Operation Manual – MSTP
H3C S3610&S5510 Series Ethernet Switches
Chapter 1 MSTP Configuration
1-21
The configuration of MST region–related parameters, especially the VLAN-to-instance
mapping table, will cause MSTP to launch a new spanning tree calculation process,
which may result in network topology instability. To reduce the possibility of topology
instability caused by configuration, MSTP will not immediately launch a new spanning
tree calculation process when processing MST region–related configurations; instead,
such configurations will take effect only if you:
z
activate the MST region–related parameters using the
active
region-configuration
command, or
z
enable MSTP using the
stp enable
command.
II. Configuration example
# Configure the MST region name to be “info”, the MSTP revision level to be 1, and
VLAN 2 through VLAN 10 to be mapped to instance 1 and VLAN 20 through VLAN 30
to instance 2.
<Sysname> system-view
[Sysname] stp region-configuration
[Sysname-mst-region] region-name info
[Sysname-mst-region] instance 1 vlan 2 to 10
[Sysname-mst-region] instance 2 vlan 20 to 30
[Sysname-mst-region] revision-level 1
[Sysname-mst-region] active region-configuration
1.3.2 Specifying the Root Bridge or a Secondary Root Bridge
MSTP can determine the root bridge of a spanning tree through MSTP calculation.
Alternatively, you can specify the current device as the root bridge using the commands
provided by the system.
I. Specifying the current device as the root bridge of a specific spanning tree
Follow these steps to specify the current device as the root bridge of a specific
spanning tree:
To do...
Use the command...
Remarks
Enter system view
system-view
—
Specify the current
device as the root
bridge of a specific
spanning tree
stp
[
instance instance-id
]
root primary
[
bridge-diameter
bridge-number
] [
hello-time
centi-seconds
]
Required
By default, a device does
not function as the root
bridge.
