H3C S7500E Series Command Manual page 239

Command Manual – MSTP
H3C S7500E Series Ethernet Switches
You cannot map the same VLAN to different spanning tree instances. If you map a
VLAN that has been mapped to an instance to a new instance, the old mapping will be
automatically removed.
Note:
By using the vlan-mapping modulo command, you can quickly specify a VLAN for
each spanning tree instance. This command maps each VLAN to the spanning tree
instance whose ID is (VLAN ID–1) %modulo + 1, where (VLAN ID-1) %modulo is the
modulo operation for (VLAN ID–1). If the modulo value is 16, for example, then VLAN 1
will be mapped to MSTI 1, VLAN 2 to MSTI 2, VLAN 16 to MSTI 16, VLAN 17 to MSTI 1,
and so on.
Related commands: region-name, revision-level, check region-configuration,
active region-configuration.
Examples
# Map VLANs to MSTIs as per modulo 16.
<Sysname> system-view
[Sysname] stp region-configuration
[Sysname-mst-region] vlan-mapping modulo 16
Chapter 1 MSTP Configuration Commands
1-40