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Series 3: How do I enable Load Balancing on my CradlePoint router?

If  you are unsure of the Series and model of the CradlePoint router, click here.

This article was written based on Series 3 firmware version 5.0.0.


Load-Balancing allows multiple WAN connections to be used concurrently to improve bandwidth reliability with a CradlePoint Series 3 router. This feature effectively increases the data transfer throughput by using any connected modem interfaces consecutively. Please see this article for a high-level explanation of CradlePoint’s Load Balancing implementation. This article describes the necessary steps to enable Load Balancing on your Series 3 CradlePoint router.

MBR1400 Load-Balancing Limitations

There are 5 USB & ExpressCard connectors for modems on an MBR1400, which are provided to give users the maximum flexibility in choosing modems to use with the Series 3 Router. The limitations of their use are outlined below:

  • The power budget of the MBR1400 allows a maximum of 2 cellular modems to be actively connected and transmitting data at one time.  These 2 modems can be any combination of LTE/WiMAX/HSPA+/EVDO.
  • Version 3.3.0 or greater is required to support 2 simultaneous LTE or WiMAX modems.
  • 2 additional modems are allowed if configured in a non-connected/standby mode.
  • A “dual-mode” modem typically can only connect to one mode at a time and counts as 1 modem load.


  1. Log into the Setup Pages of your CradlePoint router. Click here if you are not sure how to do this.
  2. Click on the Internet tab and select Connection Manager from the drop-down menu.  User-added image                                                                       
  3. Within the “WAN Interfaces” list, check the boxes in the Load Balancing column to specify which devices you would like to load balance across.                                                                                          User-added image
  4. Click on the Internet tab and select WAN Affinity/Load Balancing from the drop-down menu. User-added image
  5. Click the down arrow beside the Load Balance Algorithm field to select the needed option.  User-added image
    • Spillover: This was the default algorithm in the version 3 firmware.  Load is always given to devices with the most available bandwidth.  The estimated bandwidth rate is based on a combination of the upload and download configuration values and the observed capabilities of the device.
    • Round-Robin:  Evenly distribute each session to the available WAN connections.
    • Rate: Distribute load based on the current upload and download rates.  A WAN device’s upload and download bandwidth values can be set in the Connection Manager page.
    • Device Usage:  This mode works in concert with the Data Usage feature.  The router will make best effort to keep data usage between interfaces at a similar percentage of the assigned data cap in the Data Usage rule for each interface, rather than distributing sessions based solely on bandwidth.  For proper function, you need to create data usage rules for each WAN device you will be load balancing.  Make certain to select the “Use with Load Balancing” checkbox in the Data Usage rule editor.
  6. Press the Apply button to submit the setting.

Category: Cradlepoint Series 3

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