115
Link speed Port type
Path cost
IEEE
802.1d-1998
IEEE 802.1t
Private
standard
Aggregate interface
containing three Selected
ports
166 1
Aggregate interface
containing four Selected
ports
125 1
100 Gbps
Single port
1
200 1
Aggregate interface
containing two Selected
ports
100 1
Aggregate interface
containing three Selected
ports
66 1
Aggregate interface
containing four Selected
ports
50 1
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 Command Remarks
1. Enter system view.
system-view
N/A
2. Enter Layer 2 Ethernet
interface or Layer 2
aggregate interface view.
interface
interface-type
interface-number
N/A
3. Configure the path cost of
the ports.
• In STP/RSTP mode:
stp cost cost-value
• In PVST mode:
stp vlan vlan-id-list cost cost-value
• In MSTP mode:
stp [ instance instance-list ] cost
cost-value
By default, the system
automatically calculates
the path cost of each port.
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 Ten-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.
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