OptiX OSN 7500
Technical Manual - System Description 6 Data Features
Huawei Technologies Proprietary
6-17
Node 1
Node 3
Dual-ring
2.5 Gbit/s RPR
Node 2 Node 4
MAC VMANPort
A1 none
A2 noneport 2
B1 100rpr1
Port 1
B2 100rpr1
C1 100rpr1
Port 2
Port 1
Port 2
Port 1
A1 A2
B1
B2
C1
port 1
MAC forwarding table of node 1
MAC VMANPort
A1 100
A2 100rpr1
B1 noneport 1
B2 noneport 2
C1 100rpr1
rpr1
MAC forwarding table of node 2
Figure 6-15 EVPLAN service
6.2.3 Protection
The RPR service of the OptiX OSN equipment takes the protection of several levels,
including:
Wrapping and Steering
Spanning tree and LCAS
Protection of optical transmission layer, such as MSP and SNCP
1. Wrapping
If an equipment or facility failure is detected, the traffic is wrapped back to the opposite
direction at the stations adjacent to the failure, connecting the outer ring with the inner
ring. The protection switching time is less than 50ms. Though featuring fast protection
switching, wrapping protection wastes bandwidth. As illustrated in Figure 6-16, traffic
is transferred from node 4 to node 1 through nodes 3 and 2. If there is a fiber cut
between node 2 and node 3, they will wrap the traffic and connect the two rings
together for protection.
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