Configuring Path Costs Of Ports - HP 3600 v2 series Configuration Manual

NOTE:
If BPDU guard is disabled, a port set as an edge port will become a non-edge port again if it receives
•
a BPDU from another port. To restore the edge port, re-enable it.
• If a port directly connects to a user terminal, configure it as an edge port and enable BPDU guard for it.
This enables the port to transition to the forwarding state quickly while ensuring network security.
You cannot configure edge port settings and loop guard on a port at the same time.
•

Configuring path costs of ports

Path cost is a parameter related to the rate of a port. On a spanning tree device, a port can have different
path costs in different MSTIs. Setting appropriate path costs allows VLAN traffic flows to be forwarded
along different physical links, achieving VLAN-based load balancing.
You can have the device automatically calculate the default path cost, or you can configure the path cost
for ports.
Specifying a standard for the device to use when it calculates the default path cost
You can specify a standard for the device to use in automatic calculation for the default path cost. The
device supports the following standards:
dot1d-1998—The device calculates the default path cost for ports based on IEEE 802.1d- 1 998.
•
• dot1t—The device calculates the default path cost for ports based on IEEE 802.1t.
legacy—The device calculates the default path cost for ports based on a private standard.
•
Follow these steps to specify a standard for the device to use when it calculates the default path cost:
To do...
Enter system view
Specify a standard for the device
to use when it calculates the default
path costs of its ports
CAUTION:
If you change the standard that the device uses to calculate the default path costs, you restore the path
costs to the default.
NOTE:
When it calculates path cost for an aggregate interface, IEEE 802.1t takes into account the number of
Selected ports in its aggregation group, but IEEE 802.1d-1998 does not. The calculation formula of IEEE
802.1t is: Path cost = 200,000,000/link speed (in 100 kbps), where link speed is the sum of the link speed
values of the Selected ports in the aggregation group.
Table 14 Mappings between the link speed and the path cost
Link speed
0
10 Mbps
Use the command...
system-view
stp pathcost-standard
{ dot1d-1998 | dot1t | legacy }
Port type
—
Single port
Path cost
IEEE 802.1d-1998
65535
100
83
Remarks
—
Optional
legacy by default.
IEEE 802.1t Private standard
200,000,000 200,000
2,000,000 2000