H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 82)

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Configuring edge ports
If a port directly connects to a user terminal rather than another device or a shared LAN segment, this
port is regarded as an edge port. When a network topology change occurs, an edge port does not
cause a temporary loop. Because a device does not know whether a port is directly connected to a
terminal, you need to manually configure the port to be an edge port. After that, this port can transition
rapidly from blocked state to forwarding state without delay.
To specify a port or a group of ports as edge port or ports:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view or port group view.
• Enter Ethernet interface
view:
interface interface-type
interface-number
• Enter port group view:
port-group manual
port-group-name
Use either command.
3. Configure the current ports as edge
ports.
stp edged-port enable
All ports are non-edge ports
by default.
NOTE:
•
With BPDU guard disabled, when a port set as an edge port receives a BPDU from another port, it
becomes a non-edge port again. 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 fast and ensures network security.
• Among loop guard, root guard and edge port settings, only one function (whichever is configured the
earliest) can take effect 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.
The device can automatically calculate the default path cost; alternatively, you can also configure the
path cost for ports.
Specifying a standard that the device uses when calculating 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.