User's Manual

Table Of Contents
272
Users Manual of CS-6306R
26.1.4.2 Notification of Invalid Link of Transit Node
After the transit port of the transit node is out of effect, the LINK-DOWN packet will be immediately transmitted
by the other transit port to notify other nodes. In normal case, the packet passes through other transit nodes
and finally arrives at one port of the master node.
After the master node receives the LINK-DOWN packet, it thinks that the ring network is invalid. In this case,
the master node removes the blocking of data VLANs on its secondary port, ages the local MAC address
table, transmits the RING-DOWN-FLUSH-FDB packet and notifies other nodes.
26.1.4.3 Resuming the Link of the Transit Node
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 to the master node is already out of effect, the transit node will automatically set the pre-forwarding
port to be a forwarding one.
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.
Fast Ethernet Ring Protection Configuration 26.2
26.2.1 Default EAPS Settings
The fast Ethernet protection protocol cannot be set together with STP.
After STP is disabled, you are recommended to run spanning-tree bpdu-terminal to keep the ring node from
forwarding BPDU, which leads to the storm.
See the following table:
Table 2.1 Default settings of the Ethernet ring protection protocol and STP.
Spanning tree protocol
spanning-tree mode rstp
Fast Ethernet Ring Protection There is no configuration.