Addendum

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High Availability (HA)
High availability (HA) in the Dell Networking operating software (FTOS) is configuration synchronization to
minimize recovery time in the event of a route processor module (RPM) failure. The feature is available on
the
S4810 S4820T platform.
In general, a protocol is defined as “hitless” in the context of an RPM failure/failover and not failures of a
line card, SFM, or power module. A protocol is defined as hitless if an RPM failover has no impact on the
protocol.
You must specifically enable some protocols for HA. Some protocols are only hitless if related protocols
are also enabled as hitless (for example, the redundancy protocol command).
redundancy force-failover
Force the secondary stack unit to become the primary stack unit. You can also use this command to
upgrade the software on one stack unit from the other when the other has been loaded with the
upgraded software.
Z9000 S4810 S4820T
Syntax
redundancy force-failover {stack-unit unit-number}
Parameters
stack-unit unit-
number
Enter the keyword stack-unit then the stack-unit ID
number. The range is from 0 to 7.
Default Not configured.
Command
Modes
EXEC Privilege
Command
History
This guide is platform-specific. For command information about other platforms,
refer to the relevant FTOS Command Line Reference Guide.
The following is a list of the FTOS version history for this command.
Version 9.2(0.0) Introduced on the M I/O Aggregator. This command is
supported in Programmable-Mux (PMUX) mode only.
Version
8.3.19.0
Introduced on the S4820T.
Version
8.3.12.0
Introduced on the S4810.
Version 8.1.1.0 Introduced on the E-Series ExaScale.
Version 7.5.1.0 Introduced on the C-Series.
High Availability (HA)
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