CHAPTER
24-1
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
24
Configuring Flex Links and MAC Address-Table
Move Update
Flex Links provide a fast and simplified Layer 2 Link redundancy mechanism. This chapter describes
how to configure Flex Links on the Catalyst 4500 series switch. It also describes how to configure the
MAC address-table move update (MMU) feature, also referred to as the Flex Links bidirectional fast
convergence feature.
The chapter consists of these sections:
• About Flex Links, page 24-1
• Configuring Flex Links, page 24-5
• Monitoring Flex Links and the MAC Address-Table Move Update, page 24-12
Note For complete syntax and usage information for the switch commands used in this chapter, see the
Cisco IOS Command Reference Guides for the Catalyst 4500 Series Switch.
If a command is not in the Cisco Catalyst 4500 Series Switch Command Reference , you can locate it in
the Cisco IOS Master Command List, All Releases.
About Flex Links
This section describes this information:
• Flex Links, page 24-1
• VLAN Flex Links Load Balancing and Support, page 24-2
• Flex Links Failover Actions, page 24-3
Flex Links
Flex Links are a pair of Layer 2 interfaces (switch ports or port channels) where one interface is
configured to act as a backup to the other. Users can disable STP and still retain basic link redundancy.
Flex Links are typically configured in service provider or enterprise networks where customers do not
want to run STP on some interfaces.
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