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so by this means your system and network administrator create that WSFC and add all SQL nodes to that WSFC for you ?
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so they install 3 x nodes, join the domain, configure all network for multi site .
MultiSubnetFailover Keyword and Associated Features
MultiSubnetFailover is a new connection string keyword used to enable faster failover with Always On Availability Groups and Always On Failover Cluster Instances in SQL Server 2012. The following three sub-features are enabled when MultiSubnetFailover=True is set in connection string:
Faster multi-subnet failover to a multi-subnet listener for an Always On Availability Group or Failover Cluster Instances.
Faster single subnet failover to a single subnet listener for an Always On Availability Group or Failover Cluster Instances.
This feature is used when connecting to a listener that has a single IP in a single subnet. This performs more aggressive TCP connection retries to speed up single subnet failovers.
Named instance resolution to a multi-subnet Always On Failover Cluster Instance.
This is to add named instance resolution support for an Always On Failover Cluster Instances with multiple subnet endpoints.
MultiSubnetFailover=True Not Supported by NET Framework 3.5 or OLEDB
Issue: If your Availability Group or Failover Cluster Instance has a listener name (known as the network name or Client Access Point in the WSFC Cluster Manager) depending on multiple IP addresses from different subnets, and you are using either ADO.NET with .NET Framework 3.5SP1 or SQL Native Client 11.0 OLEDB, potentially 50% of your client-connection requests to the availability group listener will hit a connection timeout.
Workarounds: We recommend that you do one of the following tasks.
If do not have the permission to manipulate cluster resources, change your connection timeout to 30 seconds (this value results in a 20-second TCP timeout period plus a 10-second buffer).
Pros: If a cross-subnet failover occurs, client recovery time is short.
Cons: Half of the client connections will take more than 20 seconds
If you have the permission to manipulate cluster resources, the more recommended approach is to set the network name of your availability group listener to RegisterAllProvidersIP=0. For more information, see "RegisterAllProvidersIP Setting” later in this section.
Pros: You do not need to increase your client-connection timeout value.
Cons: If a cross-subnet failover occurs, the client recovery time could be 15 minutes or longer, depending on your HostRecordTTL setting and the setting of your cross-site DNS/AD replication schedule.
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so this mean can't create ADDITIONAL listener by using SQL serve SSMS ?
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