3Com MSR 30, MSR 50 manual Display stp abnormal-port, Abnormally blocked ports, Root guard action

600CHAPTER 38: MSTP CONFIGURATION COMMANDS

<Sysname> display stp instance 0 interface Ethernet 1/1 to Ethernet

1/4 GigabitEthernet 1/1 to GigabitEthernet 1/4 brief
MSTID	Port	Role	STP State	Protection
0	Ethernet1/1	ALTE	DISCARDING	LOOP
0	Ethernet1/2	DESI	FORWARDING	NONE
0	Ethernet1/3	DESI	FORWARDING	NONE
0	Ethernet1/4	DESI	FORWARDING	NONE
0	GigabitEthernet1/1	DESI	FORWARDING	NONE
0	GigabitEthernet1/2	DESI	FORWARDING	NONE
0	GigabitEthernet1/3	DESI	FORWARDING	NONE
0	GigabitEthernet1/4*	DESI	FORWARDING	NONE

(*) means port in aggregation group

Table 103 Description on the fields of the display stp command

Field	Description
MSTID	MST instance ID in the MST region
Port	Port name, corresponding to each MST instance
Role	Port role
STP State	MSTP status on the port, including forwarding, discarding, and
	learning
Protection	Protection type on the port, including root guard, loop guard,
	and BPDU guard
(*) means port in aggregation	* indicates a port in an aggregation group
group

display stp abnormal-port

Syntax	display stp abnormal-port
View	Any view
Parameters	None
Description	Use the display stp abnormal-portcommand to view the information about
	abnormally blocked ports.
	Any of the following reasons may cause a port to be abnormally blocked:
	■	Root guard action
	■	Loop guard action

■ MSTP BPDU format compatibility protection action

Examples # View information about abnormally blocked ports.

<Sysname>	display stp abnormal-port
MSTID	Blocked Port	Reason
1	Ethernet1/0	ROOT-Protected
2	Ethernet1/1	LOOP-Protected
2	Ethernet1/2	Formatcompatibility-Protected