Vlan-Mapping Modulo - HP 12500 Series Command Reference Manual

When the setting is configured in Layer 2 aggregate interface view, it takes effect on only the
aggregate interface.
When the setting is configured on a member port in an aggregation group, it takes effect only after
the port leaves the aggregation group.
Examples
# Set the maximum transmission rate of port GigabitEthernet 3/0/1 to 5.
<Sysname> system-view
[Sysname] interface GigabitEthernet 3/0/1
[Sysname-GigabitEthernet3/0/1] stp transmit-limit 5

vlan-mapping modulo

Use vlan-mapping modulo to map VLANs in the 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: Sets the modulo value in the range of 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 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 15, then VLAN 1
is mapped to MSTI 1, VLAN 2 to MSTI 2, ..., VLAN 15 to MSTI 15, VLAN 16 to MSTI 1, 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
•
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