HP MSR2000/3000/4000 Router Series Layer 2 - LAN Switching Configuration Guide

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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.
The higher the maximum port rate, the more BPDUs are sent within each hello time, and the more system
resources are 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 unstable. HP recommends using the default setting.
To configure the maximum rate of a port:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter Layer 2 Ethernet
interface view.
interface interface-type interface-number N/A
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 determine whether a port is directly connected to a
terminal, you must manually configure the port as an edge port. After that, the port can rapidly transit
from the blocked state to the forwarding state.
Configuration restrictions and guidelines
• If BPDU guard is disabled, a port set as an edge port becomes 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 quickly transit to the forwarding state when ensuring network security.
• On a port, the loop guard function and the edge port setting are mutually exclusive.
Configuration procedure
To specify a port as an edge port:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter Layer 2 Ethernet
interface view.
interface interface-type interface-number N/A
3. Configure the current ports as
edge ports.
stp edged-port
By default, all ports are
non-edge ports.