Matrix DFE Series and N-SA User’s Guide 5-1
5
Configuring Spanning Trees
ThischapterprovidesthefollowinginformationaboutconfiguringandmonitoringSpanningTree
protocolsontheMatrixDFESeriesand N‐SAdevice:
Overview of Spanning Tree Protocols
MatrixDFESeriesandN‐SAdevicessupporttheSpanningTreeProtocol(STP),RapidSpanning
TreeProtocol(RSTP),andMultipleSpanningTreeProtocol(MSTP)asdefinedinthefollowing
standards:
• IEEE802.1D(SpanningTreeProtocol)
• IEEE802.1w(RapidSpanningTreeProtocol)
• IEEE802.1s(MultipleSpanningTreeProtocol)
Spanning Tree Terms and Definitions
Table 5‐1liststermsanddefinitionsusedinspanningtreeconfiguration.
For information about... Refer to page...
Overview of Spanning Tree Protocols 5-1
Configuring STP and RSTP 5-8
Configuring MSTP 5-14
Configuring Spanguard 5-16
Note: MSTP and RSTP are fully compatible and interoperable with each other and with legacy STP
802.1D.
Table 5-1 Spanning Tree Terms and Definitions
Term Definition
Alternate port Acts as an MSTP alternate path to the root bridge than that provided by the root port.
Backup port Acts as an MSTP backup for the path provided by a designated port toward the
leaves of the spanning tree. Backup ports can exist only where two ports are
connected together in a loopback mode or bridge with two or more connections to a
shared LAN segment.
BID Bridge identification, which is derived from the bridge’s MAC address and bridge
priority. The bridge with the lowest BID becomes the root bridge.
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