Configuring the bpdu transmission rate, Configuring edge ports, Configuration restrictions and guidelines – H3C Technologies H3C S5560 Series Switches User Manual
Page 119: Configuration procedure
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Step Command
Remarks
2.
Configure the timeout factor
of the device.
stp timer-factor factor
The default setting is 3.
Configuring the BPDU transmission rate
The maximum number of BPDUs a port can send within each hello time equals the BPDU transmission
rate plus the hello timer value. Configure an appropriate BPDU transmission rate based on the physical
status of the port and the network structure.
The higher the BPDU transmission rate, the more BPDUs are sent within each hello time, and the more
system resources are used. By setting an appropriate BPDU transmission rate, you can limit the rate at
which the port sends BPDUs. Setting an appropriate rate also prevents spanning tree protocols from
using excessive network resources when the network topology changes. H3C recommends that you use
the default setting.
To configure the BPDU transmission rate:
Step Command Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Layer 2 Ethernet or
aggregate interface view.
interface interface-type interface-number
N/A
3.
Configure the BPDU
transmission 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 configure a port as an edge port: