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SecureStack B2 Configuration Guide 9-1
9
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’sactivetopologywhenphysicaltopology orconfiguration
parameterchangesoccur.Itselectsoneswitchastherootof
aSpanningTree‐connectedactive
topologyandassignsportrolestoindividualportsontheswitch,depend ingonwhetherthatport
ispartoftheactivetopology.
RSTPprovidesrapidconnectivityfollowingthefailureofaswitch,switchport,oraLAN.Anew
rootportandthedesignatedport
ontheothersideofthebridgetransitiontoforwardi ngthrough
anexplicithandshakebetweenthem.Bydefault,userportsareconfiguredtorapidlytransitionto
forwardinginRSTP.
MSTP
TheIEEE802.1sMultipleSpanningTreeProtocol(MSTP)buildsupon802.1DandRSTPby
optimizingutilizationofredundantlinksbetweenswitchesinanetwork.Whenredundantlinks
existbetweenapairofswitchesrunningsingleSTP,onelinkisforwardingwhilethe othersare
For information about... Refer to page...
Spanning Tree Configuration Summary 9-1
Configuring Spanning Tree Bridge Parameters 9-3
Configuring Spanning Tree Port Parameters 9-33
Configuring Spanning Tree Loop Protect Parameters 9-41
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
- SecureStack 1
- Contents 7
- Chapter 7: Port Configuration 10
- Chapter 8: SNMP Configuration 12
- About This Guide 27
- Related Documents 28
- Getting Help 29
- Introduction 31
- Factory Default Settings 32
- 1-4 Introduction 34
- Starting a CLI Session 35
- Logging In 36
- CLI Command Modes 37
- Performing Keyword Lookups 37
- Displaying Scrolling Screens 38
- Basic Line Editing Commands 39
- 1-10 Introduction 40
- Important 42
- Feature Support 45
- Configuration 45
- 3-4 Basic Configuration 56
- 3-6 Basic Configuration 58
- 3-8 Basic Configuration 60
- B2(rw)->clear ip address 64
- B2(su)->show ip protocol 64
- 3-18 Basic Configuration 70
- B2(su)->show time 71
- THU SEP 05 09:21:57 2002 71
- B2(su)->set time 7:50:00 71
- 3-20 Basic Configuration 72
- _minutes] 73
- timeofonehour: 73
- 02:00 60 74
- B2(su)->clear summertime 74
- 3-24 Basic Configuration 76
- 3-26 Basic Configuration 78
- B2(su)->set width 50 80
- B2(su)->set length 50 80
- B2(su)->set logout 10 81
- Downloading a Firmware Image 82
- 3-32 Basic Configuration 84
- Reverting to a Previous Image 85
- 3-34 Basic Configuration 86
- 3-36 Basic Configuration 88
- 3-40 Basic Configuration 92
- 3-42 Basic Configuration 94
- 3-44 Basic Configuration 96
- B2(rw)->set tftp retry 3 98
- B2(rw)-> clear tftp retry 98
- Clearing and Closing the CLI 99
- Resetting the Switch 100
- Using and Configuring WebView 102
- B2(rw)->show webview 103
- WebView is Enabled 103
- 3-52 Basic Configuration 104
- 3-54 Basic Configuration 106
- Activating Licensed Features 107
- Commands 108
- Parameters 109
- Defaults 109
- Policy licensedfeature: 111
- Configuring CDP 119
- Examples 121
- Overview 131
- Configuration Tasks 132
- Port Configuration 149
- Reviewing Port Status 151
- 7-8 Port Configuration 156
- Setting Speed and Duplex Mode 158
- 7-12 Port Configuration 160
- 7-14 Port Configuration 162
- 7-16 Port Configuration 164
- 166
- Setting Flow Control 167
- 7-22 Port Configuration 170
- 7-26 Port Configuration 174
- 7-28 Port Configuration 176
- Port Mirroring 181
- 7-36 Port Configuration 184
- LACP Operation 186
- LACP Terminology 187
- 7-44 Port Configuration 192
- 7-46 Port Configuration 194
- Configuring Protected Ports 200
- 7-54 Port Configuration 202
- 7-56 Port Configuration 204
- SNMP Configuration 205
- SNMP Configuration Summary 206
- 8-2 SNMP Configuration 206
- Reviewing SNMP Statistics 207
- 8-6 SNMP Configuration 210
- 8-10 SNMP Configuration 214
- 8-12 SNMP Configuration 216
- 8-14 SNMP Configuration 218
- 8-18 SNMP Configuration 222
- Configuring SNMP MIB Views 223
- 8-24 SNMP Configuration 228
- 8-26 SNMP Configuration 230
- About SNMP Notify Filters 232
- 8-30 SNMP Configuration 234
- 8-32 SNMP Configuration 236
- 8-34 SNMP Configuration 238
- Row status = active 240
- 8-38 SNMP Configuration 242
- Spanning Tree Configuration 243
- Spanning Tree Features 244
- Loop Protect 244
- Force Version is mstp 250
- BPDU forwarding is disabled 251
- Spanguard is disabled 267
- Spanguard timeout: 300 269
- Port fe.1.1 is Unlocked 270
- Legacy Path Cost is disabled 273
- 802.1Q VLAN Configuration 297
- Viewing VLANs 298
- B2(su)->clear vlan 9 302
- Setting the Host VLAN 314
- B2(su)->set host vlan 7 315
- B2(su)->clear host vlan 315
- How It Works 316
- Purpose 317
- Configuring Policy Profiles 341
- About CoS-Based Flood Control 359
- B2(rw)->show cos state 361
- B2(su)->clear cos state 362
- 368
- B2(su)->show cos unit irl 374
- Configuring Port Priority 377
- IGMP Configuration 391
- Configuring IGMP at Layer 2 392
- 14-4 IGMP Configuration 394
- 14-6 IGMP Configuration 396
- 14-8 IGMP Configuration 398
- 14-10 IGMP Configuration 400
- Configuring System Logging 401
- Table 15-35 406
- B2(su)->show history 413
- History buffer size: 20 413
- B2(su)->set history 30 413
- [-d] [-n] [-v] host 419
- B2(su)->show mac agetime 422
- Aging time: 300 seconds 422
- B2(su)->clear mac agetime 423
- B2(su)->clear sntp client 430
- asan SNTPserver: 430
- fromtheSNTPserverlist: 431
- fromUTC 433
- Configuring Node Aliases 435
- RMON Configuration 439
- Design Considerations 440
- Statistics Group Commands 441
- 16-4 RMON Configuration 442
- History Group Commands 444
- Alarm Group Commands 447
- 16-12 RMON Configuration 450
- Event Group Commands 451
- Filter Group Commands 455
- Example 456
- "capture all" 457
- Packet Capture Commands 460
- 16-24 RMON Configuration 462
- DHCP Server Configuration 463
- Configuring a DHCP Server 464
- B2(rw)->set dhcp enable 466
- Configuring IP Address Pools 473
- DHCP Snooping and 493
- Dynamic ARP Inspection 493
- DHCP Snooping Overview 494
- Rate Limiting 495
- Basic Configuration 495
- DHCP Snooping Commands 496
- Functional Description 508
- Static Mappings 509
- Logging Invalid Packets 509
- Packet Forwarding 509
- Example Configuration 511
- DHCP Snooping Configuration 512
- Configuring RADIUS 527
- B2(su)->set eapol enable 543
- Switchcommand,read‐write 556
- Configuring MAC Locking 574
- About PWA 585
- B2(su)->clear pwa banner 589
- Guest Password: ********* 592
- B2(su)->set ssh disable 598
- Index -1 599
- Index - 2 600
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