If its ip or mpls inorder to make your multilink work you need to have the physical links getting terminated in same router on both the sides without which you cant bundle them up to use as a single link.
If you have 2 or more physical links in a multilink bundle if one of the links goes down and others are up the connectivity will still remain up coz the other links will be there to forward the traffic.
if they are only providing the last mile and getz ur site connected to the remote site and also if all the 3 links are terminating on same router on both your sites/locations ,then its very much possible to have multilink bundle.
but do take care of the link quality before adding them in multilink bundle coz errors/drops in one of the link may also cause some performance issue with the whole multilink bundle.
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