Configuring Path Costs Of Ports; Configuration Example - H3C S7500E-X Configuration Manual

Link speed

Configuring path costs of ports

When the path cost of a port changes, the system recalculates the role of the port and initiates a
state transition.
To configure the path cost of a port:
Step
Enter system view.
1.
Enter Layer 2 Ethernet or
2.
aggregate interface view.
Configure the path cost of
3.
the ports.

Configuration example

# In MSTP mode, perform the following tasks:
•
Configure the device to calculate the default path costs of its ports by using IEEE 802.1d-1998.
•
Set the path cost of GigabitEthernet 1/0/3 to 200 on MSTI 2.
<Sysname> system-view
[Sysname] stp pathcost-standard dot1d-1998
Cost of every port will be reset and automatically re-calculated after you change the
current pathcost standard. Continue?[Y/N]:y
Cost of every port has been re-calculated.
[Sysname] interface gigabitethernet 1/0/3
[Sysname-GigabitEthernet1/0/3] stp instance 2 cost 200
# In PVST mode, perform the following tasks:
•
Configure the device to calculate the default path costs of its ports by using IEEE 802.1d-1998.
•
Set the path cost of GigabitEthernet 1/0/3 to 2000 on VLAN 20 through VLAN 30.
<Sysname> system-view
[Sysname] stp pathcost-standard dot1d-1998
Port type
containing two Selected
ports
Aggregate interface
containing three Selected
ports
Aggregate interface
containing four Selected
ports
Command
system-view
interface interface-type
interface-number
•
In STP/RSTP mode:
stp cost cost
•
In PVST mode:
stp vlan vlan-id-list cost cost
•
In MSTP mode:
stp [ instance instance-list ] cost
cost
Path cost
IEEE
IEEE 802.1t
802.1d-1998
66
50
84
Private
standard
1
1
Remarks
N/A
N/A
By default, the system
automatically calculates
the path cost of each port.