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Primary and Backup Compatibility
Only similar modules may share a protection chain. When a failover occurs, the backup module inherits the configuration of the primary module. To prevent loss of service because of feature conflicts, the backup's feature keys should be a superset of the primary's keys. This ensures that when the backup goes into service it can supply all required functionality.
When a module that has a companion module (i.e. audio/video expansion board) fails, both modules go offline. If the assigned backup module has a similar companion module, both modules will replace the functionality in the case of failure. This does not require special configuration.
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