3Com Switch 4800G 24-Port Configuration Manual page 214

214 C 23: MSTP C
HAPTER
n
ONFIGURATION
To do...
Configure the
VLAN-to-instance
mapping table
Configure the MSTP
revision level of the MST
region
Activate MST region
configuration manually
Display all the
configuration information
of the MST region
Display the currently
effective MST region
configuration information
MSTP-enabled switches are in the same region only when they have the same
■
format selector (a 802.1s-defined protocol selector, which is 0 by default and
cannot be configured), MST region name, VLAN-to-MSTI mapping table, and
revision level.
The 3Com series support only the MST region name, VLAN-to-MSTI mapping
■
table, and revision level. Switches with the settings of these parameters being
the same are assigned to the same MST region.
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:
activate the MST region-related parameters using the active
■
region-configuration command, or
enable MSTP using the stp enable command.
■
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
Use the command...
instance instance-id vlan vlan-list
vlan-mapping modulo modulo
revision-level level
active region-configuration
check region-configuration
display stp region-configuration
Remarks
Optional
Use either command.
All VLANs in an MST region
are mapped to MST
instance 0 by default.
Optional
0 by default
Required
Optional
The display command can
be executed in any view.