Hello, everyone.
In this post, I would like to share with you about BPS.
BPS requires an active board and a standby board, to provide 1+1 and non-revertive active/standby protection to the equipment. During normal operation, the configuration information of the active board is the same as the configuration information of the standby board.
Switching Condition
The BPS occurs when any of the following conditions are met:
•The port on the working board is faulty.
•A hardware fault occurs.
•The working board is offline.
Switching Process
The process of BPS switching in 1000M full-duplex mode is as follows:
1. The working board periodically checks the board hardware and its physical ports. When detecting a hardware fault or port LINK-DOWN, the working board notifies the cross-connect board immediately.
2. After receiving the fault notification from the working board, the cross-connect board checks whether the protection board is normal. If the protection board is normal, the cross-connect board issues the active/standby switching command immediately.
3. After receiving the switching command, the laser on the working board is disabled quickly. At the same time, the laser on the protection board is enabled.
4. After the laser on the working board is disabled, the working board at the opposite end is LINK-DOWN. After the laser on the protection board is enabled, the protection board at the opposite end is LINK-UP.
5. The working path is switched to the working or protection board according to the status of the working and protection boards. In this manner, the BPS switching is implemented.
The process of BPS switching in Auto mode is as follows:
1. The working board periodically checks the board hardware and its physical ports. When detecting a hardware fault or port LINK-DOWN, the working board notifies the cross-connect board immediately.
2. After receiving the fault notification from the working board, the cross-connect board checks whether the protection board is normal. If the protection board is normal, the cross-connect board issues the active/standby switching command immediately.
3. After receiving the switching command, the protection board sets its port working mode to Auto. The peer protection board changes to the LINK_UP state. The laser on the working board is disabled.
4. After the laser on the working board is disabled, the peer working board changes to the LINK_DOWN state.
5. After a period of time, the laser on the working board is enabled, and the port working mode is changed to 1000M full-duplex. The working path is switched to the working or protection board according to the status of the working and protection boards. In this manner, the BPS switching is implemented.
That's all, I hope you like it.
Thank you!
