CHAPTER
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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
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44
Configuring Fallback Bridging
This chapter describes how to configure fallback bridging (VLAN bridging) on the Catalyst 3750-E
or 3560-E switch. With fallback bridging, you can forward non-IP packets that the switch does not route
between VLAN bridge domains and routed ports.
To use this feature, the switch or stack master must be running the IP services feature set. Unless
otherwise noted, the term switch refers to a Catalyst 3750-E or 3560-E standalone switch and to a
Catalyst 3750-E switch stack.
Note For complete syntax and usage information for the commands used in this chapter, see the Cisco IOS
Bridging and IBM Networking Command Reference, Volume 1 of 2, Release 12.2.
This chapter consists of these sections:
• Understanding Fallback Bridging, page 44-1
• Configuring Fallback Bridging, page 44-3
• Monitoring and Maintaining Fallback Bridging, page 44-11
Understanding Fallback Bridging
These sections describe how fallback bridging works:
• Fallback Bridging Overview, page 44-1
• Fallback Bridging and Switch Stacks, page 44-3
Fallback Bridging Overview
With fallback bridging, the switch bridges together two or more VLANs or routed ports, essentially
connecting multiple VLANs within one bridge domain. Fallback bridging forwards traffic that the
switch does not route and forwards traffic belonging to a nonroutable protocol such as DECnet.
