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Cisco ONS 15530 Configuration Guide and Command Reference
78-14227-01, Cisco IOS Release 12.1(10)EV2
Chapter3 Initial Configuration
About CPU Switch Module Redundancy
During normal operation, the active CPU switch module boots completely. The standby CPU switc h
module partially boots, stopping short of parsing the configuration . From t his po int, t h e ac tive and
standby CPU switch modules communicate periodically to synchronize any syste m c onfigurati on
changes.
Table 3 -1 describes the five CPU switch module hardware states.
Table3-1 CPU Switch Module Hardware States
State Description
Active Processor card is currently providing clock signals and control for all system
cards. The active CPU switch module responds to the configured
management IP address.
Standby Processor card is partially booted in hot-standby state waiting to switch over
when the active CPU switch module fails, when it is rebooted or removed, or
when a manual switchover is requested.
Nonparticipant Processor card is in ROMMON mode, or is in the process of booting, or has
not yet reached the hot-standby state. Manual s witchov ers are reje cted unless
the force option is used.
Not plugged in Processor card slot is empty.
Error Processor card is present but either the interprocess arbitration interface is
not functioning or the CPU switch module is not fully seated in the chassis
slot.