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Configuring Shelf-Controller Redundancy (APX 8000)
Configuring the APX 8000 for shelf-controller redundancy
APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide Preliminary May 9, 2000 2-3
Controller switchover
If the primary controller fatals, the secondary controller automatically takes over as primary
controller. The new primary (old secondary) downs all slot cards and then brings the system
back up. All connections are dropped. After the primary shelf controller comes up, the slot
cards are reset. The system is now ready to take new calls. Each time a controller is selected as
the primary controller, an entry is made in the fatal-error history log.
A switchover, when control passes from the primary controller to the secondary, is initiated by
one of the following occurrences:
• The primary controller has a hardware or software problem that causes the module to
reset. The secondary is assigned to act as the primary.
• You enter the switchover command, Redundant-Controller-Switch at the
command line interface, which switches control from the primary to the secondary
controller.
APX 8000 slot cards communicate with the primary controller through the packet bus. The
primary controller is assigned virtual slot number 43, through which communication with the
slot cards occurs. If a switchover occurs, the new primary controller inherits virtual slot
number 43.
Log messages
Log messages are issued to notify you of significant events related to shelf controller
redundancy. For example, the following cases result in a log message:
• A shelf controller becomes primary.
• A fatal log entry is generated when a shelf controller has a software crash.
• A controller becomes primary when no secondary controller is present.
• The primary controller loses heartbeat communication with the secondary controller.
• The primary controller establishes heartbeat communication with the secondary controller.
Configuring the APX 8000 for shelf-controller
redundancy
Setting up the APX 8000 for shelf-controller redundancy includes the following tasks:
• Assigning the system IP address
• Assigning the shelf-controller Ethernet IP address
• Assigning the soft IP address
• Configuring shelf-controller redundancy
You can use the redundant-controller-switch command-line interface command to
switch primary controller functionality from one controller to the other. See “Switching the
primary controller at the command-line interface” on page 2-8 for instructions.