Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 556)

526 Multi-Service IronWare Switching Configuration Guide
53-1003036-02
Forced switch
15
Next, the operator enters the no command to clear the forced switch. For this example, the
operator initiated the forced switch from ERN 4 and must clear it from ERN 4.
Figure 142 shows the
forced switch recovery process in sequential order.
FIGURE 142 FS clear process
RPL owner (ERN1) Non-RPL node (ERN 2) Non-RPL node (ERN 3) Non-RPL node (ERN 4)
From the FS state, ERN 4:
1
Starts the guard timer
2 Stops transmitting
R-APS(FS
3 Transmits R-APS(NR)
4 Keeps blocking the
port
5 Enters Pending state
From FS state, ERN 1:
1
Forwards R-APS
2 Starts the guard timer
3 Starts the WTB timer
4 Enters Pending state
From FS state, ERN 2:
1
Forwards R-APS
2 Starts the guard timer
3 Enters the Pending
state
From FS state, ERN 3:
1
Forwards R-APS
2 Starts the guard timer
3 Enters the Pending
state
After the WTB timer expires,
from the Pending state ERN
1:
5. Blocks the RPL port
6. Transmits R-APS(NR,RB)
7. Unblocks the non-RPL port
8. Flushes the FDB
9. Enters the Idle state
From the Pending state,
ERN 2:
4. Flushes the FDB
5. Forwards R-APS(NR,RB)
6. Enters the Idle state From the Pending state,
ERN 3:
4. Stops transmitting
R-APS
5. Unblocks ports
6. Flushes the FDB
7. Forwards R-APS(NR,RB)
Enters the idle state From the Pending state,
ERN 4:
6. Stops transmitting
R-APS
7. Unblocks ports
8. Flushes the FDB
9. Forwards R-APS(NR,RB)
10. Enters the Idle state
From the idle state, ERN 1:
10. Receives its own
R-APS(NR,RB)
11. Stops transmitting R-APS
12. Remains in the Idle state