User's Manual

Teklogix 9150 Wireless Gateway User Manual 43
Chapter 3: 9150 Main Configuration
Redundancy
The 9150 sends the “Cold Start” Trap on reboot or power up.
Important: Any parameters that are changed in the SNMP Communities and
Trap Receivers menu must also be changed in the mapRF manager.
3.4.4 Redundancy
The Redundancy Parameters “Configure” page, entered from the Configuration
Main Menu page, allows the user to set various options for the redundant (backup)
operation of the 9150.
This feature enables two similarly-configured 9150s to operate in parallel. One
9150 is designated as the primary 9150, and manages communication to the rest
of the Teklogix system. The other 9150 is designated as the secondary 9150, and
remains idle. Both 9150s communicate with one or two arbiters, an extremely stable
device on the network, such as a host, which serves as a reference for the status of
the network itself.
Both the primary and secondary 9150s must be connected to the network, and each
9150 is aware of the other’s IP address. The secondary 9150 polls the primary 9150,
and the primary 9150 responds, exchanging information about their status. There
may not be more than one secondary 9150.
If the secondary 9150 cannot communicate with the primary 9150, but can commu-
nicate with one or both arbiters, it assumes that the primary 9150 is not working.
It then becomes the primary and assumes control of the Teklogix backbone on
the network.
When the first 9150 comes online again, it assumes secondary status while the
second 9150 continues as the primary. If the 9150’s cannot communicate with the
arbiter, they assume that the network is not working.