Periodic Loopback Detection

Periodic loopback detection based on VLAN IDs can detect looped E-LAN services.

Navigation Path

In the NE Explorer, choose Configuration > Packet Configuration > Ethernet Service Management > E-LAN Service from the navigation tree. Then click the Periodic Loopback Detection tab.

For RTN NEs, in the NE Explorer, choose Configuration > Ethernet Service Management > E-LAN Service from the navigation tree. Then click the Periodic Loopback Detection tab.

Button Description

Button	Description
Start	Starts periodic loopback detection for a port.
Stop	Stops periodic loopback detection for a port.

Parameter Description

**Table 1** Parameters required for configuring periodic loopback detection
Parameter	Value	Description
Logical Port	For example: slot ID-board name-port ID (port name)	Indicates the logical port where periodical loopback detection is initiated.
VLANs/CVLAN	For example: 231	Indicates the VLAN ID of the service for which periodic loopback detection is performed. This parameter can be set to null, a number, or several numbers. When setting this parameter to several numbers, use the comma (,) to separate the discrete numbers, or use the en dash (-) to represent a consecutive number. For example, the numbers 1, and 3-6 indicate 1, 3, 4, 5, and 6. NOTE: If this parameter is left blank, loopback can be performed on VLAN-free services.
Detection Interval(s)	For example: 60	Indicates the interval at which periodic loopback detection starts.
Shut Down Services upon Loopback	Yes, No Default: No.	Specifies whether to shut down a service immediately after finding that it is looped. CAUTION: Shutting down looped services causes service interruption.
Detection Status	Started, Stopped	Displays the status of periodic loopback detection. If Detection Status is Stopped, you can click Start to start periodic loopback detection when necessary. If Detection Status is Started, you can click Stop to stop periodic loopback detection when necessary.
Detection Result	For example: VLAN:231, Noloopback, Not shut	Displays the results of periodic loopback detection. VLAN:231, Noloopback, Not shut indicates that the service whose VLAN ID is 231 is not looped or shut down.