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The NIC 1 port is the uppermost Ethernet port on the rear of the TM1-MK3+ system controller. NIC 1
supports the redundancy system and is used for communications between the units. Connection to
external equipment can be via either of the NIC ports.
Virtual IP Addresses (VIPs)
The system utilises VIPs to simplify any external communications to either TSL equipment (such as control
panels or GPIO expansion) and to third-party equipment (such as routers and switchers). The VIPs (one
per NIC) are dynamically applied to the currently active unit. In the event of a failover, either manual or
automatic, the VIP is removed from the previously active unit and then applied to the newly active unit.
This mechanism allows for an almost seamless transition in the event of a failover, with the same IP
address being used so that external equipment can continue to communicate to the TallyMan control
system.
The VIP mechanism has a failsafe to prevent both TM1-Mk3+ system controllers using the same address
at the same time. In most cases, the VIP is disabled from the deactivating unit then enabled to the
activating unit. The activating unit will not enable the VIPs until it can be certain the VIPs have been
disabled on the deactivating unit. If this procedure cannot be completed, the Backup unit can shut down
the Primary unit to ensure that the VIPs are not being used.
IP Address and VIP assignment example
The table below shows some example settings for IP addresses and VIPs on TallyMan equipment in a
redundant setup.
Under normal operation, the Primary is Active, and hosts the Virtual IP addresses:
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