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RPR and LPT switch while cross connection board switch because of software problem

Publication Date:  2012-07-25 Views:  37 Downloads:  0
Issue Description
One day, customer feedback after adding some SSN2EGR2 boards, when switch cross connection board from master to slave, RPR and LPT protection may 
switch together. The NE version is 5.21.18.50,  the SSN2EGR2 board version is 7.12. LCAS is enabled.
Alarm Information
None
Handling Process
Set the hold-off time of LCAS to be non-zero value. Accroding to the network instance, this value is set to be 100ms, test many times, there is no such problem happens again
Root Cause
Because RPR, LPT and LCAS these three protections are highly coupling, the switch of cross connection board may cause the RPR and LCAS state jitter, at last the LPT switchs.
Suggestions
If there is such problem, please set the hold-off time of LCAS to solve this problem

END