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Multiple Instance Spanning-Tree Operation
Configuring MSTP
Configuring MSTP Instances with the VLAN Range Option
For the switches covered in this guide, if you use the spanning-tree instance
command with the VLAN range option, even if the range includes VLANs that
are not currently present on the switch, the entire range of VLANs is config-
ured. For example, if VLANs 1, 5, and 7 are currently present and you enter
this command:
HP Switch(config)# spanning-tree instance 1 vlan 1-10
then all the VLANs from 1 through 10 are included, even those VLANs that are
not present.
Syntax: [no] spanning-tree instance < 1..16 > vlan < vid [ vid..vid ] >
no spanning-tree instance < 1..16 >
Configuring MSTP on the switch automatically configures the
IST instance and places all statically and dynamically
configured VLANs on the switch into the IST instance. This
command creates a new MST instance (MSTI) and moves the
VLANs you specify from the IST to the MSTI.
You must map at least one VLAN to an MSTI when you create
it. You cannot map a VLAN ID to more than one instance. You
can create up to 16 MSTIs in a region.
The no form of the command removes one or more VLANs from
the specified MSTI. If no VLANs are specified, the no form of
the command deletes the specified MSTI.
When you remove a VLAN from an MSTI, the VLAN returns to
the IST instance, where it can remain or be re-assigned to
another MSTI configured in the region.
Note: The valid VLAN IDs that you can map to a specified
MSTI are from 1 to 4094. The VLAN ID-to-MSTI mapping does
not require a VLAN to be already configured on the switch. The
MSTP VLAN enhancement allows you to preconfigure MSTP
topologies before the VLAN IDs associated with each instance
exist on a switch.
When you use preconfigured VLAN ID-to-MSTI topologies,
ensure that MSTP switches remain in the same region by
mapping all VLAN IDs used in the region to the same MSTIs
on each regional switch.
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