Stp Root Secondary - H3C S7500E Series Command Manual

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Command Manual – MSTP

H3C S7500E Series Ethernet Switches

centi-seconds: Hello time (in centiseconds) of the spanning tree, in the range of 100 to

Use the stp root primary command to configure the current device as the root bridge.

Use the undo stp root command to restore the system default.

By default, a device is not a root bridge.

If you do not provide instance instance-id, your configuration will take effect in the

CIST instance only.

There is only one root bridge in effect in a spanning tree instance. If two or more

devices have been designated to be root bridges of the same spanning tree

instance, MSTP will select the device with the lowest MAC address as the root

You can specify a root bridge for each spanning tree instance without caring about

the device priority. After specifying the current device as the root bridge or a

secondary root bridge, you cannot change the priority of the device.

When configuring a root bridge, you can use this command to specify the network

diameter of the switched network, so that the MSTP-compliant device

automatically calculates the three timers (hello time, forward delay and max age).

As the calculated hello time value is not the optimal value, you can specify a hello

time value by providing hello-time centi-seconds in the command, which will

override the hello time value calculated by the device based on the network

diameter. Generally, we recommend that you use the values of the other two

timers calculated by the device based on the specified network diameter.

The configured network diameter and hello time settings are effective only for

spanning tree instance 0, namely the CIST. If you configure these two timers for

any other instance, your configuration can succeed, but they will not actually work.

# Define the current device as the root bridge of spanning tree instance 0 and set the

network diameter to 4 and the hello time of the device to 500 centiseconds.

<Sysname> system-view

[Sysname] stp instance 0 root primary bridge-diameter 4 hello-time 500

1.1.33 stp root secondary

stp [ instance instance-id ] root secondary [ bridge-diameter bridge-number ]

[ hello-time centi-seconds ]

undo stp [ instance instance-id ] root

Chapter 1 MSTP Configuration Commands

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