Management and Configuration Guide K/KA/KB.15.15

Example 134 Example of output showing status of nonstop forwarding for OSPFv3
(HP_Switch_name#) show ipv6 ospf3 general
OSPFv3 General Status
OSPFv3 protocol :enabled
Router ID :10.10.10.80
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Nonstop forwarding : Enabled
Graceful Restart Interval : 500
Graceful Restart Helper Mode : Enabled
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Hotswapping management modules
Management module switchover
Events that cause a switchover
There are a number of events that can cause the active management module to switchover to the
standby management module when management module redundancy is enabled:
• The active management module crashes
• The standby management module does not receive a heartbeat from the active management
module
• The redundancy switchover command is executed
• The MM Reset button on the active management module is pressed
• The MM Shutdown button on the active management module is pressed
• The boot or boot active command is executed
• The reload command is executed
• There is a hardware failure on the active management module
In all of these cases, the standby management module takes control and performs the actual
switchover. The reason for the switchover is entered in log messages on the newly active
management module and to any configured Syslog servers.
What happens when switchover occurs
When a switchover occurs, the features that support nonstop switching continue to operate in an
uninterrupted manner. See “Nonstop switching features” (page 498) for a list of the supported
features.
The features that do not support nonstop switching perform as if the switch had just finished booting;
however, no actual boot time occurs.
NOTE: When meshing configuration changes are made on a redundant management system,
you must execute write mem and then the boot system command to boot both management
modules for the changes to be activated.
Meshing is not supported by nonstop switching.
NOTE: If the switch is a querier and a failover occurs, the querier continues to be the same on
the standby management module; no new querier election process occurs on the standby
management module.
486 Chassis Redundancy (8200zl Switches)