DMVPN load balancing

Unanswered Question
Feb 5th, 2009

Hi,

We have DMVPN phase 3 configured in our WAN with Two Hubs and 12 spokes.

I want to have half of the sopke goes to one Hub and another half to another hub.

We have 30 Meg Bandwith in each Hub and one of the hub link is iddle "not much used". Want to do load balancing to optmize the link that we are buying.

We use OSPF as routing protocol.

Any help how to achieve this.

Thanks

Tayeb

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Giuseppe Larosa Thu, 02/05/2009 - 05:54

Hello Tayeb,

are you suing two DMVPN cloulds = two mGRE tunnels on each spoke routers or both hubs are in a single cloud (single mGRE tunnel on spokes).

if the tunnels are two tuning is easy and requires just to play with ip ospf cost so that some spokes point to Hub1.

Otherwise you need to tweak OSPF over the single GRE tunnel:

you need to move to a different OSPF network type:

point-to-multipoint non-broadcast

this peculiar OSPF network type allows to use the command

neigh x.x.x.x cost w

in this way you can specify different costs for different neighbors and this should allow you to implement some form of load-balancing

But this is something that you should test in lab, there can be some issues to be solved so I recommend lab testing of proposed solution.

Hope to help

Giuseppe

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