ON-LINE CONFIGURATION
OPERATION
B - 4
WBPEEUI230019A0
®
Primary Cycle
Refer to Table
for the primary cycle procedure. The step
numbers in this cycle correspond to the states of Figure
n
01xx0x0x
n+1
10xx1x0x
5. When the checkpoint data for the old configuration is received from the pri-
mary MFP module, the reconfigured backup MFP module can assume the role
of the primary MFP module if a failure is detected in the old configuration (refer
to Step 9). However, the primary MFP module still indicates that no backup is
available when the configuration is different.
Additional configuration changes can be made by once again entering configure
mode (Step 2). If no changes have been made, a backup MFP module reset
returns the backup module to the state of Step 1. If changes have been made,
the backup module must be put into configure mode and initialized to get to the
state of Step 1.
n
01xx0x0x
n+1
00xx1x0x
6. After the changes have been made, switch process control to the reconfigured
backup MFP module by pressing and releasing the backup MFP module stop/
release button two times. The first time stops the module and the second time
resets the module. The backup MFP module comes up in execute mode with the
configuration marked as valid.
n
01xx0x0x
n+1
10xx1x0x
7. Note that backup cycle step transitions from 6 to 7 to 8 to 9 occur automati-
cally after the Step 6 backup MFP module reset. The time it takes to complete
these transitions is MFP module configuration dependent. The status indicated
in Steps 6, 7, and 8 might not be seen depending on the actual step transition
times. The important status to wait for is indicated by Step 9.
After the checkpoint data is updated, the backup MFP module is ready to take
over the duties of the primary MFP module.
n
01xx0x0x
n+1
11xx1x0x
8. The backup MFP module requests the primary MFP module to shut down and
assume the role of a hot backup (n+1). The backup MFP module waits to act as
the primary MFP module (n). (A hot backup is a backup which retains the old
configuration and control data and is ready to assume control if an error is
detected in the new configuration.)
n+1
01xx0x0x
n
01xx1x0x
9. The primary MFP module has removed the bus clock (BUSCLK) and acts as a
hot backup (n+1). The reconfigured backup MFP module is now serving as the
primary MFP module (n).
Before proceeding to the following commands, insure that LED and module sta-
tus are as shown in this step.
To return to Step 5, reset the backup MFP module (n). This allows correcting a
bad configuration.
The backup MFP module (n+1) must be reset at this point in order for the on-line
configuration cycle to complete. Resetting the backup MFP module (n+1), cur-
rently acting as the hot backup, tells it to get a copy of the new configuration.
n+1
10xx0x0x
n
00xx0x0x
10. After the backup MFP module copies the new configuration into the primary
MFP module, the cycle is complete. The backup MFP module is now serving as
the primary MFP module (n) while the primary handles the backup role (n+1).
(Note that the LED combination and module status is the opposite of Step 1 indi-
cating the role reversal.)
Table B-2. Backup Cycle
(continued)
Primary
Backup
Procedure
