H3C S9500 Series Operation Manual page 698

Operation Manual – STP
H3C S9500 Series Routing Switches
A user manually activates the configured parameters related to the MST region,
using the active region-configuration command.
A user enables MSTP using the stp enable command.
By default, the MST region name is the switch MAC address, all the VLANs in the MST
region are mapped to the STI 0, and the MSTP region revision level is 0. You can
restore the default settings of MST region, using the undo stp region-configuration
command in system view.
III. Configuring the mapping relationship between a VLAN list and a Spanning
Tree Instance
MSTP describes the mapping relationship between VLAN and Spanning Tree
instances through the VLAN mapping table. You can use this command to configure the
VLAN mapping table: each VLAN can be allocated to different Spanning Tree instances
according to your configuration.
You cannot map one VLAN to different instances. When you map a mapped VLAN to a
different MSTI, the previous mapping relationship will be automatically cancelled.
The vlan-mapping modulo modulo command can specify a VLAN to each Spanning
Tree instance quickly. This command maps a VLAN to the Spanning Tree instance
whose ID is (VLAN ID-1) %modulo+1. (Note: (VLAN ID-1) %modulo is the modulo
operation for (VLAN ID-1). If the modulo operation is based on 16, VLAN 1 is mapped to
MSTI 1, VLAN 2 is mapped to MSTI 2...VLAN 16 is mapped to MSTI 16, VLAN 17 is
mapped to VLAN 17, and so on.)
Perform the following configurations in MST region view.
Table 1-3 Map all the VLAN lists to the specific Spanning Tree instances
Map all the VLAN lists to the specific Spanning Tree
instances uniformly through the modulo operation.
Restore the default mapping relationship between
VLAN lists and Spanning Tree instances.
By default, all the VLAN lists are mapped to CIST, namely, Instance 0.
IV. Activating the MST region configuration, and exit the MST region view
Perform the following configuration in MST region view.
Operation
1-14
Chapter 1 MSTP Region-configuration
Command
vlan-mapping
modulo
undo vlan-mapping
modulo
modulo