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Chapter 15: STP and RSTP

Section II: Advanced Features 232

The port costs of the ports on an AT-8400 Series switch can be adjusted

through the management software. For STP and RSTP, the range is 0 to

200,000,000.

The default value of 0 activates auto-detection. This features sets port

cost according to port speed, assigning lower costs to ports operating at

higher speeds.

Table 10 lists the auto-detection default values for STP and RSTP.

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 can be used as a tie-breaker when two paths

have the same cost.

Table 10 STP and RSTP Auto-Detect Port Costs

Port Speed Port Cost

10 Mbps 2000000

100 Mbps 200000

1000 Mbps 20000

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