H3C S7500 Series Ethernet Switches Command Manual

Command Manual – MSTP
H3C S7500 Series Ethernet Switches Chapter 1
MSTP Configuration Commands
1-38
[H3C-mst-region]
1.1.36 stp root primary
Syntax
stp [ instance instance-id ] root primary [ bridge-diameter bridgenum ] [ hello-time
centi-seconds ]
undo stp [ instance instance-id ] root
View
System view
Parameters
instance-id: MSTI ID ranging from 0 to 16. A value of 0 specifies the CIST.
bridgenum: Network diameter of the specified MSTI. This argument ranges from 2 to 7
and defaults to 7.
centi-seconds: Hello time (in centiseconds) of the specified MSTI. This argument
ranges from 100 to 1,000 and defaults to 200.
Description
Use the stp root primary command to configure the current switch as the root bridge
of a specified MSTI.
Use the undo stp root command to cancel the current configuration.
By default, a switch is not configured as a root bridge.
If you do not specify the instance-id argument, these two commands apply to the CIST.
You can specify the current switch as the root bridge of an MSTI regardless of the
priority of the switch. You can also specify the network diameter of the switched
network by using the stp root primary command. The switch will then figure out the
following three time parameters: Hello time, Forward delay, and Max age. As the Hello
time figured out by the network diameter is not always the optimal one, you can set it
manually through the hello-time centi-seconds parameter. Normally, you are
recommended to set the network diameter and leave the Forward delay and Max age
parameters being automatically determined by the network diameter you set.