H3C Technologies H3C S7500E Series Switches - Manual (Page 178)

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The higher the maximum port rate is, the more BPDUs will be sent within each hello time, and the
more system resources will be used. By setting an appropriate maximum port rate, you can limit the
rate at which the port sends BPDUs and prevent MSTP from using excessive network resources when
the network becomes instable. We recommend 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 will 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.
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 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.
With BPDU guard disabled, when a port set as an edge port receives a BPDU from another port, it
will become 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.