display loop-detect eth-loop

Function

The display loop-detect eth-loop command displays configurations of MAC flapping-based loop detection and information about the blocked interface or pseudo wire (PW).

Format

display loop-detect eth-loop [ vsi vsi-name ]

display loop-detect eth-loop bridge-domain bd-id

display loop-detect eth-loop vlan vlan-id

Parameters

Parameter	Description	Value
vsi vsi-name	Displays configurations of MAC flapping-based loop detection in a specified VSI.If vsi vsi-name is not specified, the command displays configurations of MAC flapping-based loop detection in all VSIs.	The value is a string of 1 to 31 case-sensitive characters, spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string.
bridge-domain bd-id	Specifies a BD ID.	The value is an integer ranging from 1 to 16777215.
vlan vlan-id	Specifies the ID of a VLAN for which configuration information of MAC flapping-based loop detection is to be displayed.	The value is an integer ranging from 1 to 4094.

Parameter

Description

Value

vsi vsi-name

Displays configurations of MAC flapping-based loop detection in a specified VSI.If vsi vsi-name is not specified, the command displays configurations of MAC flapping-based loop detection in all VSIs.

The value is a string of 1 to 31 case-sensitive characters, spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string.

bridge-domain bd-id

Specifies a BD ID.

The value is an integer ranging from 1 to 16777215.

vlan vlan-id

Specifies the ID of a VLAN for which configuration information of MAC flapping-based loop detection is to be displayed.

The value is an integer ranging from 1 to 4094.

Views

All views

Default Level

1: Monitoring level

Task Name and Operations

Task Name	Operations
mflp	read

Usage Guidelines

Usage Scenario

After configuring MAC flapping-based loop detection , run the display loop-detect eth-loop command to view the configurations and the blocked interface or PW. The command output helps you diagnose faults.

Example

The actual command output varies according to the device. The command output here is only an example.

# Display configurations of MAC flapping-based loop detection in all BDs.

<HUAWEI> display loop-detect eth-loop
BD     LTimes    DCycle      Cycles   Retry     Action              
------------------------------------------------------------------------------
1                3         3           1        0         Block 0 s           
                                                                                
Total Items = 1 
                                                                               
Blocked Port:
---------------
                                                                               
BD               Block Port            Link-Block Port       Detect MAC        T
--------------------------------------------------------------------------------
1                Eth-Trunk9.1(P)                             00e0-fc12-3457    0
1                Eth-Trunk9.2(P,B)                          00e0-fc12-3458    0

**Table 1** Description of the **display loop-detect eth-loop** command output
Item	Description
BD	Name of a VSI, a VLAN or a BD in which MAC flapping-based loop detection is enabled.
LTimes	Number of MAC address entry flaps, which can be configured using the loop-detect eth-loop command.
DCycle	Detection cycle, which can be configured using the loop-detect eth-loop command.
Cycles	Number of detection cycles. If loops occur within the consecutive detection cycles, an interface or PW is blocked, or an alarm is reported. This parameter can be configured using the loop-detect eth-loop command.
Retry	Number of times that loops are allowed to occur after a blocked interface or PW recovers. If this number is exceeded, the interface or PW is blocked permanently. This parameter can be configured using the loop-detect eth-loop command.
Action	Action taken after a loop is detected. It can be keeping an interface or a PW blocked for a specified period of time or just recording a log and reporting an alarm to the NMS. This parameter can be configured using the loop-detect eth-loop command.
Block Port	Blocked interface or PW. (P) in the command output indicates permanent blocking, (B) in the command output indicates blocking caused by dynamic black-hole MAC address entries.
Total Items	Number of VSIs, VLANs or BDs in which MAC flapping-based loop detection is enabled.
Blocked Port	Blocked interface or PW.
Link-Block Port	Associated interface that is blocked. This field is displayed only after MAC flapping-based loop detection association is enabled using the monitor mac-shift command.
Detect MAC	MAC address that flaps.
T	Whether accurate blocking is applied. 1: yes. 0: no.