HP FlexFabric 7900 Series Command Reference Manual page 280

Usage guidelines
You can use this command to return to the default MDC only after you use the switchto command to
log in to a non-default MDC. If you log in to a non-default MDC by using any other method (such as
Telnet), you cannot use this command to access the default MDC.
Examples
# Return from the current MDC to the default MDC.
<sub1> switchback
[Sysname]
Related commands
switchto mdc
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