R0106-HP MSR Router Series Layer 2 - LAN Switching Command Reference(V7)

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Views
Layer 2 Ethernet interface view
Predefined user roles
network-admin
Parameters
instance instance-list: Sets the path cost of the port in the MSTIs that are specified by an instance list. They
are 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.
vlan vlan-id-list: Sets the path cost of the port in the VLANs specified by a VLAN ID list. They are in the
format of vlan-id-list = { vlan-id [ to vlan-id ] }&<1-10>, where &<1-10> indicates that you can specify up
to 10 vlan-id [ to vlan-id ] parameters. The value range for the vlan-id argument is 1 to 4094.
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. This 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 the interface.
If you do not specify any MSTI or VLAN, this command sets the path cost of the port in the MSTP CIST or
in the STP or RSTP spanning tree.
Examples
# In MSTP mode, set the path cost of port GigabitEthernet 2/1/3 in MSTI 2 to 200.
<Sysname> system-view
[Sysname] interface gigabitethernet 2/1/3
[Sysname-GigabitEthernet2/1/3] stp instance 2 cost 200
# In PVST mode, set the path cost of port GigabitEthernet 2/1/3 in VLAN 2 to 200.
<Sysname> system-view
[Sysname] interface gigabitethernet 2/1/3
[Sysname-GigabitEthernet2/1/3] stp vlan 2 cost 200
Related commands
• display stp
• stp pathcost-standard