DSL to 4G/3G failover

Unanswered Question
Aug 6th, 2014
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we have a Cisco 2921 with two Internet connections:


The primary connection is a DSL link on an EHWIC-VA-DSL-A, the backup a UMTS/LTE connection  on a EHWIC-4G-LTE-G.


In case the DSL link fails, an automated failover to the second (UMTS/LTE) connection should happen.


Can anyone please provide a best practice configuration example? I´m not sure if the basic IP SLA mechanisms (tracking) are sufficient, or if i have to combine this with the "backup interface" command.


interface ATM0/0/0.1 point-to-point
 backup interface Cellular0/1/0
 pvc 8/32
  pppoe-client dial-pool-number 1


Many thanks!








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Heinz Schwarzfeuer Thu, 08/07/2014 - 14:52
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on one any ideas? 


My main question is if I should configure the backup using the "backup interface" - method which brings up the cell connection automatically if the line protocol of the ADSL connection is down, or if it is better to use IP SLA / tracking only?


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