GE Reason Switches
Chapter 7
– Configuration
162
REASON SWITCHES-TM-EN-3
7
Spanning Tree Settings
Spanning Tree menu allows configuring the usage of Spanning Tree Protocols (STP,
RSTP and MSTP) defined at the IEEE 802.1 D standards. This function is used to solve
loops created in a given LAN. Some topologies that are loop-based are the Ring and
Meshed topologies. When a loop is detected by the STP protocol, it defines the best
path to flow traffic and disable other paths, maintaining them as alternate paths to
automatically be available for use if one of the main paths crashes. Information of
bridges is exchanged in the BPDU (Bridge Protocol Data Unit) message, which
contains information of path costs and bridge and port priority to be used in the
definition of the logical topology.
This section does not explain STP protocol mechanisms and usage. For more information about Spanning Tree Protocols, refer
to the Spanning Tree Protocol section at the Functions chapter of the manual.
Spanning Tree menu is located at Settings
Spanning Tree in the Web Interface.
Bridge Settings:
The Bridge Settings menu allows configuring basic topics of the STP usage. It is
divided in Basic and Advanced Settings tables. Possible configurations are as follows.
o
Basic Settings:
Protocol Version
: select the Spanning Tree protocol to be
used. Possible values are STP, RSTP and MSTP protocols.
Protocol set in this field will be the protocol used in this
switch to solve loops in a given LAN. If lower protocol is
the only available at the network, the switch will use lower
protocol instead of the configured in this field. The MSTP
protocol is the highest level protocol, RSTP is the
intermediate and STP is the lowest level protocol. By
default the MSTP protocol is selected;
Bridge Priority
: indicates bridge priority to be used in the
root bridge election. Only one bridge is the root bridge in
the spanning tree protocols, and all nodes will be
connected to the root bridge. Lower numbers of bridge
priority mean higher priority bridge, that is, more reliable
bridge to be the root of the spanning tree hierarchy.
Lower value available is 0 and maximum value available
is 61,440;
Forward Delay
: indicates the delay that will be used in
STP bridges to change its blocking state to forwarding
state. This delay is only used when STP protocol is being
used. Allowed values are integer numbers from 6 to 40
seconds, and the Max Age field depends on this value to
be defined;
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