Introduction to the SM States
Refer to Figure 30-1 on page 854. A SM can be in one of four possible states:
Master state. This is the state an SM is in when it is actively managing the devices in the subnet. Only one SM may be in the Master state during a given period of time.
Standby state. While in the Standby state, an SM periodically polls the Master SM to determine if it is still actively managing the subnet or has failed. More than one SM in a subnet can be in the Standby state.
Discovering state. This is the startup state for all SMs. While in this state, an SM is actively probing the subnet (described in “Discovery” on page 871) to determine the type of devices that populate the subnet and whether or not there are additional SMs within ...
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