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Ports IP3, IP4, and IP5 of the TN11TBE Board Are All Connected to the SmartBit Meter, and the ALS of Port IP3 Is Enabled. When the User Configures the VLAN Multicast Service from Port IP3 to Ports IP4 and IP5, the Laser of Port IP3 Is Shut Down. Why

Publication Date:  2012-07-25 Views:  51 Downloads:  0
Issue Description
Ports IP3, IP4, and IP5 are all connected to the SmartBit meter, and the ALS of port IP3 is enabled. When the user configures the VLAN multicast service from port IP3 to ports IP4 and IP5, the laser of port IP3 is shut down. 
 
Alarm Information
Null 
Handling Process
As the ALS is for the unidirectional service fault delivery, in the multicast scenario, it is recommended that you manually disable the ALS of the multicast interface. 
 
Root Cause
ALS principles: The ALS is for the unidirectional service fault delivery, and the downstream laser is shut down when the upstream services become faulty. Therefore, the Link that uses an IP port as its sink can affect the ALS enable status.
The ALS determines whether the Link using IP3 as its sink exists, if the Link does not exist, then the laser is shut down. When the user configures the VLAN multicast service from IP3 to IP4 and IP5, all the Link services use IP3 as their sources, and no Link services use IP3 as their sinks. Therefore, the ALS enable status cannot be changed from enabled to disabled. Thus, the laser of port IP3 is shut down and the board reports a LinkErr alarm.
When the IP3 laser is disabled, the receive direction of the 10GE card of the SmartBits meter is in the LinkDown state. Because the 10GE card currently does not support the unidirectional operation function, the transmit direction of the 10GE card is also interrupted at the same time. Thus, IP3 cannot receive the service, which causes unavailable services.
As the ALS is for the unidirectional service fault delivery, in the multicast scenario, it is recommended that you manually disable the ALS of the multicast interface.
And when the user interconnects ports IP3, IP4, and IP5 with the board or meter that supports the unidirectional operation function, the problem does not occur.
For similar causes, refer to 1.19 Impact on DWDMS ALS Function When the L4G Board Is Configured with the EVPL Service in the FAQ of the product. 
 
Suggestions
Null 

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