Configuring Flex Links; Understanding Flex Links - Cisco 7604 Configuration Manual

Ios software configuration guide

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Configuring Flex Links

This chapter describes how to configure Flex Links on the Cisco 7600 series router.

Release 12.2(18)SXF and later releases support Flex Links.

For complete syntax and usage information for the commands used in this chapter, refer to the Cisco IOS

Master Command List, Release 12.2SX, at this URL:

The chapter consists of these sections:

For additional information (including configuration examples and troubleshooting information), see the

documents listed on this page:

http://www.cisco.com/en/US/products/hw/routers/ps368/tsd_products_support_series_home.html

Flex Links are a pair of a Layer 2 interfaces (switchports or port channels), where one interface is

configured to act as a backup to the other. Flex Links are typically configured in service-provider or

enterprise networks where customers do not want to run STP. Flex Links provide link-level redundancy

that is an alternative to Spanning Tree Protocol (STP). STP is automatically disabled on Flex Links

To configure the Flex Links feature, you configure one Layer 2 interface as the standby link for the link

that you want to be primary. With Flex Links configured for a pair of interfaces, only one of the

interfaces is in the linkup state and is forwarding traffic. If the primary link shuts down, the standby link

starts forwarding traffic. When the inactive link comes back up, it goes into standby mode.

configured as Flex Links, only one of the interfaces is forwarding traffic and the other one is in standby

mode. If port 1 is the active link, it begins forwarding traffic between port 1 and router B; the link

http://www.cisco.com/en/US/docs/ios/mcl/122sxmcl/12_2sx_mcl_book.html

Understanding Flex Links, page 11-1

Configuring Flex Links, page 11-2

Monitoring Flex Links, page 11-4

11-1, ports 1 and 2 on router A are connected to uplink routers B and C. Because they are

Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX

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