Brocade MLX Series and Brocade NetIron XMR Diagnostic Guide ...

Management module diagnostics 2Common diagnostic scenariosManagement module switchover eventsIn a redundant management module configuration, whenever the standby management moduleassumes the role of active module a switchover event has occurred. This happens when the activemodule becomes unavailable (for example, power is lost or a component fails), you perform amanual switchover, or you remove or replace the active management module. When a switchoveroccurs between the active and standby modules, management sessions, syslog, and SNMP trapsmay be affected.When an active module becomes unavailableThe following events will cause an active module to become unavailable and trigger a switchover:• An active module experiences a problem significant enough to cause a reset of the module. Ifthis is a software problem, capture the output from the show tech command. If the outputcontains a crash dump, contact Brocade Technical Support.• The active module loses power. This may happen if a power supply fails, or because of ageneral disruption in power.Before a switchover occurs, the active module resets itself and sends an interrupt signal to thestandby module. The standby module then becomes the active module, allowing the modules tocontinue forwarding traffic.The new active module also begins to manage the system. When the original active module againbecomes available or is replaced, the new active module resumes in the role of standby.Management module error messagesThe following messages are displayed in the event of a switchover event, if there is a problem withthe standby management module in a redundant configuration.Warning: Active MP running image is not in its flash or PCMCIA card, imagesynchronization is not possible:Warning: Standby Module is not allowed - put standby MP in reset.Switchover syslog and SNMP trapsWhen a switchover occurs, the system sends a syslog message to the local syslog buffer and to thesyslog server, if one is configured. The system also sends an SNMP trap to the receiver, if one isconfigured.If the system is reset as the result of a switchover to the standby management module, the systemsends a warm start message and trap.Monitoring management module redundancyYou can monitor the following aspects of management module redundancy:• The status of the management modules (if a module is the active or standby module).• The switchover history for the management modules.Brocade MLX Series and Brocade NetIron XMR Diagnostic Guide 2953-1002426-02