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amzandu
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Joined: Tue Jun 07, 2011 7:46 am

MPLS MS EXCHANGE ACCESS PROBLEM

Mon Jul 18, 2011 8:29 pm

We have provisioned an L3 MPLS service for a client with 3 sites. The 3 sites have to access an MS Exchange Server hosted on another provider's network with whom we peer through an NNI.

Our problem is that MS Exchange MAPI access does not work for all client sites. It does work however, when GRE tunnels are run inside the MPLS to the other provider's side of the NNI. All other network services work very well.

Our network has an MTU of 1518 and above, while MPLS MTU is set to 1508. The client sites' VRF is able to achieve 1500 byte passage through our network without fragmentation.

Has anyone else encountered anything similar, or have any suggestions as to what might be causing this behaviour.

Thanks

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