User Manual

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Users Manual of XGS-6350-24X4C
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.
26.2.2 Requisites before Configuration
Before configuring MEAPS, please read the following items carefully:
 One of important functions of the ring protection protocol is to stop the broadcast storm, so please make
sure that before the ring link is reconnected all ring nodes are configured.If the ring network is connected
in the case that the configuration is not finished, the broadcast storm may easily occur.
 EAPS is well compatible with STP, but the port under the control of EAPS is not subject to STP.
 The ring protection protocol supports a switch to configure multiple ring networks.
 Configuring ring control VLAN will lead to the automatic establishment of corresponding system VLAN.
 The port of each ring can forward the packets from the control VLAN of the ring, while other ports, even
in the Trunk mode, cannot forward the packets from the control VLAN.
 By default, Fail-time of the master node is triple longer than Hello-time, so that packet delay is avoided
from shocking the ring protection protocol. After Hello-time is modified, Fail-time need be modified
accordingly.
 By default, Pre-Forward-Time of the transit node is triple longer than Hello-time of the master node so
that it is ensured that the master node can detect the recovery of the ring network before the transit port
enters the pre-forwarding state. If Hello-time configured on the master node is longer than
Fre-Forward-Time of the transit node, loopback is easily generated and broadcast storm is then