Basic Principles and Planning NE IDs of Planning the DCN

When constructing the DCN, select proper communication protocols according to the actual
networking situation, and follow the planning principles.
The principles for planning the DCN are as follows:

• When Huawei OptiX OSN 2500 constructs a network with other Huawei equipment, the HWECC or IP over DCC protocol is recommended. Use the same communication protocol in the entire DCN network.
• When the OptiX OSN 2500 constructs a hybrid network with equipment from other vendors, use the IP over DCC or OSI over DCC protocol according to the protocol supported by the equipment from other vendors.
• The OptiX OSN 2500 constructs a hybrid network with equipment from other vendors. In this case, if the equipment from other vendors do not support the IP over DCC or OSI over DCC, use the DCC bytes or the Ethernet service channels to transparently transmit the management information.
• When a communication protocol is used to construct the DCN network, properly set the DCN network scale and divide the network according to the network situation. Thus, the effect of large network scale on the DCN network can be reduced.
• The DCN network should be of the ring type to ensure the reliability of the network communication. Thus, route protection can be provided when fiber cuts or NE abnormalities occur. If fibers of the equipment cannot form a ring, extra DCN channels should be constructed to form a ring, and thus the route protection function can be realized.

NE IDs are used to identify Huawei transmission equipment. Thus, the NE IDs should be

configured when the DCN network uses the HWECC, IP over DCC, and OSI over DCC

protocols.

The principles for planning the NE IDs are as follows:

• The ID of each NE should be unique.
• In the same DCN network, the ID of each NE should be unique.
• An NE ID is 24 bits in binary, which can be divided into the former eight bits and the latter 16 bits.

– The former eight bits indicate the extended ID (the default value is 9), also called the subnet number, which identifies different subnets. The subnet number cannot be 0 or 0xFF (255 in decimal).

– The latter 16 bits indicate the basic ID. The value of the basic ID cannot be 0 or 0xBFF0(49136 in decimal), or be greater than 0xBFF0.

In the ring network, the NE IDs should be increased one by one in the same direction along

the ring network.

A complex network should be divided into rings and chains. First set IDs for NEs on the

ring from 1 to N, and then set the IDs for NEs on the chain as N+1, N+2,…