Configuring Ports As Edge Ports; Configuring Path Costs Of Ports - HP A6600 Configuration Manual

the port sends BPDUs and prevent MSTP from using excessive network resources when the network
becomes instable. HP recommends that you use the default setting.

Configuring ports as 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 the
blocked state to the forwarding state without delay.
Make this configuration on the root bridge and on the leaf nodes separately.
To specify a port or a group of ports as edge port or ports:
To do...
1. Enter system view
2. Enter
interface
view or port
group view
3. Configure the current ports as edge ports
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 while ensuring 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

If you change the standard that the device uses in calculating the default path costs, you restore the path
costs to the default.
Path cost is a parameter related to the rate of a port. On an MSTP-enabled 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, thus achieving VLAN-based load balancing.
The device can calculate the default path cost automatically. You also have the option of configuring the
path cost for ports.
Make the following configurations on the leaf nodes only.
Specifying a standard that the device uses when calculating the default path cost
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.
Enter Ethernet interface
view, or Layer 2 aggregate
interface view
Enter port group view
Use the command...
system-view
interface interface-type
interface-number
port-group manual
port-group-name
stp edged-port enable
62
Remarks
—
Required.
Use either command.
Required.
All ports are non-edge ports
by default.