LCAS

The LCAS is applied on the basis of virtual concatenation and can improve the performance of virtual concatenation. The LCAS can dynamically adjust the number of virtual containers for mapping required services to meet the bandwidth requirements of the application. As a result, the bandwidth utilization is improved. In this user interface, you can enable or disable the link capacity adjustment scheme (LCAS) function.

Navigation Path

In the NE Explorer, select a board and choose Configuration > Ethernet Interface Management > Ethernet Interface from the Function Tree. Select the Internal Port and then click the LCAS tab.

In the NE Explorer, select a board and choose Configuration > Advanced Attribute > LCAS.

Guideline

The class of bound path configured for the Ethernet board on the source NE must be the same as that on the sink NE. Otherwise, the LCAS function fails to be configured.
The configuration that complies with the LCAS protocol should meet the following two requirements:
- The configured services should be bidirectional services that adopt virtual concatenation.
- The networking topology should be of the point-to-point mode.
When configuring the LCAS function, you must set the LCAS parameters to the same values for the equipment at the two ends.
- The LCAS enable/disable attribute of the equipment at the two ends must be the same.
- The equipment at the two ends must be set to the same LCAS mode.
Adhere to the following principles when planning the LCAS:
- The LCAS at both sides must be enabled or disabled.
- If the LCAS is enabled at both sides, the used LCAS parameters at both sides must be consistent.
- If the opposite equipment is the third-party equipment and does not support the Huawei mode, set the LCAS mode to the standard mode. Otherwise, set the mode to the Huawei mode at both sides.
- It is recommended that you set the delay time to 2000 ms.
- It is recommended that you set the WTR time to 300 seconds.
- It is recommended that you disable the TSD.

Parameters

Field	Value	Description
Port	VCTRUNKn	A VCTRUNK port numbered n.
Enabling LCAS	Enabled, Disabled Default: Disabled	The Enabling LCAS parameter can increase or decrease the network capacity without affecting the service. The capacity is automatically decreased if a member fails, and is automatically increased if the member recovers.
LCAS Mode	Huawei mode, Standard mode Default: Huawei mode	The LCAS Mode parameter specifies the sequence for the sink end to respond to the MST and Rs_Ack messages received from the source end.
Hold off Time (ms)	Values of parameters vary with different boards and products. For details, click the links in the Description column.	The Hold off Time (ms)(LCAS) parameter is also called HO Procedure Timer Duration. It specifies HO Procedure Timer Duration of the LCAS protocol. If the LCAS coexists with another network-level protection scheme (for example, MSP or SNCP), you can set this parameter to postpone the LCAS switching.
WTR Time (s)	Values of parameters vary with different boards and products. For details, click the links in the Description column.	The WTR Time (s) parameter is also called WTR Procedure Timer Duration. It specifies WTR Procedure Timer Duration of the LCAS protocol. Set this parameter to avoid impact caused by the alarm jitter on the link status.
TSD	Enabled, Disabled Default: Disabled	The TSD (LCAS) parameter specifies the B3 or BIP error status of a VCTRUNK member. TSD stands for trail signal degrade. When this parameter is set to Enabled, and if a VCTRUNK member has excessive B3 or BIP bit errors, the LCAS protocol regards that this member fails and deletes it from the available members. If this parameter is set to Disabled, the LCAS protocol does not monitor the status of the B3 or BIP bit errors of a VCTRUNK member.
Min. Members - Transmit Direction	2 to 256	Sets the min. members - transmit direction. When the LCAS is enabled and the number of available members is smaller than this value, an alarm is reported.
Min. Members - Receive Direction	2 to 256	Sets the min. members - receive direction. When the LCAS is enabled and the number of available members is smaller than this value, an alarm is reported.
Enable LCAS Switching Triggerde by LP_TIM	Enabled, Disabled	Specifies whether LCAS switching is triggered when an LP_TIM alarm is detected on the board.