Stp Bpdu-Protection; Stp Bridge-Diameter - H3C S3100 Series Command Manual

stp bpdu-protection

Syntax
stp bpdu-protection
undo stp bpdu-protection
View
System view
Parameters
None
Description
Use the stp bpdu-protection command to enable the BPDU guard function on the switch.
Use the undo stp bpdu-protection command to restore to the default state of the BPDU guard
function.
By default, the BPDU guard function is disabled.
Normally, the access ports of the devices operating on the access layer are directly connected to
terminals (such as PCs) or file servers. These ports are usually configured as edge ports to implement
rapid transition. But they resume non-edge ports automatically upon receiving configuration BPDUs,
which causes spanning trees recalculation and network topology jitter.
Normally, no configuration BPDU will reach edge ports. But malicious users can attack a network by
sending configuration BPDUs deliberately to edge ports to cause network jitter. You can prevent such
attacks by enabling the BPDU guard function. With this function enabled on a switch, the switch shuts
down the edge ports that receive configuration BPDUs and then reports these cases to the
administrator. If an edge port is shut down, only the administrator can restore it.
You are recommended to enable BPDU guard for devices with edge ports configured.
Examples
# Enable the BPDU guard function.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] stp bpdu-protection

stp bridge-diameter

Syntax
stp bridge-diameter bridgenum
undo stp bridge-diameter
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