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CHAPTER
21-1
Catalyst 3750 Switch Software Configuration Guide
OL-8550-09
21
Configuring Flex Links and the MAC
Address-Table Move Update Feature
This chapter describes how to configure Flex Links, a pair of interfaces on the Catalyst 3750 switch that
provide a mutual backup. It also describes how to configure the MAC address-table move update feature,
also referred to as the Flex Links bidirectional fast convergence feature. Unless otherwise noted, the term
switch refers to a standalone switch and to a switch stack.
Note For complete syntax and usage information for the commands used in this chapter, see the command
reference for this release.
The chapter consists of these sections:
• Understanding Flex Links and the MAC Address-Table Move Update, page 21-1
• Configuring Flex Links and the MAC Address-Table Move Update, page 21-7
• Monitoring Flex Links and the MAC Address-Table Move Update, page 21-14
Understanding Flex Links and the MAC Address-Table
Move Update
This section contains this information:
• Flex Links, page 21-1
• VLAN Flex Link Load Balancing and Support, page 21-3
• Flex Link Multicast Fast Convergence, page 21-3
• MAC Address-Table Move Update, page 21-6
Flex Links
Flex Links are a pair of a Layer 2 interfaces (switch ports or port channels) where one interface is
configured to act as a backup to the other. The feature provides an alternative solution to the Spanning
Tree Protocol (STP). Users can disable STP and still retain basic link redundancy. Flex Links are