Protection; Figure 6-15 Evplan Service - Huawei OptiX OSN 7500 Technical Manual

OptiX OSN 7500
Technical Manual - System Description

Figure 6-15 EVPLAN service

6.2.3 Protection

The RPR service of the OptiX OSN equipment takes the protection of several levels,
including:
1.
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.
Port 1
B1
2.5 Gbit/s RPR
Port 1
Node 2
Port 2
B2
Wrapping and Steering
Spanning tree and LCAS
Protection of optical transmission layer, such as MSP and SNCP
Wrapping
Huawei Technologies Proprietary
A1 A2
MAC forwarding table of node 1
Port 2
Node 1
Dual-ring
Node 4
MAC forwarding table of node 2
Node 3
Port 1
C1
6-17
MAC Port VMAN
A1 port 1 none
A2 port 2 none
B1 rpr1 100
B2 rpr1 100
C1 rpr1 100
MAC Port VMAN
A1 rpr1 100
A2 rpr1 100
B1 port 1 none
B2 port 2 none
C1 rpr1 100
6 Data Features