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ATM Switch/Control Redundancy
By installing a second 6416SW in a 17-slot hub, a backup to the active 6416SW is
provided (check the Release Notes for the level of 6416SW and the level of code
required). If the active 6416SW fails, the standby will take over control. The active
6416SW continually updates the tables in the standby 6416SW to ensure that the
backup configuration is current, and to reduce the impact should a switch to the standby
be required. The active 6416SW checks every one second to determine if the standby
6416SW is present and up-to-date. The date and time are also updated to ensure
network time consistency in case of switch-over.
The active 6416SW also periodically requests that the standby 6416SW perform
diagnostics to ensure that it is capable of assuming control if required.
Which 6416SW is to be active can be defined by the operator in both Maintenance and
Administrator modes, via the SET ROLE or SET DEVICE ROLE command (see the
ONcore Switching Hub/CELLplex 4000 ATM Command Reference Guide
for details).
This choice is considered at next reset when electing the active 6416SW. Maintenance
mode can be entered for the backup 6416SW, but this mode will be ended should the
active 6416SW fail or enter Maintenance mode.
Note: The standby 6416SW does not support Telnet. There are two console modes
available, basic dialog mode and maintenance mode.
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