Huawei OptiX OSN 7500 - Figure 6-16 Wrapping Protection

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OptiX OSN 7500

Technical Manual - System Description 6 Data Features

Huawei Technologies Proprietary

6-18

Node 1

Node 2

Node 5

Node 6

Dual-ring

2.5 Gbit/s RPR

Node 4

Node 3

Fiber cut

Traffic flow

Figure 6-16 Wrapping protection

2. Steering

For steering protection, a station shall not wrap a failed segment when a failure is

detected. Instead, the source node will send traffic to the destination through a route

avoiding the failed link. The protection switching time is less than 50ms. The steering

protection does not waste bandwidth, however, it needs longer switching time and

some data before setting up a route may be lost. Figure 6-17 illustrates an example of

steering protection. Node 4 sends traffic to node 1 on the outer ring through nodes 3

and 2. If there is a fiber cut between node 2 and node 3, the topology discovery

function can help the traffic be transferred to node 1 over the inner ring through nodes

5 and 6.

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