Allied-telesis AT-S106 Manuel d'utilisateur Page 152
- Page / 226
- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Chapter 13: Spanning Tree and Rapid Spanning Tree Protocols
152
Spanning Tree and VLANs
The spanning tree implementation in the AT-S106 Management software
is a single-instance spanning tree. The AT-GS950/48 Gigabit Ethernet
Smart Switch both support just one spanning tree. You cannot define
multiple spanning trees on either switch.
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 can pose a problem in networks containing multiple
VLANs that span two bridges and are connected with untagged ports. In
this situation, spanning tree blocks a data link because it detects a
suspected data loop. This can cause fragmentation of your VLANs.
This issue is illustrated in Figure 42. VLANs 1 – 3 span two switches. One
link consisting of untagged ports connect each VLAN. If STP or RSTP is
activated on the switches, two of the links are disabled. As a direct result,
two VLANs are disconnected between the bridges. In this example, the
ports (on the non-root switch) that link the two parts of the VLANs 2 - 3 are
changed to the blocking state, which disrupts these VLAN connections.
Figure 46. STP and VLAN Fragmentation with Untagged Ports
VLAN1
VLAN3
VLAN2
Blocked Data Links
Ports Blocked by STP
U
U
U
U
U
U
VLAN1
VLAN3
VLAN2
- Management 1
- Software 1
- Web Browser 1
- User’s Guide 1
- Contents 3
- List of Figures 7
- List of Tables 10
- Contacting Allied Telesis 13
- Chapter 1 15
- Switch’s IP Address 16
- Web Browser Tools 20
- Basic Switch Parameters 23
- Setting Up the IP Access List 26
- Deleting an IP 27
- Adding System 33
- Administration 33
- Information 33
- Modifying 34
- Deleting 35
- Viewing System Information 37
- Rebooting a Switch 40
- Pinging a Remote System 42
- Virtual LANs 45
- VLAN Overview 46
- Tagged VLAN 48
- Tagged and Untagged Ports 49
- Port VLAN Identifier 49
- Chapter 3: Virtual LANs 50
- Creating a Tagged VLAN 51
- Modifying a Tagged VLAN 53
- Deleting a Tagged VLAN 55
- Creating a Port-Based VLAN 56
- Modifying a Port-Based VLAN 57
- Deleting a Port-Based VLAN 58
- Quality of Service (QoS) 59
- Configuring CoS 65
- Port Configuration 69
- Chapter 5: Port Configuration 72
- Static Port Trunking 75
- Port Trunking Overview 76
- Static Port Trunk Guidelines 77
- Creating a Port Trunk 79
- Modifying a Port Trunk 81
- 6. Click Apply 82
- Disabling a Port Trunk 83
- LACP Port Trunks 85
- LACP Overview 86
- LACP System Priority 90
- Key Parameter 90
- LACP Port Priority Value 90
- Displaying LACP Group Status 94
- Chapter 7: LACP Port Trunks 96
- Selecting Port Priority 97
- Chapter 8 99
- SNMP Overview 100
- Community String Attributes 102
- Creating an SNMP Community 105
- Modifying an SNMP Community 106
- Deleting an SNMP Community 107
- Creating a Host Table 108
- Modifying a Host Table Entry 109
- Deleting a Host Table Entry 110
- Enabling or Disabling Traps 111
- Modifying Traps 112
- Deleting Traps 113
- IGMP Snooping 115
- Overview 116
- Configuring IGMP Snooping 118
- Chapter 9: IGMP Snooping 120
- Bandwidth Control 121
- Ingress Rate 123
- Limiting 123
- Egress Rate 123
- Setting Storm Control 124
- Setting Ingress Rate Limiting 126
- Setting Egress Rate Limiting 128
- Chapter 10: Bandwidth Control 130
- Port Mirroring 131
- Configuring Port Mirroring 133
- Disabling Port Mirroring 134
- Static Multicast MAC Address 135
- Tree Protocols 143
- Path Costs and 146
- Port Costs 146
- Hello Time and 148
- Bridge Protocol 148
- Data Units 148
- Point-to-Point 149
- Edge Port 150
- Workstation 150
- Mixed STP and RSTP Networks 151
- Spanning Tree and VLANs 152
- Configuring the 157
- Basic RSTP Port 157
- Settings 157
- Advanced RSTP 159
- Port Settings 159
- Chapter 14 165
- Authentication 167
- Authenticator 167
- Port-based 170
- Network Access 170
- Guidelines 170
- Switch A 171
- Switch B 171
- Guest VLANs 172
- Chapter 15 177
- Configuring the RADIUS Client 179
- Dial-in User Configuration 181
- Configuring a Dial-in User 183
- Delete a Dial-in 184
- Destination MAC Filter 185
- Management Software Updates 189
- Configuration 195
- File Upload 195
- File Download 196
- Figure 64. Result Page 197
- Statistics 201
- Chapter 19: Statistics 204
- Browser Default Parameters 213
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