Spanning-Tree Mst Instance Path-Cost - Allied Telesis AT-AR3050S Command Reference Manual

S T C
PANNING REE OMMANDS
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SPANNING TREE MST INSTANCE PATH

spanning-tree mst instance path-cost

Overview Use this command in Interface Configuration mode for a switch port interface only
to set the cost of a path associated with a switch port, for the specified MSTI
(Multiple Spanning Tree Instance) identifier.
This specifies the switch port's contribution to the cost of a path to the MSTI
regional root via that port. This applies when the port is the root port for the MSTI.
Use the no variant of this command to restore the default cost value of the path.
spanning-tree mst instance <instance-id> path-cost <path-cost>
Syntax
no spanning-tree mst instance <instance-id> path-cost
Default The default path cost values and the range of recommended path cost values
depend on the port speed, as shown in the following table from the IEEE
802.1q-2003 standard.
Mode Interface Configuration mode for a switch port interface only.
Usage Before you can use this command to set a path-cost in a VLAN configuration, you
must explicitly add an MST instance to a port using the spanning-tree instance
command.
C613-50077-01 REV A
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COST
Parameter Description
<instance-id>
Specify the MSTI identifier in the range <1-15>.
<path-cost>
Specify the cost of path in the range of <1-200000000>, where
a lower path-cost indicates a greater likelihood of the specific
interface becoming a root.
Port speed
Less than 100 Kb/s
1Mbps
10Mbps
100 Mbps
1 Gbps
10 Gbps
100 Gbps
1Tbps
10 Tbps
Command Reference for AT-AR3050S
AlliedWare Plus™ Operating System - Version 5.4.5-2.x
Default path cost Recommended path cost range
200,000,000 20,000,000-200,000,000
20,000,000 2,000,000-20,000,000
2,000,000 200,000-2,000,000
200,000 20,000-200,000
20,000 2,000-20,000
2,000 200-2, 000
200 20-200
20 2-200
2 2-20
499