DAG Network - specify specific MAPI / Replication network ?

jibbajabba

Just wondering, I configured the network interfaces used by DAG according to this article

Planning for High Availability and Site Resilience: Exchange 2010 SP1 Help

When I check the configuration it appears that both networks using Mapi and Replication.
I know it normally fails back any if a network becomes unavailable, but I am still curious if there is a way to specify a particular network for a particular DAG role?

Here the output of Get-DatabaseAvailabilityGroupNetwork -Identity 'DAG-1' | fl

RunspaceId         : 85546da9-1e9d-4d48-8519-989ed48844d6
Name               : DAGNetwork01
Description        :
Subnets            : {{192.168.32.0/20,Up}}
Interfaces         : {{dcmbcas-1,Up,192.168.43.101}, {DCMBCAS-2,Up,192.168.43.103}}
MapiAccessEnabled  : True
ReplicationEnabled : True
IgnoreNetwork      : False
Identity           : DAG-1\DAGNetwork01
IsValid            : True

RunspaceId         : 85546da9-1e9d-4d48-8519-989ed48844d6
Name               : DAGNetwork02
Description        :
Subnets            : {{85.xx.xx.0/23,Up}}
Interfaces         : {{dcmbcas-1,Up,85.xx.xx.xx}, {DCMBCAS-2,Up,85.xx.xx.xx}}
MapiAccessEnabled  : True
ReplicationEnabled : True
IgnoreNetwork      : False
Identity           : DAG-1\DAGNetwork02
IsValid            : True

As far as I can see it appears that it is assigning the "role" based on the network configurations, but it clearly doesn't ... Can you "pipe" MapiAccessEnabled somehow ?

jibbajabba

Looks like you can only use ReplicationEnabled and set it to $false, even through PS, but not for MAPI - ah well ..

royal

The way a network is enabled for MAPI is by having that particular's network IP Address in DNS. It is only supported to have only MAPI network thus meaning only 1 IP on a DAG member should be registered in DNS. All other networks should not be registered in DNS and should be enabled for replication.

jibbajabba

royal wrote: »

The way a network is enabled for MAPI is by having that particular's network IP Address in DNS. It is only supported to have only MAPI network thus meaning only 1 IP on a DAG member should be registered in DNS. All other networks should not be registered in DNS and should be enabled for replication.

Trouble is if that particular server is a DC and DNS server as well. You can change the NICs to not updated itself in DNS, but being a DC it will still register both IPs in DNS and even more importantly (annoying) using the same hostname, hence round robin the DNS ..

I did try to disable dynamic updates even through the registry - but it doesn't seem to work either ....

Marwa Egypt

Hi,

i have configer my first DAG , when u click on ur DAG at EMC u willl c at the bottom the DAG associated networks , u can click on the 1 u made for MAPI & click proprties , then remove enable replication check box & test again u will find it correct but i don't know how to disable MAPI on the network.

Regards

jibbajabba

Already found the solution a while ago. What network is used for what is specified by the settings on the network adapter itself. I don't have the link handy right now (iPhone) but on the planning site for DAG Microsoft specifies what exact settings are required on the NIC for what network.

royal

Marwa Egypt wrote: »

but i don't know how to disable MAPI on the network.

I answered this in my post.

jibbajabba

royal wrote: »

I answered this in my post.

Kinda

Anyway, here the settings required for each specific network ... if you use the proper setting, Exchange uses the right network for either MAPI and / or Replication