H3C Technologies H3C S10500 Series Switches - Manual (Page 95)

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terminal, you must manually configure the port as an edge port. After that, the port can transition rapidly
from the blocked state to the forwarding state.
Follow these steps to specify a port or a group of ports as edge port or ports:
To do... Use the command... Remarks
Enter system view system-view —
Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view
interface
interface-type
interface-number
Enter
interface
view or port
group view
Enter port group view
port-group manual
port-group-name
Required
Use either command.
Configure the current ports as edge ports stp edged-port enable
Required
All ports are non-edge ports by default.
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-1998.
• 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... Use the command... Remarks
Enter system view system-view —
Specify a standard for the device
to use when it calculates the default
path costs of its ports
stp pathcost-standard
{ dot1d-1998 | dot1t | legacy } Optional
legacy by default.
CAUTION:
If you change the standard that the device uses to calculate the default path costs, you restore the path
costs to the default.