3Com MSR 50, MSR 30 manual Examples # Map VLANs to MSTIs as per the modulo value, 629

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Description Use the vlan-mapping modulo command to map VLANs in the current MST region to MST instances according to the specified modulo value.

By default, all VLANs are mapped to the CIST (instance 0).

You cannot map the same VLAN to different MST instances. If you map a VLAN that has been mapped to an instance to a new instance, the old mapping will be automatically removed.

n By using the vlan-mapping modulo command, you can quickly specify a VLAN for each MST instance. This command maps each VLAN to the MST 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 15, for example, then VLAN 1 will be mapped to MSTI 1, VLAN 2 to MSTI 2, VLAN 16 to MSTI 1, VLAN 17 to MSTI 2, and so on.

Related commands: region-name,revision-level,check region-configuration, and active region-configuration.

Examples # Map VLANs to MSTIs as per the modulo value of 8.

<Sysname> system-view

[Sysname] stp region-configuration

[Sysname-mst-region] vlan-mapping modulo 8