Nortel Web OS Switch Software Application Manual page 281

Web OS 10.0 Application Guide
If one server attached to Web switch 1 fails, then Web switch 1's priority will be reduced by 6
to 123. Since 123 is greater than 120 (Web switch 2's priority), Web switch 1 will remain the
master.
If a second server attached to Web switch 1 fails, then Web switch 1's priority will be reduced
by 6 more to 117. Since 117 is less than 120 (Web switch 2's priority), then Web switch 2 will
become the Master. At this point, Web switch 1's priority will fall by 5 more and Web switch
2's will rise by 5 because the switches are tracking how many Masters they are running. So,
Web switch 1's priority will settle out at 112 and Web switch 2's priority at 125.
When both servers are restored to Web switch 1, that switch's priority will rise by 12 (2 healthy
real servers X 6 per healthy server) to 124. Since 124 is less than 125, Web switch 2 will
remain the master.
If, at this point, a server fails on Web switch 2, its priority will fall by 6 to 119. Since 119 is less
than 124, Web switch 1 will become the Master. Its priority will settle out at 129 (since it's now
the master) while Web switch 2's priority will drop by 5 more to 114.
As you can see from this example, the user's goals were met by the configured tracking param-
eters.
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There is no shortcut to setting tracking parameters. The goals must first be set and the
OTE
outcomes of various configurations and scenarios analyzed to find settings that meet the goals.
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