H3C Technologies H3C S7500E Series Switches - Manual (Page 16)

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Active and Standby Switchover Configuration
An S7500E Ethernet switch supporting intelligent resilient framework (IRF) can operate in two
modes: standalone mode and IRF mode.
z When the device works in standalone mode, it operates as a distributed device and you can
use all the features and functions in this manual to restart the standby main board (SMB) to
perform an active and standby switchover, thus to implement redundant backup between
the active main board (AMB) and the SMB;
z When the device works in IRF mode, it operates as a distributed IRF member device and
you can only use the display switchover state command to view the backup state of the
main boards, and other functions and commands do not take effect.
z For introduction to IRF, refer to IRF Configuration Guide.
This chapter includes these sections:
z Introduction to Active and Standby Switchover
z Active and Standby Switchover Configuration Task List
z Ignoring Version Check of the SMB
z Restarting the SMB
z Manually Performing an Active and Standby Switchover
z Displaying and Maintaining Active and Standby Switchover
Introduction to Active and Standby Switchover
If a device has two main boards, the main board that forwards and processes packets is called
the active main board (AMB), and the main board that is in the standby state is called the
standby main board (SMB). The system uses the main board with a smaller slot number as the
AMB, and the other main board as the SMB. The SMB keeps its configuration the same as the
AMB through the synchronization function. When the AMB fails, the SMB becomes the AMB to
process services to ensure the normal operation of the device. This switchover process is
called an active and standby switchover.
Active and standby switchover functions in the following two ways:
z Automatic active and standby switchover. If the AMB fails or is plugged out, the system
automatically performs an active and standby switchover to enable the SMB to function as
the AMB.
z Manual active and standby switchover, that is, an active and standby switchover performed
at the command line interface.