Power Up In Forward Mode; Status Snvt Update Time - adept technology GadgetGateway User Manual

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4.10Redundant Twin Conﬁguration Menu

GadgetGateway Serial Interface

router will win the boot up arbitration on the next reboot. The desired active one should

have the higher initial arbitration count. Use this menu option to set the initial arbitration

counts appropriately. The arbitration count is incremented twice per heatbeat time. The

relative difference between initial arbitration counts should set big enough to account for

any variable latency in boot up time. The default is 0. If both nodes are set to zero, which

ever node boots up ﬁrst will go active and start incrementing its arbitration count. The

other node will also go active but because it booted up later its arbitration count will be

lower and will go inactive. The arbitration count will eventually roll over to zero. Thus on

the next arbitration after roll over the active and inactive nodes will switch. Given that the

arbitration count is a 64 bit number, for a heartbeat time of 1 second and a initial arbitra-

tion count of 0, the rollover time is more than 292 billion years.

To reiterate, the initial arbitration count is only going to have an effect if there is an arbi-

tration on bootup. An arbitration only occurs when both nodes are in active forward state.

In order to force the inactive node to be active one must set the arbitration counts on both

nodes and then reboot both nodes

4.10.47 Power up in Forward Mode

Select [6] from the menu and press ENTER.

>>>6

Enter Powerup Forward State

1) Off

2) On

>>>

Enter 1 or 2 and press ENTER. The new value will appear in the menu. Hit Enter without

typing a number and the previous value will be retained.

Because on boot up both routers will default to active, they could also both forward pack-

ets thereby resulting in a spike of duplicate trafﬁc until arbitration completes. Setting this

option to off will disable forwarding of packets by both routers until arbitration completes

and only one router goes active. The default is Off.

Select [7] from the menu and press ENTER.

>>>7

Enter New Status Snvt Update

Time in milliseconds >>>

Enter the new Status SNVT update time and press ENTER. The new value will appear in

the menu. Hit Enter without typing a number and the previous value will be retained.

The twin monitoring application has a status SNVT type 93. If bound the status SNVT is

propagated either on a timer or when it is updated by the monitoring application or both or

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