You can replace the AMM in a single AMM environment.
When you replace an AMM and you don't have a standby
AMM in the chassis, the
BOFM configuration
is cleared. If the current AMM is functioning, the best approach is
to insert the new AMM in the second slot as a standby AMM for a few
minutes. This allows the primary AMM to synchronize the
BOFM configuration
with the standby AMM before the primary AMM is removed. If this is
not possible, you can reapply the
BOFM configuration
after inserting the new AMM. By default, the AMM clears its
BOFM configuration
when inserted into a new chassis. However, if any of the blades are
already powered on when the AMM is inserted into a new chassis, the
AMM takes the
BOFM configuration
from those blades.
If the AMM was reinserted into the same chassis
it was previously in, it continues to use the BOFM configuration
that is defined on the AMM. During the period that the AMM was not
in the chassis, the BOFM configuration
might have changed. In this case, inconsistencies and address duplications
can occur.
If the AMM configuration is reset to factory defaults,
then the BOFM configuration
is cleared the same way as if a new AMM is inserted into a chassis.
Also, the BOFM configuration
is not included in the AMM configuration file, so when restoring the
AMM configuration from a file, the BOFM configuration does not change.
Note: You might have to wait longer if the AMM you insert
in the standby slot does not have the same firmware level as the primary.
In that case, the standby AMM is flashed first and then the data is
synchronized.