User Manual

267

Users Manual of XGS-6350-24X4C

Figure 12: Ring transmitting the trouble and notifying the master node

After the master node receives the link-down packet, its state will be changed to the Failed state and at the

same time the secondary port will be opened, the FDB table will be refreshed, and the

RING-DOWN-FLUSH-FDB packets will be transmitted from two ports for notifying all nodes. As shown in the

following figure, the master node on the major ring notifies the transit node on the major ring of refreshing

FDB; sub ring 1 has troubles on its channel, so the edge port of the assistant node will be blocked; the master

node of sub ring 2 notifies the transit nodes on the sub ring to refresh FDB and then the transparent

transmission will be conducted on the major ring.

Figure 13: Ring transmitting troubles and refreshing FDB

27.3.2.2 Recovery

When the port on the transit node is recovered, the transit node will shift to its Preforwarding state. The

processing procedure when the port of the transit node is recovered is shown in the following figure. The link

of the major ring will recover, while the transit node, which connects the link of the major ring, changes into the

Preforwarding state, blocks the data packets but allows the Hello packets of the control packet to pass

Master(Assistant)

Edge

Transit

Edge

Assistant

Master

Sub

Ring

P-Primary port

S-Secondary port

B-Block port

Major Ring

Transit

Master

Sub

Ring

Sub Ring II

LINK DOWN

Major Ring

LINK DOWN