Qtech QSW-8200-28F-AC-DC — настройка команд MSTP: Forward Time, Hello Time и Link Type [9/23]

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User Manual

Chapter 1. Commands for MSTP 9

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1.1.12 spanning-tree forward-time

 Command: spanning-tree forward-time <time>

 no spanning-tree forward-time

 Function: Set the switch forward delay time; the command “no spanning-tree forward-

time” restores the default setting.

 Parameter: <time> is forward delay time in seconds. The valid range is from 4 to 30.

 Command mode: Global Mode

 Default: The forward delay time is 15 seconds by default.

 Usage Guide: When the network topology changes, the status of the port is changed

from blocking to forwarding. This delay is called the forward delay. The forward delay is

co working with hello time and max age. The parameters should meet the following

conditions. Otherwise, the MSTP may work incorrectly.

 2 * (Bridge_Forward_Delay - 1.0 seconds) >= Bridge_Max_Age

 Bridge_Max_Age >= 2 * (Bridge_Hello_Time + 1.0 seconds)

 Example: In global mode, set MSTP forward delay time to 20 seconds.

 Switch(config)#spanning-tree forward-time 20

1.1.13 spanning-tree hello-time

 Command: spanning-tree hello-time <time>

 no spanning-tree hello-time

 Function: Set switch Hello time; The command “no spanning-tree hello-time” restores

the default setting.

 Parameter: <time> is Hello time in seconds. The valid range is from 1 to 10.

 Command mode: Global Mode

 Default: Hello Time is 2 seconds by default.

 Usage Guide: Hello time is the interval that the switch sends BPDUs. Hello time is co

working with forward delay and max age. The parameters should meet the following

conditions. Otherwise, the MSTP may work incorrectly.

 2 * (Bridge_Forward_Delay - 1.0 seconds) >= Bridge_Max_Age

 Bridge_Max_Age >= 2 * (Bridge_Hello_Time + 1.0 seconds)

 Example: Set MSTP hello time to 5 seconds in global mode.

 Switch(config)#spanning-tree hello-time 5

1.1.14 spanning-tree link-type p2p

 Command: spanning-tree link-type p2p {auto | force-true | force-false}

 no spanning-tree link-type

 Function: Set the link type of the current port; the command “no spanning-tree link-

type” restores link type to auto-negotiation.

 Parameter: auto sets auto-negotiation, force-true forces the link as point-to-point type,

force-false forces the link as non point-to-point type.