User's Manual

Table Of Contents
285
Users Manual of CS-6306R
Figure 4: Link status change notification
After the transit port is resumed, it does not immediately transmit the packets of data VLANs, but enters the
Pre-Forwarding state. A transit port in pre-forwarding state only transmits and receives the control packets
from the control VLAN.
If there is only one transit port invalid in the ring network and when the port enters the pre-forwarding state,
the secondary port of the master node can receive the HEALTH packet from the primary port again. In this
case, the master node blocks data VLANs on the secondary port again and transmits the notification of
ageing address table outside. After the node with a transit port in pre-forwarding state receives the notification
of aging address table, the node will first modify the pre-forwarding port to the forwarding port and then ages
the local MAC address table.
If a transit mode does not receives the notification of aging address table from the master node, it thinks that
the link connecting the master node is already out of effect, and the transit node will automatically set the
pre-forwarding port to be a forwarding one.
Remarks:
You can configure the related commands through the pre-forward-time node to modify the time for the transit
port to keep the pre-forwarding state.
27.1.4.3 Channel Status Checkup Mechanism of the Sub-Ring Protocol Packet on the
Major ring
The ports on the major ring are simultaneously added to the control VLAN of the major ring and the control
VLAN of the sub ring. Hence, the protocol packets of the sub ring should be broadcast among the edge ports
of the edge node and the assistant node through the channel, provided by the major ring. In this case, the
whole major ring is just like a node of the sub ring (similar as a virtual transit node), as shown in the following
figure: