & Default Gateway to a 2950 Switch
13. 2.6: Configuring Port Security
14. Video: Basic Switch and Port Security Configuration
15. 2.7: The Spanning Tree Protocol (STP)
16. 2.7.2: STP Port States
17. 2.7.3: STP Configuration
18. Review Questions for Part 2

2.3: Displaying the contents of the MAC Address Table

The switch uses the MAC Address table to forward traffic between ports. These tables include dynamic and static addresses.

The following command can be used from the PRIVILEGE EXEC Mode Switch#'

SHOW MAC-ADDRESS-TABLE

This will display the contents of the Switch MAC Address table held in RAM. The

SHOW MAC-ADDRESS-TABLE DYNAMIC command will show the dynamically learned MAC addresses and can be used as an alternative or SHOW MAC-ADDRESS-TABLE STATIC command will show the statically assigned MAC addresses

Dynamic source MAC addresses are learnt by the switch and then dropped when not in use. All addresses are aged from the table after a predetermined time.

The previous screen shot shows the MAC Address table on a 2950 Switch connected via interface Fa0/7 to a PC with the dynamically learned MAC Address of 0002.e316.f35c.