Allied-telesis AT-S63 Manual de usuario descargar pdf (Pagina 218)

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Chapter 20: Spanning Tree and Rapid Spanning Tree Protocols

218 Section V: Spanning Tree Protocols

Table 16 lists the STP port costs with Auto-Detect when a port is part of a

port trunk.

Table 17 lists the RSTP port costs with Auto-Detect.

Table 18 lists the RSTP port costs with Auto-Detect when the port is part

of a port trunk.

You can override Auto-Detect and set the port cost manually.

Port Priority If two paths have the same port cost, the bridges must select a preferred

path. In some instances this can involve the use of the port priority

parameter. This parameter is used as a tie breaker when two paths have

the same cost.

The range for port priority is 0 to 240. As with bridge priority, this range is

broken into increments, in this case multiples of 16. To select a port

priority for a port, you enter the increment of the desired value. Table 19

lists the values and increments. The default value is 128, which is

increment 8.

Table 16. STP Auto-Detect Port Trunk Costs

Port Speed Port Cost

10 Mbps 4

100 Mbps 4

1000 Mbps 2

Table 17. RSTP Auto-Detect Port Costs

Port Speed Port Cost

10 Mbps 2,000,000

100 Mbps 200,000

1000 Mbps 20,000

Table 18. RSTP Auto-Detect Port Trunk Costs

Port Speed Port Cost

10 Mbps 20,000

100 Mbps 20,000

1000 Mbps 2,000

1 2 ... 213 214 215 216 217 218 219 220 221 222 223 ... 513 514

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Allied-telesis AT-S63 Manual de usuario Pagina 218

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