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Heavey Traffic B/w Exchange 2010 Mailbox and CAS/Hub Transport Servers Cause Network

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  • Heavey Traffic B/w Exchange 2010 Mailbox and CAS/Hub Transport Servers Cause Network

    We are experiencing network congestion which is due to two Exchange 2010 servers (Mailbox to HT/CAS) communicating to each other generating heavy traffic in the process and thus congesting the entire network.

    In our case we had 2 DAG each DAG contains 2 Mailbox member servers (one MBX contain active and other passive copy), NLB configured of CAS/HT (installed both roles on each machine),

    when we had network congestion we notice that heavy traffic was generated by Mailbox server MBX1(member server of DAG1) during communication with CAS/HT servers and no error/warning event generated , All application and other services effected due to abnormal heavy traffic.


    disconnection of these Exchange servers uplink from the main network will allow network to function as before. The uplink will be restored after few minutes then no heavy traffic was observed.


    we are experiencing this problem after some days and sometime twice in the day.

    kindly need your urgent suggestion because problem is too much critical.

  • #2
    Re: Heavey Traffic B/w Exchange 2010 Mailbox and CAS/Hub Transport Servers Cause Netw

    1. Configure a dedicated replication network for the DAG so that replication traffic doesn't go through the production network.

    2. All communication between the users and their mailboxes goes through the CAS. All emails flow between the CAS and the Mailbox servers in both directions (inbound and outbound). Make sure that the network connection between the CAS and the Mailbox servers is sufficient (at least 1Gbps).

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