Allied Telesis AT-S63 - Manual (Page 7)

AT-S63 Management Software Features Guide
7
Section V: Spanning Tree Protocols ...................................................................... 217
Chapter 21: Spanning Tree and Rapid Spanning Tree Protocols ........................................................... 219
Supported Platforms....................................................................................................................................... 220
Overview......................................................................................................................................................... 221
Bridge Priority and the Root Bridge ................................................................................................................ 222
Path Costs and Port Costs....................................................................................................................... 223
Port Priority .............................................................................................................................................. 224
Forwarding Delay and Topology Changes ..................................................................................................... 226
Hello Time and Bridge Protocol Data Units (BPDU) ................................................................................ 226
Point-to-Point and Edge Ports.................................................................................................................. 227
Mixed STP and RSTP Networks .................................................................................................................... 229
Spanning Tree and VLANs............................................................................................................................. 230
Chapter 22: Multiple Spanning Tree Protocol ........................................................................................... 231
Supported Platforms....................................................................................................................................... 232
Overview......................................................................................................................................................... 233
Multiple Spanning Tree Instance (MSTI) ........................................................................................................ 234
MSTI Guidelines ............................................................................................................................................. 238
VLAN and MSTI Associations ........................................................................................................................ 239
Ports in Multiple MSTIs................................................................................................................................... 240
Multiple Spanning Tree Regions .................................................................................................................... 241
Region Guidelines.................................................................................................................................... 243
Common and Internal Spanning Tree (CIST) .......................................................................................... 244
MSTP with STP and RSTP ...................................................................................................................... 244
Summary of Guidelines .................................................................................................................................. 245
Associating VLANs to MSTIs.......................................................................................................................... 247
Connecting VLANs Across Different Regions ................................................................................................ 249
Section VI: Virtual LANs ....................................................................................... 251
Chapter 23: Port-based and Tagged VLANs ............................................................................................. 253
Supported Platforms....................................................................................................................................... 254
Overview......................................................................................................................................................... 255
Port-based VLAN Overview............................................................................................................................ 257
VLAN Name ............................................................................................................................................. 257
VLAN Identifier ......................................................................................................................................... 257
Untagged Ports ........................................................................................................................................ 258
Port VLAN Identifier ................................................................................................................................. 258
Guidelines to Creating a Port-based VLAN.............................................................................................. 259
Drawbacks of Port-based VLANs............................................................................................................. 259
Port-based Example 1.............................................................................................................................. 260
Port-based Example 2.............................................................................................................................. 261
Tagged VLAN Overview ................................................................................................................................. 263
Tagged and Untagged Ports .................................................................................................................... 264
Port VLAN Identifier ................................................................................................................................. 264
Guidelines to Creating a Tagged VLAN ................................................................................................... 264
Tagged VLAN Example............................................................................................................................ 265
Chapter 24: GARP VLAN Registration Protocol ....................................................................................... 267
Supported Platforms....................................................................................................................................... 268
Overview......................................................................................................................................................... 269
Guidelines....................................................................................................................................................... 272
GVRP and Network Security .......................................................................................................................... 273
GVRP-inactive Intermediate Switches............................................................................................................ 274
Generic Attribute Registration Protocol (GARP) Overview............................................................................. 275