Qtech QSW-2910-09T-POE-AC/DC [118/212] Configure stp priority od specified port

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is determined by diameter of network, and the default time of 20 seconds is suggested.

2*(Hello Time + 1) ≤ Max Age ≤ 2*(ForwardDelay – 1)

8.2.9 Configure path cost of specified interfaces

Configure interface STP path cost and choose the path with the smallest path cost to be the

effective path. The path cost is related to the link speed rate. The larger the speed rate is, the

less the cost is. STP can auto-detect the link speed rate of current interface and converse it to

be the cost. Configure it in interface configuration mode:

 Configure path cost of specified interface

spanning-tree cost cost

 Restore the default path cost of specified interface

no spanning-tree cost

Confiure path cost will cause the re-acounting of the STP. Interface path cost ranges from 1 to

65535. It is suggested to use the default cost to make STP calculate the path cost of the

current interface. By default, the path cost is determined by the current speed.

In IEEE 802.1D, the default path cost is determined by the speed of the interface. The port

with the speed 10M have the cost of 100,100M, 19; and 1000M, 4.

8.2.10 Configure STP priority od specified port

Specify specified port in STP by configuring port priority. Generally, the smaller the value is, the

superior the priority is, and the port will be more possible to be included in STP. If the priorities

are the same, the port number is considered. Configure it in interface configuration mode:

 Configure port priority

spanning-tree port-priority port-priority

 Restore the default port priority

no spanning-tree port-priority

The smaller the value is, the superior the priority is, and the port is easier to be the root

interface. Change the port priority may cause the re-calculating of the STP. The port priority

ranges from 0 to 255. the default port priority is 128.

For example:

!Configure the port priority of Ethernet 0/1 in STP to 120

QTECH(config-if-ethernet-0/1)#spanning-tree port-priority 120

8.2.11 Configure interface to force to send rstp packet

This configuration is used to check whether there is traditional network bridge running STP.

Configure it in interface configuration mode: