Because an AMM failure results in a configuration loss,
it is best practice to install a standby AMM when using BOFM.
The
BOFM configuration
is not included in the AMM configuration backup. Such a backup would
allow
BOFM configuration
updates from a file that might be outdated. This would cause inconsistencies
with the configuration of other chassis.
The
BOFM configuration
is chassis-based and does not transfer with the physical AMM. When
an AMM is moved to a new chassis, it clears out its
BOFM configuration,
and the
BOFM configuration
must be reapplied on the new AMM.
Note: When an AMM is moved to a
new chassis, it clears the configuration for all slots except for
slots that have blades powered-on with a valid BOFM configuration
that is already in use. For these slots, the AMM uses the BOFM configuration
as defined on the blades.
If the AMM configuration is
reset to factory defaults, the BOFM configuration
is handled as if a new AMM was installed in the chassis.
If
the primary AMM fails, the standby AMM contains the BOFM configuration
and takes over. As an additional precaution, you should always save
your BOFM configuration
file or files via the BOFM interface
whenever changes are made or a new configuration is applied.
If
you only have one AMM installed in the chassis and you must replace
it, before you replace it, insert the new AMM as a standby unit, let
it power on and wait for a few minutes. This allows the
BOFM configuration
to be transferred to the new unit. You can remove the old unit and
you do not have to reapply the
BOFM configuration.
Note: You
might have to wait longer than a few minutes, if the AMM you insert
in the standby slot does not have the same firmware level as the primary.