http://gns3vault.com Backup interfaces are another method to deal with layer 2 loop-free topologies. You can configure an interface to be "active" with another interface as "backup". Spanning tree will be disabled for these interfaces and the backup interface only works when the active interface fails. This video walks you through the configuration.
Watch video Flex Links Backup Interface lab on Cisco Catalyst Switch online without registration, duration hours minute second in high quality. This video was added by user GNS3Vault 28 April 2012, don't forget to share it with your friends and acquaintances, it has been viewed on our site 10,691 once and liked it 40 people.