Spanning-Tree Operation
802.1s Multiple Spanning Tree Protocol (MSTP)
priority < 0..15 >
MSTP uses this parameter to determine the port(s) to use
for forwarding. The port with the lowest priority number
has the highest priority. The range is 0 to 240, and is
configured by specifying a multiplier in the range of 0 -
15. For example, to enter a priority of 64 you would
configure Priority with a multiplier of 4; that is, (4 x 16
= 64). Thus, the displayed default setting of 128 is derived
from the default multiplier of 8. When you use the show
spanning-tree command options, the Priority appears as
the result of the multiplier x 16, and not the multiplier
itself. (Default: 128; configured multiplier = 8).
Configuring MST Instance Parameters
Command Page
spanning-tree instance < 1..16 > vlan < vid> [ vid..vid ] 6-61
no spanning-tree instance < 1..16 >
spanning-tree instance < 1..16 > priority < 0..15 > 6-63
spanning-tree priority < 0..15 > 6-64
Syntax: 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 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. At least one VLAN must be mapped to a
MSTI when you create it. (A VLAN cannot be mapped to more
than one instance at a time.) You can create up to 16 MSTIs
in a region. Use the no form of the command to remove a VLAN
from an MSTI. (Removing a VLAN from an MSTI returns the
VLAN to the IST instance, where it can either remain or be re-
assigned to another MSTI configured in the region.)
The no form of the command deletes the specified MSTI and
returns all VLAN assignments to the region’s IST instance.
6-63
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