Stp Cost - HP 3100 v2 Series Command Reference Manual

<Sysname> system-view
[Sysname] interface ethernet 1/0/1
[Sysname-Ethernet1/0/1] stp config-digest-snooping
[Sysname-Ethernet1/0/1] quit
[Sysname] stp config-digest-snooping

stp cost

Syntax
stp [ instance instance-id | vlan vlan-list ] cost cost
undo stp [ instance instance-id | vlan vlan-list ] cost
View
Ethernet interface view, port group view, Layer 2 aggregate interface view
Default level
2: System level
Parameters
instance instance-id: Sets the path cost of the ports in a particular MSTI. The value of instance-id
ranges from 0 to 16, where 0 represents the CIST.
vlan vlan-list: Specifies a VLAN list in the format of vlan-list = { vlan-id [ to vlan-id ] }&<1-10>, where
the vlan-id argument represents the VLAN ID, in the range of 1 to 4094, and &<1-10> indicates that
you can specify up to 10 VLAN IDs or VLAN ID ranges.
cost: Specifies the path cost of the port, with an effective range that depends on the path cost
calculation standard adopted.
•
With the IEEE 802.1d-1998 standard selected for path cost calculation, the cost argument
ranges from 1 to 65535.
•
With the IEEE 802.1t standard selected for path cost calculation, the cost argument ranges
from 1 to 200000000.
•
With the private standard selected for path cost calculation, the cost argument ranges from 1 to
200000.
Description
Use stp cost to set the path cost of the port or ports.
Use undo stp cost to restore the default.
By default, the device automatically calculates the path costs of ports in each spanning tree based
on the corresponding standard.
Configured in Ethernet interface view, the setting takes effect only on the interface.
Configured in port group view, the setting takes effect on all ports in the port group.
Configured in Layer 2 aggregate interface view, the setting takes effect only on the aggregate
interface. Configured on a member port in an aggregation group, the setting takes effect only after
the port leaves the aggregation group.
To set the path cost of an MSTP port in a specific MSTI, use this command with the MSTI specified.
To set the path cost of a PVST port in a specific VLAN, use this command with the VLAN specified.
To set the path cost of an MSTP port in the CIST or an STP/RSTP port, use this command without
specifying any MSTI and VLAN.
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.
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