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Configuration of Failover and Failback

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Configuration of Failover and Failback


Products Supported: AER2100, MBR1400v2, MBR1200B, MBR95, CBA750, CBR4x0, IBR6x0, CTR35. Click here to identify your router.

Firmware Version: 5.3.0 - for information on upgrading firmware, click here.

Firmware version 6.0 has been released and introduces a vastly improved GUI for all current Series 3 routers.  Cradlepoint has created new Knowledge Base articles with updated screen shots and instructions for the new GUI layout.  As a result, this article has received its final update.  To view the version of this Knowledge Base article for Firmware 6.0 and Later please click here.


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Summary

Configuration

Related Articles


Summary

Most but not all Series 3 Cradlepoint routers can connect to more than one Internet (WAN) service. If there are more than one WAN sources available the priority of the WAN connections can be specified and the Cradlepoint router will automatically switch over to the next available connection upon a WAN failure.

For example, both a wired Ethernet connection (DSL, cable, satellite, T1, etc) and a USB cellular data modem. By default the router will use the wired connection as the primary connection and if the wired WAN connection fails it will fail over to the cellular modem.

If using a Cradlepoint product that allows for multiple cellular modems or multiple wired WAN connections, it is also possible to specify the order in which the WAN connections will be used. The Cradlepoint router can also be configured to actively ping a target to verify the Ethernet WAN connection state.


Configuration

Configuration Difficulty: Beginner


Before configuring the Failover and Failback settings in the Cradlepoint router, verify that each connection works independently.

  • Step 1: Log into the router's Setup Page. For help with logging in please click here.
  • Step 2: Click the Internet tab then select Connection Manager from the drop-down menu.
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  • Step 3: The WAN Interfaces page displays the priority and status of all available WAN interfaces. In this example, the Cradlepoint MBR1400 has a wired Ethernet connection attached to the Blue WAN port, a Sprint Sierra Wireless 250U 3G/4G modem in the USB 1 slot, and a Verizon Novatel MC760 3G modem in the USB 2 slot.
  • Step 4: The Ethernet Port (shown with a green circle) is the WAN interface currently connected. The cellular modems are in the Available state in case the Ethernet connection fails. Because Load Balance is not enabled, the router will only use the available interface with the highest priority.
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  • Step 5: To change the Failure Check settings for the Ethernet port (or any other port) select the interface by clicking on it and then clicking the Edit button.
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  • Step 6: In the WAN Configuration select the General Settings tab and expand the Advanced IPv4 Failure Check section. (Advanced IPv4 Failure Check is not available on the CTR35 or MBR95)
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  • Step 7: To have the router monitor the status of the WAN interface while connected change the Monitor while connected option to Active DNS. The Idle Check Interval refers to how often the Cradlepoint will check the connection. If the Cradlepoint does not receive a response, it will verify the failure was not a one off error and after five(5) successive failures, it will automatically initiate failover to the next available WAN interface.
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  • Step 8: By default, the Cradlepoint will failback to the highest priority interface once there is at least 20 KB/s of available bandwidth on the interface. To change the Failback options, expand the Advanced Failback Configuration section on the WAN Configuration page.
    • Rate sets the requirement for how much available bandwidth must be met for Failback.
    • Time Period sets the requirement for minimum time the bandwidth must be available before Failback can occur.
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  • Step 9: Click Submit to save settings.
  • Step 10: To change the failover priority for your WAN interfaces, use the up and down arrows in the WAN Interfaces box. This example shows that the Verizon MC760 modem has been moved to a higher priority than the Sprint 250U modem. This setting will ensure that if the Ethernet connection fails, the router will next use the Verizon MC760 modem before using the Sprint 250U modem.
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  • Step 11: For Cradlepoint Products that support Load Balancing, it is possible to have one or more cellular modem(s) provide a load balanced connection. The screenshot below shows that the Sierra Wireless 4G modem and Verizon 3G modems have both been added to the Load Balancing pool. With these settings, the Cradlepoint will automatically Load Balance the Ethernet connection if a Certain bandwidth threshold is reached on that interface. For more information about configuring load balancing, refer to Load Balancing Configuration.
    • Note: Cradlepoint products that do not support Load Balancing will not be able to use more than one WAN interface at the same time.
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Published Date: 12/17/2014

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