User's Manual

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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.
41.7 Requisites Before Configuration
Before configuring MEAPS, please read the following items carefully:
(4) 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 such that the configuration is not finished, the broadcast storm
may easily occur.
(5) EAPS is well compatible with STP, but the port under the control of EAPS is not subject to
STP.
(6) The ring protection protocol supports a switch to configure multiple ring networks.
(7) Configuring ring control VLAN will lead to the automatic establishment of corresponding
system VLAN.
(8) 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.
(9) 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.
(10) 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 triggered.
(11) The physical interface, the fast-Ethernet interface, the gigabit-Ethernet interface and the
aggregation interface can all be set to be the ring's interfaces. If link aggregation, 802.1X or
port security has been already configured on a physical interface, the physical interface
cannot be set to be a ring’s interface anymore.
41.8 MEAPS Configuration Tasks
(12) Configuring the Master Node
(13) Configuring the Transit Node
(14) Configuring the Ring Port
(15) Browsing the State of the Ring Protection Protocol
41.9 Fast Ethernet Ring Protection Configuration
41.9.1 Configuring the Master Node
Configure a switch to be the master node of a ring network according to the following steps:
Command Purpose
Switch#
config
Enters the switch configuration mode.