ON-LINE CONFIGURATION
OPERATION
A - 8
I-E96-211A
®
Primary
Backup
n+1
n
01xx0x0x 11xx1x0x
{
5
z
5
2. When the shutdown request is received from the backup
MFC (Step 8 of the backup cycle), the primary MFC stops exe-
cuting and removes the bus clock.
Primary
Backup
n+1
n
01xx0x0x 01xx1x0x
{
5
z
5
3. The primary MFC is now acting as the hot backup. All the
old configuration and block output information remains intact
from when it is shut down in Step 2. If the new configuration is
not operating as expected, the primary MFC, currently acting
as the hot backup, can take control using the old configuration
and block output information (returns to Step 1).
Primary
Backup
n+1
n
00xx0x0x 00xx1x0x
{
5
{
5
4. Stopping and resetting the primary MFC, currently acting
as the hot backup, tells it to get a copy of the new configuration
(Step 9 of the backup cycle).
Primary
Backup
n+1
n
10xx0x0x 00xx0x0x
z
z
{
z
5. When the new configuration has been copied, the backup
MFC has completed its cycle, and is now serving as the pri-
mary MFC.
Primary
Backup
n+1
n
10xx0x0x 00xx0x0x
{
z
z
z
6. After the checkpoint data is complete, the primary MFC is
now serving as the backup MFC and is ready to take over the
control process. The primary cycle is complete. (This repre-
sents the same juncture as Step 11 of the backup cycle).
