Stp Root-Protection - Huawei Quidway S2000 Series Command Manual

Command Manual - STP
Quidway S2000 Series Ethernet Switches
After a switch is configured as primary root switch or secondary root switch, user can't
modify the bridge priority of the switch.
Example
# Designate the current switch as a secondary root of the STP.
[Quidway] stp root secondary

1.1.15 stp root-protection

Syntax
stp root-protection
undo stp root-protection
View
Ethernet port view
Parameter
None
Description
Using stp root-protection command, you can enable Root protection function on a
switch. Using undo stp root-protection command, you can restore the default status
of Root protection function.
By default, Root protection is not enabled.
Due to configuration error of the maintenance personnel or malicious user attack, a
legal root of the network may receive a BPDU with higher priority and lose its status as
a root, which causes unpleasant changes of network topology. Such illegal changes
may pull the higher-speed traffic to lower-speed links and cause network congestion.
To avoid such problem, RSTP provides Root protection function. After being
configured with Root protection, a port always stays as a designated port. Once such
port receives a BPDU with higher priority, it turns to listening status and will not forward
any packets (as if the link to it is disconnected). It will resume normal status if it
receives no BPDU with higher-priority for a period of time.
Example
# Enable Root protection function on Ethernet0/1 of the switch.
[Quidway-Ethernet0/1] stp root-protection
Chapter 1 RSTP Configuration Commands
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