One day, customer feedback one ethernet service down with LCAS when in-loop service on line board.
Don't use loop method to test service when enable LCAS.
R&D test such case in Lab, and find that when in-loop or out-loop service, the protocol of LCAS will become disordered, and finally service become down.
When enable LCAS function, don't loop service. Loop service will make the protocol become disordered and finnally service will down.