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WAN Redundancy Setup

terry.lowe
Level 1
Level 1

Hi guys,

I have this scenario with two routers at the HQ - a primary router (with 3 dedicated point-to-point links to 3 different remote sites) and a secondary router (a standby router with a single route able to connect to all 3 sites via a Central Remote Site Network).


The objective of this setup is to have:   

    1. Router fail-over at HQ - in the event of the primary router failing;
    2. Route fail-over - in the event where the dedicated links at 1 or 2 of the remote sites fail;

An image of this scenario can be found attached. 


There seems to be an issue where as if the link goes down at 1 or 2 of the 3 links to remote sites, the secondary router with the backup link to all sites will still remain in standby mode, as the primary router is still active. In order prompt the secondary router to be active, the primary router will need to be switched off, which is definitely not quite ideal as it will affect the other remaining active links. 

To resolve this matter, one way I believe is to have another single route backup link to connect to the primary router and configure this as a floating static (as seen in the attached image with the green dashed line). However would like to hear other possible alternatives in order to achieve this scenario's objectives.

Looking forward to suggestions and comments to help solidify this scenario.

Thanks in advance!

4 Replies 4

Philip D'Ath
VIP Alumni
VIP Alumni

The easiest option is to use Cisco DMVPN technology.  You create two clouds, primary and secondary.

This is the guide to the Cisco Validated Design with all the configs on how to set this up.

http://www.cisco.com/c/dam/en/us/td/docs/solutions/CVD/Aug2014/CVD-VPNWANDesignGuide-AUG14.pdf

Hi Philip,

Thank you for the input.

Do correct me if I'm wrong, but does DMVPN require Internet as a medium?

This scenario will not be connecting via Internet but rather through a metro-e network.   

Ok great!

Thanks Philip. Will explore a little more on the two options recommended.

Appreciate it.