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Enterasys D-Series CLI Reference 8-1
8
Spanning Tree Configuration
ThischapterdescribestheSpanningTreeConfigurationsetofcommandsandhowtousethem.
Spanning Tree Configuration Summary
Overview: Single, Rapid, and Multiple Spanning Tree Protocols
TheIEEE802.1DSpanningTreeProtocol(STP)resolvestheproblemsofphysicalloopsina
networkbyestablishingoneprimarypathbetweenanytwodevicesinanetwork.Anyduplicate
pathsarebarredfromuseandbecomestandbyorblockedpathsuntiltheoriginalpathfails,at
whichpointtheycan
bebroughtintoservice.
RSTP
TheIEEE802.1wRapidSpanningProtocol(RSTP),anevolutionof802.1D,canachievemuch
fasterconvergencethanlegacySTPinaproperlyconfigurednetwork.RSTPsignificantlyreduces
thetimetoreconfigurethenetwork’sactivetopologywhenphysicaltopologyorconfiguration
parameterchangesoccur.Itselectsoneswitchastherootof
aSpanningTree‐connectedactive
topologyandassignsportrolestoindividualportsontheswitch,dependingonwhetherthatport
ispartoftheactivetopology.
RSTPprovidesrapidconnectivityfollowingthefailureofaswitch,switchport,oraLAN.Anew
rootportandthedesignatedport
ontheothersideofthebridgetransitiontoforwardingthrough
anexplicithandshakebetweenthem.Bydefault,userportsareconfiguredtorapidlytransitionto
forwardinginRSTP.
MSTP
TheIEEE802.1sMultipleSpanningTreeProtocol(MSTP)buildsupon802.1DandRSTPby
optimizingutilizationofredundantlinksbetweenswitchesinanetwork.Whenredundantlinks
existbetweenapairofswitchesrunningsingleSTP,onelinkisforwardingwhiletheothersare
For information about... Refer to page...
Spanning Tree Configuration Summary 8-1
Configuring Spanning Tree Bridge Parameters 8-3
Configuring Spanning Tree Port Parameters 8-33
Configuring Spanning Tree Loop Protect Parameters 8-41
Caution: Spanning Tree configuration should be performed only by personnel who are very
knowledgeable about Spanning Trees and the configuration of the Spanning Tree Algorithm.
Otherwise, the proper operation of the network could be at risk.
- Enterasys 1
- D-Series 1
- Contents 7
- Chapter 6: Port Configuration 10
- Chapter 7: SNMP Configuration 12
- About This Guide 25
- Related Documents 26
- Getting Help 27
- Introduction 29
- Factory Default Settings 30
- 1-4 Introduction 32
- Starting a CLI Session 33
- Logging In 34
- CLI Command Modes 35
- Performing Keyword Lookups 35
- Displaying Scrolling Screens 36
- Basic Line Editing Commands 37
- 1-10 Introduction 38
- Basic Configuration 39
- 2-4 Basic Configuration 42
- 2-6 Basic Configuration 44
- 2-8 Basic Configuration 46
- 2-10 Basic Configuration 48
- D2(rw)->clear ip address 49
- D2(su)->show ip protocol 50
- Switchcommand,read‐only 51
- 2-14 Basic Configuration 52
- 2-16 Basic Configuration 54
- D2(su)->show time 55
- THU SEP 05 09:21:57 2002 55
- D2(su)->set time 7:50:00 55
- 2-18 Basic Configuration 56
- 2-20 Basic Configuration 58
- D2(rw)->clear banner motd 60
- 2-24 Basic Configuration 62
- D2(su)->set width 50 63
- D2(su)->set length 50 64
- D2(su)->set logout 10 65
- D2(su)->show console 65
- Downloading a Firmware Image 66
- Reverting to a Previous Image 68
- 2-36 Basic Configuration 74
- 2-38 Basic Configuration 76
- 2-40 Basic Configuration 78
- 2-42 Basic Configuration 80
- D2(rw)->set tftp retry 3 81
- D2(rw)-> clear tftp retry 81
- Clearing and Closing the CLI 82
- Resetting the Switch 83
- D2(su)->clear config all 84
- Using and Configuring WebView 85
- D2(rw)->show ssl 86
- SSL status: Enabled 86
- 2-50 Basic Configuration 88
- Activating Licensed Features 89
- Configuring CDP 97
- Commands 103
- Parameters 104
- Defaults 104
- Examples 108
- Overview 109
- Configuration Tasks 110
- Port Configuration 127
- Reviewing Port Status 129
- 6-4 Port Configuration 130
- 6-8 Port Configuration 134
- Setting Speed and Duplex Mode 136
- 6-12 Port Configuration 138
- 6-14 Port Configuration 140
- 6-16 Port Configuration 142
- 144
- Setting Flow Control 145
- 6-22 Port Configuration 148
- 6-26 Port Configuration 152
- 6-28 Port Configuration 154
- Port Mirroring 159
- 6-34 Port Configuration 160
- LACP Operation 162
- LACP Terminology 163
- D-Series Usage Considerations 163
- 6-42 Port Configuration 168
- 6-44 Port Configuration 170
- Configuring Protected Ports 176
- 6-52 Port Configuration 178
- 6-54 Port Configuration 180
- SNMP Configuration 181
- SNMP Configuration Summary 182
- 7-2 SNMP Configuration 182
- Reviewing SNMP Statistics 183
- 7-6 SNMP Configuration 186
- 7-10 SNMP Configuration 190
- 7-12 SNMP Configuration 192
- 7-14 SNMP Configuration 194
- 7-18 SNMP Configuration 198
- Configuring SNMP MIB Views 199
- 7-24 SNMP Configuration 204
- 7-26 SNMP Configuration 206
- About SNMP Notify Filters 208
- 7-30 SNMP Configuration 210
- 7-32 SNMP Configuration 212
- 7-34 SNMP Configuration 214
- Row status = active 216
- 7-38 SNMP Configuration 218
- Spanning Tree Configuration 219
- Spanning Tree Features 220
- Loop Protect 220
- Force Version is mstp 226
- BPDU forwarding is disabled 227
- Spanguard is disabled 243
- Spanguard timeout: 300 245
- Legacy Path Cost is disabled 249
- 802.1Q VLAN Configuration 273
- Viewing VLANs 274
- 9-4 802.1Q VLAN Configuration 276
- D2(su)->clear vlan 9 278
- Setting the Host VLAN 290
- D2(su)->set host vlan 7 291
- D2(su)->clear host vlan 291
- How It Works 292
- Purpose 293
- Configuring Policy Profiles 317
- D2(rw)->show cos state 336
- D2(su)->clear cos state 337
- [type {drop}]} 342
- Configuring Port Priority 349
- IGMP Configuration 363
- Configuring IGMP at Layer 2 364
- 13-4 IGMP Configuration 366
- 13-6 IGMP Configuration 368
- 13-8 IGMP Configuration 370
- 13-10 IGMP Configuration 372
- Configuring System Logging 373
- Table 14-34 378
- D2(su)->show history 385
- History buffer size: 20 385
- D2(su)->set history 30 385
- [-d] [-n] [-v] host 390
- D2(su)->show mac agetime 393
- Aging time: 300 seconds 393
- D2(su)->clear mac agetime 394
- D2(su)->clear sntp client 401
- asan SNTPserver: 401
- fromtheSNTPserverlist: 402
- fromUTC 404
- Configuring Node Aliases 406
- RMON Configuration 409
- 15-2 RMON Configuration 410
- Statistics Group Commands 411
- 15-4 RMON Configuration 412
- Example 413
- History Group Commands 414
- Alarm Group Commands 417
- 15-12 RMON Configuration 420
- Event Group Commands 421
- Filter Group Commands 425
- "capture all" 427
- Packet Capture Commands 430
- 15-24 RMON Configuration 432
- DHCP Server Configuration 433
- Configuring a DHCP Server 434
- D2(rw)->set dhcp enable 436
- Configuring IP Address Pools 443
- Security Configuration 463
- Overview of Security Methods 464
- 17-2 Security Configuration 464
- Configuring RADIUS 465
- 17-8 Security Configuration 470
- 17-14 Security Configuration 476
- 17-16 Security Configuration 478
- 17-18 Security Configuration 480
- D2(su)->set eapol enable 481
- 17-24 Security Configuration 486
- 17-26 Security Configuration 488
- 17-28 Security Configuration 490
- 17-30 Security Configuration 492
- Switchcommand,read‐write 494
- 17-36 Security Configuration 498
- 17-38 Security Configuration 500
- 17-40 Security Configuration 502
- 17-42 Security Configuration 504
- 17-46 Security Configuration 508
- 17-48 Security Configuration 510
- 17-50 Security Configuration 512
- Configuring MAC Locking 513
- 17-54 Security Configuration 516
- 17-56 Security Configuration 518
- 17-58 Security Configuration 520
- 17-60 Security Configuration 522
- About PWA 524
- D2(su)->clear pwa banner 528
- 17-68 Security Configuration 530
- Guest Password: ********* 531
- 17-70 Security Configuration 532
- 17-72 Security Configuration 534
- D2(su)->set ssh disable 537
- 17-76 Security Configuration 538
- Index-1 539
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