Cisco Catalyst 3560-X

CHAPTER
1-1
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-25303-03
1
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 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 Catalyst 3750-X or 3560-X standalone switch
and 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 1-1
• Configuring Flex Links and MAC Address-Table Move Update, page 1-7
• Monitoring Flex Links and the MAC Address-Table Move Update, page 1-14
Understanding Flex Links and the MAC Address-Table Move
Update
This section contains this information:
• Flex Links, page 1-1
• VLAN Flex Link Load Balancing and Support, page 1-2
• Flex Link Multicast Fast Convergence, page 1-3
• MAC Address-Table Move Update, page 1-6
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