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S2989G-24TX Operation Manual

Chapter 7 Reliability Configuration

7-36

network port to notify other nodes that RPL link has been blocked. At the same

time, the node G run the flush FDB;

g) When the node C received the R-APS (NR, RB) packets sent by RPL owner

node, it will relieve the block of the local port and stop sending NR packets at the

same time. After RPL neighbor node A received this packet, it will block the port

connected to RPL. Other, all nodes will run the flush FDB after received R-APS

(NR, RB) packets.

2. Non-revertive switch

The following example is about the single-ring and single link fault as shown in Fig 7-

17.

Figure 7-17 Non-revertive switch fault restoration of single link

The steps:

a) The fault still existed, the node which has detected the fault will send the R-APS

(SF) packets with the fault message periodically;

b) Fault restoration on the link;

c) The nodes of C and D detects the fault restoration, they will start the guard timer

and send the fault restoration packets of R-APS (NR) on the ports of the ring

network at the same time;

d) When the RPL owner node G detected the R-APS (NR) packets, it will clear the

local node fault message because of the configured non-revertive method, but it

will not start the WTR timer;

e) After the nodes C and D are time out, they receives the R-APS (NR) packets

from the peer. The node D thinks the priority of node C is higher, so it will stop

sending the R-APS (NR) packets and relieve the block of the local port;

f) If RPL owner node G runs clear command, it will be recovered to be revertive

method and it will block the port connected to RPL and send R-APS (NR, RB)

packets through the ring network port to notify other nodes that the RPL link has

been blocked. At the same time, it will run flush FDB;