Allied-telesis AT-S41 Manuel d'utilisateur Page 81
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AT-S41 User’s Guide
81
Finding and
Resolving
Redundant
Paths
Once the root bridge has been selected, the bridges must determine if
the network contains redundant paths and, if one is found, they must
select a preferred path while placing the redundant paths in a backup or
blocking state.
Where there is only one path between a bridge and a root bridge, the
bridge is referred to as the designated bridge and the port through
which the bridge is communicating with the root bridge is referred to as
the designated port.
If redundant paths exist, the bridges that are a part of the paths must
determine which path will be the primary, active path, and which path(s)
will be placed in the standby, blocking mode. This is accomplished by an
evaluation of port costs. The path offering the lowest cost to the root
bridge becomes the primary path and all other redundant paths are
placed into blocking state.
Every port on a bridge participating in STP has a cost associated with it.
The cost of a port on a bridge is typically based on port speed. The faster
the port, the lower the port cost. The exception to this is the ports on the
root bridge, where all ports have a port cost of 0.
The port costs for the ports on the AT-8326GB Fast Ethernet switch are
adjustable through the management software. Below are standard
default port cost values.
The port costs for the ports on the AT-8326GB Fast Ethernet switch are
adjustable through the management software. Below are the default
port cost values.
Table 1 Standard Port Costs
Port Speed Port Cost
10 Mbps 100
100 Mbps 10
1000 Mbps 4
Table 2 AT-8326GB Port Costs
Port Speed Port Cost
10 Mbps 19
100 Mbps 19
1000 Mbps 4
- User’s Guide 1
- Table of Contents 3
- Section III 6
- List of Figures 8
- How This Guide is Organized 10
- Document Conventions 11
- Overview 15
- Management Software Overview 16
- Local Management Session 18
- Telnet Management Session 19
- SNMP Management Session 21
- Stacking 22
- Stacking Overview 23
- Local and Telnet Management 25
- Starting a Local or Telnet 26
- Starting a Local 28
- Command> 29
- Local Session 30
- AT-8326GB 33
- How Do You 33
- Assign an IP 33
- Address? 33
- Port Security Overview 59
- Setting a Threshold 63
- Setting Intrusion Detection 64
- Port Trunking 65
- Port Trunking Overview 66
- Creating a Port Trunk 69
- Enter trunk group number-> 70
- Deleting a Port Trunk 71
- Setting Port Trunk Status 72
- Port Monitoring Overview 74
- Enabling Port Monitoring 75
- Modifying Port Monitoring 77
- Disabling Port Monitoring 78
- STP Overview 80
- Finding and 81
- Resolving 81
- Redundant 81
- VLAN Overview 90
- Tagged Ports 93
- Untagged and 93
- General Rules 95
- Untagged or 95
- Tagged VLAN 95
- Enter PVID for port 1> 100
- Enter VLAN ID> 101
- AT-S41 User’s Guide 102
- Port-based VLAN Mode Overview 106
- Creating a Port-based VLAN 107
- Enter Stack ID > 108
- Enter port number> 108
- Modifying a Port-based VLAN 110
- Setting GVRP Status 112
- Setting the VLAN Type 114
- MAC Address Table 115
- MAC Address Overview 116
- Displaying MAC Addresses 118
- Viewing MAC Addresses by Port 120
- Adding Static MAC Addresses 123
- Deleting Static MAC Addresses 124
- Changing the Aging Time 125
- Quality of Service 126
- Quality of Service Overview 127
- Configuring QoS 128
- Queue is in range of 0 to 1 129
- IGMP Snooping 130
- IGMP Snooping Overview 131
- Activating IGMP Snooping 132
- Viewing Group Members 134
- Group Members 135
- Broadcast Storm Control 136
- Port Statistics 139
- Displaying Port Statistics 140
- Management Software Updates 143
- Obtaining Software Updates 144
- Management Session 145
- Download file (Y/N)> 150
- Web Browser Management 151
- Starting a Web Browser 152
- Switch’s IP Address 153
- Quitting from a 155
- Web Browser 155
- Management 155
- Basic Switch Parameters 156
- Configuring an IP Address 157
- Activating DHCP 163
- Rebooting a Switch 167
- Ping Execution 169
- Bootstrap Configuration 171
- Port Parameters 173
- Configuring Port Parameters 174
- Configuring Gigabit Port Type 177
- Displaying Port Status 178
- Port Security 183
- Configuring Port Security 184
- Port Trunks 187
- Port Monitoring 190
- Configuring Port Monitoring 191
- Spanning Tree Protocol 192
- Configuring STP Port Settings 195
- Virtual LANs 197
- AT-S41 Default Settings 235
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