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Multiple Instance Spanning-Tree Operation
802.1s Multiple Spanning Tree Protocol (MSTP)
In a mesh environment, the default MSTP timer settings (Hello Time and
Forward Delay) are usually adequate for MSTP operation. Because a packet
crossing a mesh may traverse several links within the mesh, using smaller-
than-default settings for the MSTP Hello Time and Forward Delay timers can
cause unnecessary topology changes and end-node connectivity problems.
For MSTP information beyond what is provided in this manual, refer to the
IEEE 802.1s standard.
MSTP Structure
MSTP maps active, separate paths through separate spanning tree instances
and between MST regions. Each MST region comprises one or more MSTP
switches. Note that MSTP recognizes an STP or RSTP LAN as a distinct
spanning-tree region.
IST
Instance
MSTI
(Optional)
MSTI
(Optional)
IST
Instance
MSTI
(Optional)
MSTI
(Optional)
MSTI
(Optional)
Switch
Running STP
Switch
Running STP
Switch
Running STP
Switch
Running RSTP
Switch
Running RSTP
Switch
Running RSTP
Common Spanning Tree (CST)
MST Region
MST Region
Common and Internal Spanning Tree (CIST)
Figure 4-2. Example of MSTP Network with Legacy STP and RSTP Devices
Connected
4-7
- HP ProCurve Switch Software 1
- March 2010 3
- K.14.52 3
- 3 GVRP 7
- 5 Switch Meshing 9
- . . . 6-49 11
- 8 QinQ (Provider Bridging) 13
- Product Documentation 17
- Software Feature Index 18
- Intelligent Edge Software 19
- Features 19
- Getting Started 25
- Conventions 26
- Command Prompts 27
- Screen Simulations 27
- Sources for More Information 28
- Online Help 30
- Need Only a Quick Start? 31
- Network 32
- Static Virtual LANs (VLANs) 33
- Port-Based VLANs 38
- Protocol-Based VLANs 38
- Designated VLANs 38
- Static VLAN Operation 40
- VLAN Environments 41
- VLAN Operation 42
- Routing Options for VLANs 43
- Overlapping (Tagged) VLANs 44
- VLAN Operating Rules 47
- Multiple VLAN Considerations 52
- Correct It 54
- Switch 8000M 55
- 8212zl Switch 55
- (Routing Enabled) 55
- Adding or Editing VLAN Names 58
- Default VLAN 59
- [E] (for Edit) 61
- Parameters 62
- Syntax: 68
- “Show VLANs Custom” Command 71
- [ voice] 74
- [Vlan Configuration] 77
- [Add/Remove VLANs] 77
- 802.1Q VLAN Tagging 78
- ■ In switch X: 79
- ■ In switch Y: 79
- VID Numbers 80
- Special VLAN Types 83
- The Secure Management VLAN 84
- Preparation 86
- Deleting the Management VLAN 91
- Voice VLANs 92
- IP Interfaces 95
- VLAN MAC Address 95
- Port Trunks 95
- Port Monitoring 95
- Jumbo Packet Support 95
- VLAN Restrictions 96
- MAC Configuration 97
- Address 99
- Interval 100
- Example 101
- Contents 103
- Overview 104
- Introduction 105
- General Operation 106
- “Unknown VLANs” 109
- GVRP Enabled 110
- (Required for Unknown 110
- VLAN operation.) 110
- Unknown VLAN Settings 110
- Default: 110
- Advertising and Joining 111
- GVRP and VLAN Access Control 113
- Planning for GVRP Operation 114
- Configuring GVRP On a Switch 115
- GVRP Operating Notes 120
- 10, 11, 12 Yes No 126
- 20, 21, 22 No Yes 126
- Region “A”: Logical Topology 127
- MSTP Structure 129
- How MSTP Operates 131
- Region “X” 132
- Common Spanning Tree (CST) 133
- Problem: 134
- Solution: 134
- Terminology 135
- Operating Rules 137
- Configuring MSTP 139
- Rapid State 140
- Transitions 140
- MSTP Configuration Overview 141
- Configuring BPDU Filtering 152
- Configuring BPDU Protection 153
- Specifying the port displays 155
- Protection Enabled (Yes) 160
- Configuration 175
- Instance-Specific Data 181
- Port Settings for the 181
- Refer to the “Note”, above 182
- CIST Instance 189
- Instance 190
- Loop Protection 196
- Configuring Loop Protection 197
- Switch Meshing 199
- Switch Meshing Fundamentals 202
- Configuring Switch Meshing 207
- Viewing Switch Mesh Status 210
- Flooded Traffic 214
- Note on the Edge 217
- Port Mode in MSTP 217
- Static VLANs 218
- Dynamic VLANs 219
- Jumbo Packets 219
- Mesh Design Optimization 220
- Effectively 223
- QoS Terminology 229
- QoS Operation 231
- Globally-Configured QoS 232
- Classifier-Based QoS 233
- QoS Packet Classification 234
- QoS Traffic Marking 236
- Layer 3 DSCP Marking 238
- Global QoS 240
- Settings 240
- Global QoS Restrictions 244
- Global TCP/UDP Classifier 246
- The DSCP codepoints 252
- Global IP-Device Classifier 255
- IP-Precedence Classifier 266
- The DSCPs for this 273
- 802.1p priority level 273
- Global VLAN-ID Classifier 278
- Classifier-Based QoS Model 293
- DSCP-802.1p 301
- Mapping 301
- (DSCP) Mapping 310
- QoS Queue Configuration 317
- Switches 323
- General Stacking Operation 325
- Operating Rules for Stacking 327
- Specific Rules 328
- Configuring Stack Management 329
- and Configure Stacking 333
- [E] (for Edit). Then 334
- [B] (for Back) to return to 340
- [Return] 344
- Monitoring Stack Status 345
- Stacking 349
- Big_Waters 353
- Yes. When 355
- SN of 2, you 357
- MAC Address for 358
- Stack Commander 358
- Auto Join parameter 360
- The switch number 362
- (SN) for the “North 362
- Sea” switch is “3” 362
- Transmission Interval 364
- Status Messages 365
- QinQ (Provider Bridging) 367
- How QinQ Works 371
- Features and Benefits 371
- QinQ Mixed Vlan Mode 374
- Configuring VLANs 374
- Untagged) 375
- Tagged) 375
- Configuring QinQ 379
- Enabling QinQ 380
- Setting up S-VLANs 380
- Configuring Port-Types 382
- Configuration Example 383
- Provider 384
- Updating QinQ Configurations 388
- Vlan Mode) 389
- Show Commands for QinQ 390
- Show Commands for VLANs 391
- SNMP Support and MIB Objects 399
- Creating a Traffic Class 406
- > are as follows: 409
- — Matches packets received 410
- — Matches 410
- Optional ICMP Match Criteria 415
- Optional IGMP Match Criteria 418
- Creating a Service Policy 426
- Where to Go From Here 435
- Numerics 437
- 2 – Index 438
- Index – 3 439
- 4 – Index 440
- Index – 5 441
- 6 – Index 442
- Index – 7 443
- 8 – Index 444
- Index – 9 445
- 10 – Index 446
- Index – 11 447
- 12 – Index 448
- ProCurve 5400zl Switches 450
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