Specifications

Configuring STP and RSTP
March 14, 2011 Page 12 of 29
SinceMSTPmodeisfullycompatibleand interoperablewithlegacySTP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configurat ionononeormoreSIDs,ports,orboth:
show spantree stats [port port-string] [sid sid] [active]
Specifyingactivewilldisplayinformationforport(s)thathavereceivedBPDUssinceboot.
2. Ifnecessary,globallyenableSpanningTree:
set spantree stpmode ieee8021
3. ReviewthestatusofSpanningTreeononeormoreports:
show spantree portadmin [port port-string]
4. Ifnecessary,re‐enableSpanningTreeononeormoreports:
set spantree portadmin port-string enable
Example
Thisexampleshowshowtodisplaythedevice’sSpanningTreeconfiguration:
Enterasys->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
Adjusting Spanning Tree Parameters
YoumayneedtoadjustcertainSpanningTreeparametersifthedefaultvaluesarenotsuitablefor
yourbridgeconfiguration.ParametersaffectingtheentireSpanningTreeareconfiguredwith
variationsoftheglobalbridgeconfigurationcommands.Interface‐specificparametersare
Note: By default, Spanning Tree is enabled globally on N-Series, S-Series, stackable, and
standalone switch devices and enabled on all ports.