CHAPTER
7-1
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
78-14064-04
7
Configuring LAN Ports for Layer 2 Switching
This chapter describes how to use the command-line interface (CLI) to configure Ethernet, Fast Ethernet,
Gigabit Ethernet, and 10-Gigabit Ethernet LAN ports for Layer 2 switching on the Cisco 7600 series
routers. The configuration tasks in this chapter apply to LAN ports on LAN switching modules and to
the LAN ports on the supervisor engine.
Note For complete syntax and usage information for the commands used in this chapter, refer to the
Cisco 7600 Series Router Cisco IOS Command Reference publication.
This chapter consists of these sections:
• Understanding How Layer 2 Switching Works, page 7-1
• Default Layer 2 LAN Interface Configuration, page 7-5
• Layer 2 LAN Interface Configuration Guidelines and Restrictions, page 7-6
• Configuring LAN Interfaces for Layer 2 Switching, page 7-7
Note To configure Layer 3 interfaces, see Chapter 12, “Configuring Layer 3 Interfaces.”
Understanding How Layer 2 Switching Works
These sections describe how Layer 2 switching works on the Cisco 7600 series routers:
• Understanding Layer 2 Ethernet Switching, page 7-1
• Understanding VLAN Trunks, page 7-2
• Layer 2 LAN Port Modes, page 7-4
Understanding Layer 2 Ethernet Switching
These sections describe Layer 2 Ethernet switching:
• Layer 2 Ethernet Switching Overview, page 7-2
• Switching Frames Between Segments, page 7-2
• Building the Address Table, page 7-2
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