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Chapter 9: Rapid Spanning Tree Protocol (RSTP)
114 Section I: Using the Menus Interface
compatible mode, the ports can receive either RSTP or STP BPDU
packets.
Rapid Spanning
Tree and VLANs
The spanning tree implementation in the AT-S79 management software is
a single-instance spanning tree. The switch supports just one spanning
tree. You cannot define multiple spanning trees.
The single spanning tree encompasses all ports on the switch. If the ports
are divided into different VLANs, the spanning tree crosses the VLAN
boundaries. This point can pose a problem in networks containing multiple
VLANs that span different switches and are connected with untagged
ports. In this situation, STP blocks a data link because it detects a data
loop. This can cause fragmentation of your VLANs.
This issue is illustrated in Figure 29. Two VLANs, Sales and Production,
span two switches. Two links consisting of untagged ports connect the
separate parts of each VLAN. If RSTP is activated on the switches, one of
the links is disabled. In the example, the port on the top switch that links
the two parts of the Production VLAN is changed to the block state. This
leaves the two parts of the Production VLAN unable to communicate with
each other.
Figure 29. VLAN Fragmentation
You can avoid this problem by not activating rapid spanning tree or by
connecting VLANs using tagged port members instead of untagged ports.
(For information on tagged and untagged ports, refer to Chapter 7, “Virtual
LANs” on page 71.)
732
1 3 5791113 15 17 19 21 23
POWER
24681012141618202224 23 24
LINK/ACT
LINK/ACT
SPEED
LINK/ACT
SPEED
AT-G S950/24 24-Port 10/100/1000Mbps + 2 SFP Combo WebSmart Switch
732
1 3 5791113 15 17 19 21 23
POWER
24681012141618202224 23 24
LINK/ACT
LINK/ACT
SPEED
LINK/ACT
SPEED
AT-G S950/24 24-Port 10/100/1000Mbps + 2 SFP Combo WebSmart Switch
Sales
VLAN
Production
VLAN
Production
VLAN
Sales
VLAN
Blocked Port
Blocked Data Link
- User’s Guide 1
- Contents 3
- Document Conventions 13
- Contacting Allied Telesyn 14
- Overview 15
- Management Overview 16
- Local Management Connection 17
- Remote Management Connection 18
- Management Access Level 19
- AT-GS950/24 Switch 20
- Using the Menus Interface 21
- Interface 23
- Enter system location> 35
- Enter system contact> 35
- Enter current password> 37
- Enter old password> 38
- Enter new password> 38
- Retype new password> 38
- Viewing Switch Information 39
- Rebooting the Switch 42
- Enter new timeout value> 45
- Figure 12. Ping Results 46
- Chapter 4: Port Configuration 50
- Enabling and Disabling a Port 53
- Enter new mode for port 54
- (a/h/H/F/f/t/T)> 54
- Port Trunking Overview 58
- Chapter 5: Port Trunking 60
- (E/D)> 61
- Enter trunk group number> 63
- Port Mirroring Overview 66
- Chapter 6: Port Mirroring 68
- VLAN Features 72
- Port-based VLANs 73
- Tagged VLANs 73
- Port-based VLAN Overview 74
- Drawbacks of 76
- Example 1 77
- Example 2 78
- Tagged VLAN Overview 80
- Tagged VLAN 82
- Enter port number > 86
- Enter PVID for port 87
- Chapter 7: Virtual LANs 88
- QoS Overview 96
- Configuring CoS 102
- Chapter 9 107
- RSTP Overview 108
- Path Costs and Port Costs 109
- Port Priority 110
- Point-to-Point and Edge Ports 111
- Point-to-Point Ports 112
- (Full-duplex Mode) 112
- Mixed STP and 113
- RSTP Networks 113
- Rapid Spanning 114
- Tree and VLANs 114
- Enabling or Disabling RSTP 115
- Enter bridge priority> 118
- Enter bridge hello time> 118
- Enter bridge maximum age> 119
- Configuring STP Compatibility 120
- Configuring the 121
- Basic RSTP Port 121
- Settings 121
- Advanced RSTP 123
- Port Settings 123
- Displaying the RSTP Topology 126
- Chapter 10 129
- Authentication 131
- Authenticator 131
- Port-based 133
- Network Access 133
- Guidelines 133
- Switch A 135
- Switch B 135
- Enter port number> 137
- Chapter 11 141
- RADIUS Overview 142
- Configuring the RADIUS Client 143
- Enter response time> 144
- Broadcast Storm Control 147
- Management Software Updates 151
- Enter file name> 154
- Enter retry count> 154
- Download file? (Y/N)> 154
- Section II 155
- Chapter 14 157
- Switch’s IP Address 158
- Web Browser Tools 161
- Basic Switch Parameters 163
- System Contact 168
- 3. Click Apply 168
- Viewing System Information 172
- DHCP Mode 174
- Client” on page 166 174
- Rebooting a Switch 175
- Pinging a Remote System 176
- Port Configuration 179
- Displaying Port Statistics 186
- Port Trunking 189
- Creating a Port Trunk 190
- Modifying a Port Trunk 192
- Chapter 17: Port Trunking 194
- Port Mirroring 195
- Configuring Port Mirroring 196
- Disabling Port Mirroring 197
- Chapter 18: Port Mirroring 198
- Virtual LANs 199
- Creating a VLAN 200
- Chapter 19: Virtual LANs 202
- Displaying the VLANs 204
- Modifying a VLAN 205
- Deleting a VLAN 207
- Quality of Service (QoS) 209
- Chapter 21 215
- Basic RSTP Configuration 216
- Bridge Forward Delay 218
- Viewing the RSTP Topology 222
- Designated Port 223
- Chapter 22 225
- Chapter 23 229
- Appendix A 237
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