User`s guide

Configuring STP and RSTP
5-8 Configuring Spanning Trees
Configuring STP and RSTP
ThissectionprovidesinformationaboutthefollowingSTPandRSTPtasks:
• ReviewingandRe‐enablingSpanningTree
• AdjustingSpanningTreeParameters
• EnablingtheBackupRootFunction
• AdjustingRSTPParameters
Reviewing and Re-enabling Spanning Tree
Bydefault,spanningtreeisenabledgloballyontheMatrixDFESeriesorN‐SAdeviceand
enabledonallports.ThedefaultversionissettoMSTP(802.1s)mode.SinceMSTPmodeisfully
compatibleandinteroperablewithlegacySTP802.1DandRSTPbridges,inmostnetworks,this
defaultshould
notbechanged.
Usethefollowingcommandstoreview,re‐enableandresetthespanningtreemode.
1. ReviewthecurrentconfigurationononeormoreSIDsand/orports:
show spantree stats [port port-string][sid sid][active]
Specifyingactivewilldisplayinformationforport(s)thathavereceivedBPDUssinceboot.
Example
Thisexampleshowshowtodisplaythedevice’sspanningtreeconfiguration:
2. Ifnecessary,globallyenablespanningtree:
set spantree stpmode iee8021
Caution: Spanning Tree configuration should be performed only by personnel who are very
knowledgeable about Spanning Trees and the configuration of the Spanning Tree Algorithms.
Otherwise, the proper operation of the network could be at risk.
Matrix->show spantree stats
SID - 1
Spanning tree mode - enabled
Designated Root - 00-e0-63-6c-9b-6d
Designated Root Priority - 0
Designated Root Cost - 1
Designated Root Port - ge.5.1
Root Max Age - 20 sec
Root Hello Time - 2 sec
Root Forward Delay - 15 sec
Bridge ID MAC Address - 00-e0-63-9d-b5-87
Bridge priority - 32768
Bridge Max Age - 20 sec
Bridge Hello Time - 2 sec
Bridge Forward Delay - 15 sec
Topology Change Count - 6539
Time Since Top Change - 00 days 00:00:00