R211x-HP Flexfabric 11900 Layer 2 - LAN Switching Command Reference

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Parameters
instance instance-list: Sets the path cost of the port 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 value range for the instance-id argument is 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 value range for the
cost argument is 1 to 65535.
• When the IEEE 802.1t standard is selected for path cost calculation, the value range for the cost
argument is 1 to 200000000.
• When the private standard is selected for path cost calculation, the value range for the cost
argument is 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.
When the setting is configured in Layer 2 Ethernet interface view, it takes effect on only that interface.
When the setting is configured in Layer 2 aggregate interface view, it takes effect on only the aggregate
interface.
When the setting is configured on a member port in an aggregation group, is takes effect only after the
port leaves the aggregation group.
Examples
# In MSTP mode, set the path cost of port Ten-GigabitEthernet 1/0/3 in MSTI 2 to 200.
<Sysname> system-view
[Sysname] interface ten-gigabitethernet 1/0/3
[Sysname-Ten-GigabitEthernet1/0/3] stp instance 2 cost 200
Related commands
• display stp
• stp pathcost-standard
stp edged-port
Use stp edged-port to configure a port as an edge port.
Use undo stp edged-port to configure a port as a non-edge port.
Syntax
stp edged-port
undo stp edged-port
Default
All ports are non-edge ports.