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CHAPTER

23-1

Catalyst 3750-X and 3560-X Switch Software Configuration Guide

OL-21521-01

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-X

or 3560-X switch that provide a mutual backup. It a

lso 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 Catalyst 3750-X or 3560-X standalone switch

d to a Catalyst 3750-X 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 23-1

• Configuring Flex Links and MAC Address-Table Move Update, page 23-7

• Monitoring Flex Links and the MAC Address-Table Move Update, page 23-14

Understanding Flex Links and the MAC Address-Table Move

Update

This section contains this information:

• Flex Links, page 23-1

• VLAN Flex Link Load Balancing and Support, page 23-2

• Flex Link Multicast Fast Convergence, page 23-3

• MAC Address-Table Move Update, page 23-6

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

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