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Command Manual - STP
Quidway S3500 Series Ethernet Switches
Chapter 1 MSTP Configuration Commands
Huawei Technologies Proprietary
1-25
Description
Using stp interface root-protection command, you can enable Root protection on the
switch in system view. Using undo stp interface root-protection command, you can
restore the default Root protection state.
By default, Root protection is disabled.
In case of configuration error or malicious attack, the legal primary root may receive the
BPDU with a higher priority and then loose its place, which causes network topology
change errors. Due to the illegal change, the traffic supposed to travel over the
high-speed link may be pulled to the low-speed link and congestion will occur on the
network.
Root protection function is used against such problem. The port configured with Root
protection only plays a role of designated port on every instance. Whenever such port
receives a higher-priority BPDU, that is, it is about to turn into non-designated port, it
will be set to listening state and not forward packets any more (as if the link to the port is
disconnected). If the port has not received any higher-priority BPDU for a certain period
of time thereafter, it will resume the normal state.
For the related command, see stp root-protection .
Example
# Enable Root protection on the Ethernet 0/1.
[Quidway] stp interface ethernet 0/1root-protection
1.1.26 stp interface transit-limit
Syntax
stp interface interface-list transit-limit packetnum
undo stp interface interface-list transit-limit
View
System view
Parameter
interface-list : Ethernet port list, containing multiple Ethernet ports and expressed as
interface _list = { { interface_type interface_num | interface_name } [ to { interface_type
interface_num | interface_name } ] }&<1-10>. For detail descriptions of interface_type ,
interface_num and interface_name parameters, refer to the corresponding descriptions
in Port Command Manual. &<1-10> means that the preceding parameters can be
entered up to 10 times.