vlan-mapping modulo
Use vlan-mapping modulo to map VLANs in an MST region to MSTIs according to the specified modulo value and quickly create a VLAN-to-instance mapping table.
Syntax
vlan-mapping modulo modulo
Default
All VLANs are mapped to the CIST (MSTI 0).
Views
MST region view
Predefined user roles
network-admin
mdc-admin
Parameters
modulo: Specifies the modulo value. The value range for this argument is 1 to 64.
Usage guidelines
You cannot map a VLAN to different MSTIs. If you map a VLAN that has been mapped to an MSTI to a new MSTI, the old mapping is automatically deleted.
This command maps each VLAN to the MSTI with ID (VLAN ID – 1) % modulo + 1. (VLAN ID – 1) % modulo is the modulo operation for (VLAN ID – 1). If the modulo value is 15, then VLAN 1 is mapped to MSTI 1, VLAN 2 to MSTI 2, …, VLAN 15 to MSTI 15, VLAN 16 to MSTI 16, and so on.
Examples
# Map VLANs to MSTIs as per modulo 8.
<Sysname> system-view [Sysname] stp region-configuration [Sysname-mst-region] vlan-mapping modulo 8
Related commands
active region-configuration
check region-configuration
display stp region-configuration
region-name
revision-level