Stp Cost - H3C S7500E Series Command Manual

Hide thumbs Also See for S7500E Series:

Table of Contents

Command Manual – MSTP

H3C S7500E Series Ethernet Switches

1.1.19 stp cost

stp [ instance instance-id ] cost cost

undo stp [ instance instance-id ] cost

Ethernet interface view, port group view

instance instance-id: Sets the path cost of the port(s) in a particular spanning tree

instance. The effective range of instance-id is 0 to 31, with 0 representing the CIST.

cost: Path cost of the port, the effective range of which depends on the path cost

calculation standard adopted.

Use the stp cost command to set the path cost of the port(s) in the specified spanning

tree instance or all spanning tree instances.

Use the undo stp cost command to restore the system default.

By default, the device automatically calculates the path costs of ports in each spanning

tree instance based on the corresponding standard.

Configured in Ethernet interface view, the setting is effective on the current port only;

configured in port group view, the setting is effective on all ports in the port group.

If you set instance-id to 0, you are setting the path cost of the port in the CIST. The path

cost setting of a port can affect the role selection of the port. Setting different path costs

for the same port in different spanning tree instances allows different VLAN traffic flows

to be forwarded along different physical links, thus to enable per-VLAN load balancing.

When the path cost of a port is changed, MSTP will re-compute the role of the port and

initiate a state transition.

If you do not provide instance instance-id, your configuration will take effect in the CIST

instance only.

# Set the path cost of port GigabitEthernet 2/0/1 in spanning tree instance 2 to 200.

<Sysname> system-view

[Sysname] interface GigabitEthernet 2/0/1

[Sysname-GigabitEthernet2/0/1] stp instance 2 cost 200

Chapter 1 MSTP Configuration Commands

Table of Contents