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
X
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.
