Stp Interface Root-Protection - 3Com 8807 Command Reference Manual

192 C 13: MSTP C C
HAPTER ONFIGURATION OMMANDS
This configuration takes effect on the CIST and all the MSTIs. The settings of a port
whether to connect the point-to-point link will be applied to all the MSTIs where
the port belongs. Note that a temporary loop may be redistributed if you configure
a port not physically connected with the point-to-point link as connected to such a
link by force.
Related command: stp point-to-point.
Example
# Configure Ethernet2/1/3 to be connected to the point-to-point link.
<SW8800>system-view
System View: return to User View with Ctrl+Z.
[SW8800] stp interface Ethernet2/1/3 point-to-point force-true
stp interface Syntax
root-protection
stp interface interface-list root-protection
undo stp interface interface-list root-protection
View
System view
Parameter
interface-list: Ethernet port list, containing multiple Ethernet ports and expressed
as interface-list = { interface-type interface-number [ to interface-type
interface-number ] }&<1-10>. For detail descriptions of interface-type and
interface-number parameters, refer to the corresponding descriptions in Port
Command Manual. &<1-10> means that the preceding parameters can be
entered up to 10 times.
Description
Use the stp interface root-protection command to enable Root protection on
the switch in system view.
Use the undo stp interface root-protection command to 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). So, Root protection takes effect
only when it is enabled on a designated port. If the port has not received any