Stp Cost - HP 12500 Series Command Reference Manual

[Sysname] interface GigabitEthernet 3/0/1
[Sysname-GigabitEthernet3/0/1] stp config-digest-snooping
[Sysname-GigabitEthernet3/0/1] quit
[Sysname] stp global config-digest-snooping
Related commands
display stp
•
stp global config-digest-snooping
•

stp cost

Use stp cost to set the path cost of the port or ports.
Use undo stp cost to restore the default.
Syntax
stp [ instance instance-list ] cost cost
undo stp [ instance instance-list ] cost
Default
The device automatically calculates the path costs of ports in each spanning tree based on the
corresponding standard.
Views
Layer 2 Ethernet interface view, Layer 2 aggregate interface view
Predefined user roles
network-admin
mdc-admin
Parameters
instance instance-list: Sets the path cost of the ports in the MSTIs that are specified by an instance
list, in the format of instance-list = { instance-id [ to instance-id ] }&<1-10>, where &<1-10>
indicates that you can specify up to 10 instances or instance ranges. The instance-id argument is in
the range of 0 to 4094, and the value 0 represents the CIST.
cost: Specifies the path cost of the port, with an effective range that depends on the path cost
calculation standard that is adopted.
When the IEEE 802.1d-1998 standard is selected for path cost calculation, the cost argument is
•
in the range of 1 to 65535.
When the IEEE 802.1t standard is selected for path cost calculation, the cost argument is in the
•
range of 1 to 200000000.
When the private standard is selected for path cost calculation, the cost argument is in the
•
range of 1 to 200000.
Usage guidelines
Path cost is an important factor in spanning tree calculation. Setting different path costs for a port
in MSTIs allows VLAN traffic flows to be forwarded along different physical links, which results in
VLAN-based load balancing.
The path cost setting of a port can affect the role selection of the port. When the path cost of a
port is changed, the system calculates the role of the port and initiates a state transition.
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