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Ethernet Hot Standby Solution
840 USE 106 00 January 2003 169
NOE Operating Modes and Hot Standby
The NOE Modes The NOE modes are
Primary Mode
The Hot Standby state is primary, and all services are active.
Secondary Mode
The Hot Standby state is standby, and all server services are except DHCP.
Standalone Mode
Occurs when NOE is in a non redundant system, or if the CHS module is not
present or is not healthy.
Offline Mode
CPU is stopped.
CHS module is in Offline mode.
The Hot Standby and the NOE operating mode are synchronized by the conditions
described in the following table.
Any one of four events will affect the NOE operating mode. These four events occur
when the NOE is powered-up, when an NOE executes a Hot Standby switchover,
when an NOE goes to offline mode, or when a new application is downloaded to the
NOE.
CHS Module Status HSBY State NOE Operating Mode
Present and Healthy Primary Primary
Present and Healthy Standby Secondary
Present and Healthy Offline Offline
Present and Healthy Unassigned Standalone
Not present or unhealthy N/A Standalone