H3C S5120-SI Series Command Reference Manual page 207

using excessive bandwidth resources during network topology changes. You are recommended to
use the default value.
Examples
# Set the maximum transmission rate of port GigabitEthernet 1/0/1 to 5.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] stp transmit-limit 5
vlan-mapping modulo
Syntax
vlan-mapping modulo modulo
View
MST region view
Default Level
2: System level
Parameters
modulo: Modulo value. The minimum value is 1, and the maximum value is 3.
Description
Use the vlan-mapping modulo command to map VLANs in the current MST region to MSTIs
according to the specified modulo value, thus quickly creating a VLAN-to-instance mapping table.
By default, all VLANs are mapped to the CIST (MSTI 0).
Note that:
You cannot map the same VLAN to different MSTIs. If you map a VLAN that has been mapped to
an MSTI to a new MSTI, the old mapping will be automatically removed.
This command maps each VLAN to the MSTI 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 3, for
example, then VLAN 1 will be mapped to MSTI 1, VLAN 2 to MSTI 2, VLAN 3 to MSTI 3, VLAN 4 to
MSTI 1, and so on.
Related commands: region-name, revision-level, display stp region-configuration, check
region-configuration, active region-configuration.
Examples
# Map VLANs to MSTIs as per modulo 3.
<Sysname> system-view
[Sysname] stp region-configuration
[Sysname-mst-region] vlan-mapping modulo 3
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