Cisco Systems 78-16019-02 manual State Description, CPU Switch Module State Transition Diagram

Chapter 3 Initial Configuration

About CPU Switch Module Redundancy

Table 3-1 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 switchovers are rejected 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.

Figure 3-1shows the valid hardware transition states for a system with redundant CPU switch modules.

Figure 3-1 CPU Switch Module State Transition Diagram

Nonparticipant

Active	Not plugged in	Standby
	(processor card
	removed)

Error

58645

In response to redundancy events, such as switchovers and reboots of the active CPU switch module, the software transitions through a series of software redundancy states. Table 3-2lists some of the significant software states.

	Cisco ONS 15530 Configuration Guide and Command Reference
78-16019-02, Cisco IOS Release 12.2(18)SV2		3-13