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Spanning Tree Algorithms (STA)
FX-DS110-APL
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6. Spanning Tree Algorithms (STA)
This chapter describes spanning tree algorithms (STA's) supported
by this product.
by this product.
What is an STA?
Communication between nodes on two bridged LAN segments
must take place on one path. If two or more paths exist, packets
may get caught in the loop and the network, unable to eliminate the
packets, may crash. If the network can be configured in such a
way as to eliminate the possibility of network loops this problem
cannot occur, but if spare paths are provided and used, it is
necessary to switch routes manually. The problem can be avoided
if the bridge has the following functions.
must take place on one path. If two or more paths exist, packets
may get caught in the loop and the network, unable to eliminate the
packets, may crash. If the network can be configured in such a
way as to eliminate the possibility of network loops this problem
cannot occur, but if spare paths are provided and used, it is
necessary to switch routes manually. The problem can be avoided
if the bridge has the following functions.
Network Loop Detection and Avoidance
This function detects path that are involved in network loops and
keeps only one path active. The other path is kept available for
backup but cannot be used.
keeps only one path active. The other path is kept available for
backup but cannot be used.
Automatic Topology Reconfiguration
This function reconfigures the network topology when a fault
occurs on a backup route.
occurs on a backup route.
This method of resolving problems is called an STA, and has been
standardized by the spanning tree protocol (STP) established in
IEEE 802.1D. STP can enhance network reliability.
standardized by the spanning tree protocol (STP) established in
IEEE 802.1D. STP can enhance network reliability.
Note!
For STA's to function properly, all bridges in a network must
support STP.
support STP.