# Substation RV-FT (Rendezvous Fault Tolerant)

Substation ES RV-FT allows the transport definition to specify from 1 to 3 RV daemon URLs. This is done by using a semi-colon (;) delimited string for the transport URL.

Note: The value for network and service is same.

Example:

    SXTP07D ------------------- ESB Endpoint Extensions ------------------
    Command ===>
    (ECF,SSL,ADMIN)

     ESB Id     ===> RV-SERVER
     Type       ===> R  (E/R EMS or RV)
     Startup    ===> Y  (Y/N Start during Substation Initialization)
     Port       ===> 0
     URL        ===> URL1:7500;URL2:7500;URL3:7500

     Rendezvous Values:
     Service           ===> 8888
     Network           ===> 0   0   0   0    or
     String ===>
     Multicast         ===> N   (N/Y)
     Multicast Address ===>

     EMS Server Connection Credentials:
     User       ===>
     Password   ===>

    TCPIP Stack Name  ===>           (Name of TCP/IP Stack)

When RV-FT type URL is used, Substation ES uses the first daemon to which it can connect successfully followed by the other daemons in the order. Using the above example, `URL1:7500` is the first daemon connected, followed by `URL2:7500` and `URL3:7500` in order.

If the connectivity with the current daemon is lost, Substation ES does the following functions:

- Initiates the connection with the first daemon in the list.
- Attempts to connect with the second daemon, followed by the next daemon in the list in case of connection failure.
- Returns to the current daemon and waits for re-connection if no active daemon is found.

When a connection is made, all Subjects for the transport are set up and the messages start to process.

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