I am an extremely unhappy camper right now. Last week I set up a DAG for Exchange 2010 SP3 running on Win 2012 Server. Worked fine. Set up like so:
ex01 - 172.16.1.141 - mapi network
10.10.10.141 - replication network
MBX, CAS, HUB
ex02 - 172.16.1.66 - mapi network
10.10.10.66 - replication network
MBX, CAS, HUB
srvr01 - 172.16.1.217 - File Witness Server
No Exchange loaded
exo1 mbx database replicated to ex02
ex02 mbx database replicated to ex01
was working fine. tested switchover, worked fine. booted ex01 and failed over to ex02 with no problem. then all put back to normal.
Today I replaced a network switch which ex01 10.10.10.141 was connected.
Just powered off, replaced it and plugged the LAN back into it.
ex01 mbx database successfully failed over to ex02. Running fine. HOWEVER,
in EMC, there are now no network interfaces, where before they were there. The MAPI Network and Replication network subnets status are both unknown. In the Failover Management Console, Node ex01 is DOWN. When I validate the cluster, it says the connections exist between the nodes, but it cannot ping ex01 to ex02 or ex02 to ex01 on the replication (10.0.0.0/8) subnet.
I have done everything I can think up to get this network connection working.... booting, powering off, uninstalling the NIC and reconfiguring it. Both ex servers show node ex01 as down and no NIC info for the interfaces. Need some help. Please advise. Thanks.