Configuring the maximum port rate, Configuration guidelines, Configuration procedure – H3C Technologies H3C S12500 Series Switches User Manual
Page 91: Configuring edge ports, Configuration restrictions and guidelines
78
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Configure the timeout factor of the switch. stp timer-factor factor
The default setting is 3.
Configuring the maximum port rate
The maximum rate of a port refers to the maximum number of BPDUs the port can send within each hello
time. The maximum rate of a port is related to the physical status of the port and the network structure.
Configuration guidelines
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 spanning tree protocols from using excessive network resources
when the network becomes instable. H3C recommends you to use the default setting.
Configuration procedure
To configure the maximum rate of a port or a group of ports:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter interface view or
port group view.
•
Enter Ethernet interface view or Layer 2
aggregate interface view:
interface interface-type interface-number
•
Enter port group view:
port-group manual port-group-name
Use either command.
3.
Configure the maximum
rate of the ports.
stp transmit-limit limit
The default setting is 10.
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 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 must manually configure the port to be an edge port. After that, this port can transit rapidly from the
blocked state to the forwarding state without delay.
Configuration restrictions and guidelines
•
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.