LPT Management

In this interface, you can set and query parameters related to link state pass through (LPT).

Navigation Path

In the NE Explorer, click the NE and choose Configuration > Packet Configuration > LPT Management from the Function Tree.

Buttons

Button	Description
Bind > PW New > PW	The LPT-enabled NEs at both ends of a PSN are provider edges (PEs) that transmit ETH PWE3 services. An LPT packet carries the same PW label as the service that is transmitted over the PSN.
Bind > QinQ New > QinQ	The LPT-enabled NEs at both ends of a QinQ service network push or pop S-VLAN tags. An LPT packet carries the same S-VLAN ID as the service that is transmitted over the QinQ network.

Parameters

**Table 1** Parameters of the Point-to-Point LPT
Field	Value	Description
Binding Status	Unbound, Bound	Displays the binding status.
Primary Function Point	Slot-NE Name	Displays the primary function point.
Secondary Function Point Type	PW	Sets the secondary function point type.
Secondary Function Point	For example: 103	Sets the secondary function point.
LPT Instance Status	Normal, Fault at access side, Fault on service network, Waiting for fault recovery, Recovering from fault	Sets the LPT instance status.
LPT Enabled	Enabled, Disenabled	Sets the LPT enabled status.
Recovery Time (s)	1 to 600	Sets recovery time.
Hold-Off Time (ms)	0 to 10000	After the LPT switching is enabled, the port notifies the peer end of the enabling operation after the hold time expires.
Switching Mode	Strict mode, Non-strict mode	Sets the switching mode of point-to-multipoint LPT. Strict mode: A primary point triggers LPT switching when all its secondary points detect faults. Non-strict mode: A primary point triggers LPT switching when anyone of its secondary points detects a fault. NOTE: Point-to-point LPT is available only in strict mode.
Fault Detection Mode	LPT OAM, PW OAM	Sets the fault detection mode of LPT. LPT-enabled NEs periodically transmit LPT OAM packets in specific formats to check the status of an L2 service network or QinQ service network. If the LPT OAM packets are absent for 3.5 fault detection periods or the number and contents of received LPT OAM packets are incorrect, the NEs consider that a network-side fault occurred and the LPT switching is triggered. To detect a network-side fault on a PSN, LPT OAM or PW OAM packets can be used. Note that the PW OAM function must be enabled on NEs before usage of PW OAM packets.
Fault Detection Period (100ms)	10 to 100	Sets the fault detection period.
User-Side Port Status	For example: Open	Displays the user-side port status.
L2 net ID-L2 Peer net ID	-	Displays the L2 net ID and L2 peer net ID.

**Table 2** Parameters of the Point-to-Multipoint LPT
Field	Value	Description
Primary Function Point Type	UNI, PW	Sets the primary function type.
Primary Function Point	Slot-Board	Displays the primary function point.
Board	Slot-Board	Sets the board of function point.
Port	Port (Port No.)	Sets the port of function point.
Point ID	-	Sets the point ID of function point.
LPT Instance Status	Normal, Fault at access side, Fault on service network, Waiting for fault recovery, Recovering from fault	Sets the LPT instance status.
LPT Enabled	Enabled, Disenabled	Sets the LPT enabled status.
Recovery Time (s)	1 to 600	Sets recovery time.
Hold-Off Time (ms)	0 to 10000	After the LPT switching is enabled, the port notifies the peer end of the enabling operation after the hold time expires.
Switching Mode	Strict mode, Non-strict mode	Sets the switching mode of point-to-multipoint LPT. Strict mode: A primary point triggers LPT switching when all its secondary points detect faults. Non-strict mode: A primary point triggers LPT switching when anyone of its secondary points detects a fault.
Fault Detection Mode	LPT OAM, PW OAM	Sets the fault detection mode of LPT. LPT-enabled NEs periodically transmit LPT OAM packets in specific formats to check the status of an L2 service network or QinQ service network. If the LPT OAM packets are absent for 3.5 fault detection periods or the number and contents of received LPT OAM packets are incorrect, the NEs consider that a network-side fault occurred and the LPT switching is triggered. To detect a network-side fault on a PSN, LPT OAM or PW OAM packets can be used. Note that the PW OAM function must be enabled on NEs before usage of PW OAM packets.
Fault Detection Period (100ms)	10 to 100	Displays the fault detection period.
User-Side Port Status	For example: Open	Displays the user-side port status.
L2 net ID-L2 Peer net ID	-	Displays the L2 net ID and L2 peer net ID.
Access Point Type	For example: PW	Displays the access point type.
Access Point	-	Displays the access point.

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