Hello everyone!
This post will share with you about the master-slave subrack of the OTN.
Why should we use the master-slave subrack mode on an OTN network?
When multiple subracks need to be configured on an NE, the master-slave subrack mode can be used to manage these subracks in a unified manner. The master-slave subrack mode saves IP resources and displays multiple subracks as one NE on the NMS. This facilitates maintenance and reduces management costs. In master-slave subrack mode, multiple subracks are displayed as one NE on the NMS.
In the master-slave subrack mode, only the master subrack can be connected to the NMS. The NE housing the master subrack connected to the NMS is a gateway NE.
Comparison Between the Master-Slave Subrack Mode and the Traditional Hub Mode
Comparison on multi-subrack configuration:
In the hub mode, multiple subracks are displayed as multiple NEs on the NMS, and each NE is assigned with an NE ID and an IP address.
In the master-slave subrack mode, multiple subracks are displayed as one NE on the NMS, and only the master subrack is assigned with an NE ID and an IP address.
An NE cannot be smoothly upgraded from the hub mode to the master-slave subrack mode.
Master-Slave Subrack Network
The master-slave subrack mode is applicable to tree networks, ring networks, and chain networks.
Mode differences in a tree network, a ring network, and a chain network：
Cascading in a Tree Network
In the tree-network cascading mode, master and slave subracks do not provide protection functions. This mode is mainly used to manage multiple subracks in a unified manner.
Tree networking：
Cascading in a Ring Network
Protection for inter-subrack communication can be implemented only in the ring network. When subracks are cascaded in a ring network, the master subrack and slave subracks collaborate to protect communication between them. To provide protection, the slave subracks are mainly responsible for fault detection and switching request processing; in addition to the functions of slave subracks, the master subrack is also responsible for ring detection, ring release (restoration from a fault), and switching.
Ring networking：
Chain networking：
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