Allied-telesis AT-S81 Bedienungsanleitung PDF herunterladen (Seite 156)

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101

Chapter 12: Rapid Spanning Tree Protocol (RSTP)

156 Section II: Menus Interface

Table 4 lists the RSTP port costs with Auto-Detect.

Table 5 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. However,

you must assign the same port cost to all ports that are members of a

trunk.

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, in hexadecimal format, is 0 to 240, with 240

being the highest priority. As with bridge priority, this range is broken into

multiples of 16. To select a port priority for a port, you enter the desired

value.

Table 4. RSTP Auto-Detect Port Costs

Port Speed Port Cost

10 Mbps 2,000,000

100 Mbps 200,000

1000 Mbps 20,000

Table 5. RSTP Auto-Detect Port Trunk Costs

Port Speed

No. of Ports/

Trunk

Port Cost

10/100 2 100,000

10/100 3 66,666

10/100 4 50,000

1 2 ... 151 152 153 154 155 156 157 158 159 160 161 ... 359 360

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