SNR S2989G-48TX-RPS [433/553] Fault switchover

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S2989G-24TX Operation Manual

Chapter 7 Reliability Configuration

7-34

7.5.1.2.1 Fault Switchover

The following is the single-ring and single link fault.

Figure 7-15 single-link fault

The steps of fault switchover:

a) The ring network status is normal; RPL owner node of G sends the R-APS (NR,

RB) packet periodically. This packet explains that RPL link is in blockade status

and the ring network is healthy.

b) There is fault on the link between node C and D.

c) The node C and D detected the fault, they block the port which connected to the

fault link respectively and run the flush FDB.

d) At the same time, the node C and D send the fault notification packet of R-APS

(SF) respectively through the port connected to the ring network.

e) All the nodes which received R-APS (SF) packet will run the flush FDB. At the

same time, RPL owner node of G and RPL neighbor node of A will configure the

RPL connection port as forward. The node G will stop sending R-APS (NR,RB)

packet.

f) Because RPL link has removed the blockade, all nodes can receive two R-APS

(SF) packets (sent by node C and D). after receiving the new R-APS (SF) packet,

it will run the flush FDB.

g) Link fault message of R-APS (SF) will transmitting always in the ring network.

7.5.1.2.2 Failure Recovery

When the ring link restored, there are two methods on the ring nodes: one is

Revertive switch. After the ring link restored to be normal, the ring network will block the