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Scenario: Device 192.168.1.100 shall reach “target” over “master” or if interrupted over “backup”

              	           +----------+------------+ 
                           |     device            | 
                           |     192.168.1.100/24  |
		           |     GW:192.168.1.10   |
                           +----------+------------+ 
                                      | 
                                      |
                                      |
               +----------------------+------------------------+
               |                                               |
               |                                               |  
    +----------+------------+                       +----------+------------+
    |   NBXXXX              | virtual device/GW     |                       |
    |   master NBXXXX       | master = 192.168.1.10 |  backup e.g. Cisco  |                 
    |   192.168.1.1/24      |                       |  192.168.1.2/24       |
    +----------+------------+                       +----------+------------+               
               . Mobile                      		       |  ETHX
               .                                               |
               ..................         +--------------------+
                                .         |
                          +-----+---------+-----+
                          |                     |
                          |       Internet      |
                          |                     |
                          +----------+----------+               
                                     |
                                     | 
                                +----+----+
                                |         |
                                | target  |
                                +---------+

Configuration: Redundacy

In order that vrrp detects a connection failure on WAN side Supervision must be activated: