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, duration hours minute second in high quality that is uploaded to the channel GNS3Vault 28 April 2012. Share the link to the video on social media so that your subscribers and friends will also watch this video. This video clip has been viewed 10,691 times and liked it 40 visitors.