Configuring Mst Instance Parameters - HP 3500 Series Advanced Traffic Management Manual

Configuring MST Instance Parameters

When you enable MSTP on the switch, a spanning tree instance is enabled
automatically. The switch supports up to sixteen configurable MST instances
for each VLAN group that you want to operate as an active topology within
the region to which the switch belongs. When creating an instance, you must
include a minimum of one VID. You can add more VIDs later if desired.
Command
[no] spanning-tree instance < 1..16 > vlan < vid> [ vid..vid ]
no spanning-tree instance < 1..16 >
spanning-tree instance < 1..16 > priority < 0..15 >
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: Starting in software release 13.x.x, you can enter the
spanning-tree instance vlan command before a static or
dynamic VLAN is configured on the switch to preconfigure
VLAN ID-to-MSTI mappings. No error message is displayed.
Later, each newly configured VLAN that has already been
associated with an MSTI is automatically assigned to the
MSTI.
This new default behavior differs from automatically
including configured (static and dynamic) VLANs in the IST
instance and requiring you to manually assign individual
static VLANs to an MSTI.
Multiple Instance Spanning-Tree Operation
Configuring MSTP
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