December 2006
Intermediate to advanced
1188 pages
72h 8m
English
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Using Backup Interfaces
Problem
You want to configure a router to dial only if it sees a physical failure on the primary WAN interface.
Solution
Cisco routers can watch the physical signals on an interface and trigger a backup interface if the primary link fails. The router will automatically drop the call after the primary circuit comes back up:
Router1#configure terminalEnter configuration commands, one per line. End with CNTL/Z. Router1(config)#interfaceRouter1(config-if)#Serial0/0backup delayRouter1(config-if)#0 300backup interfaceRouter1(config-if)#BRI0/0encapsulation frame-relayRouter1(config-if)#down-when-loopedRouter1(config-if)#exitRouter1(config)#interfaceSerial0/0.1point-to-pointRouter1(config-subif)#ip addressRouter1(config-subif)#10.1.1.10 255.255.255.252frame-relay interface-dlciRouter1(config-subif)#50exitRouter1(config)#interfaceRouter1(config-if)#BRI0/0ip addressRouter1(config-if)#10.1.99.55 255.255.255.0encapsulation pppRouter1(config-if)#dialer idle-timeoutRouter1(config-if)#300dialer map ip10.1.99.1namedialhostbroadcastRouter1(config-if)#95551212dialer load-threshold50eitherRouter1(config-if)#dialer-groupRouter1(config-if)#1isdn switch-type basic-niRouter1(config-if)#isdn spid1Router1(config-if)#800555123400 5551234isdn spid2Router1(config-if)#800555123500 5551235ppp authentication chapRouter1(config-if)#ppp multilinkRouter1(config-if)#exitRouter1(config)#dialer-list1protocol ip permitRouter1(config)#endRouter1#
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.