Allied Telesis Switch AT-S79 Manual do Utilizador descarregar pdf (Página 110)

Chapter 9: Rapid Spanning Tree Protocol (RSTP)

110 Section I: Using the Menus Interface

Table 3 lists the RSTP port costs with Auto-Detect.

Table 4 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 3. RSTP Auto-Detect Port Costs

Port Speed Port Cost

10 Mbps 2,000,000

100 Mbps 200,000

1000 Mbps 20,000

Table 4. RSTP Auto-Detect Port Trunk Costs

Port Speed

No. of Ports/

Trunk

Port Cost

10/100/1000 2 10,000

10/100/1000 3 6,666

10/100/1000 4 5,000

10/100/1000 5 4,000

10/100/1000 6 3,333

10/100/1000 7 2,857

10/100/1000 8 2,500

1 2 ... 105 106 107 108 109 110 111 112 113 114 115 ... 241 242

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Allied Telesis Switch AT-S79 Manual do Utilizador Página 110