User's Manual

Table Of Contents
288
Users Manual of CS-6306R
Figure 8. Check the channel status on the major ring between the edge node and the assistant node.
2. The edge node blocks the edge port at the interruption of the channel.
If the assistant node cannot receive the edge-hello packet during Edge Fail Time, the assistant holds that the
channel of the sub-ring protocol packetthe edge-hello packetis interrupted, changes its edge port’s status
into the Edge-Preforwarding status instantly, blocks the forwarding of the data packets (though still receives
and forwards the control packet), and immediately transmits the LINK-DOWN packet to the master node for
the master node to open the secondary port to avoid communication interruption among all nodes on the ring.
Remarks:
In order to guarantee that the edge port first changes into the edge-preforwarding status and then the master
node opens the secondary port, you shall be sure that the cycle for the edge node to transmit the edge-hello
packet, Edge Hello Time, is smaller than the cycle for the master node to transmit the Hello packet, Hello
Time; similarly, the Edge Fail Time of the assistant node should be smaller than Fail Time. At the same time,
Fail Time is generally the triple of Hello Time, and Edge Fail Time is also the triple of Edge Hello Time.