1. May be Wrong configuration.
2. Problem in physical connectivity.
3. May be hardware issue.
Checked all the physical connectivity between devices and found it OK. Physical connectivity is attached.
Checked all the configuration at both end and found OK.
In the attached diagrame whenever fibre 1 or 3 goes down, remote port goes down but, at huawei end port remains in up state so it do not shift traffic to another port and drops all the packets.
We dont found auto-negotiation enabled on ports. As soon as we enabled Auot-neg on ports, problem got solved. Whenever we connect our device to other vendor device, auto-negotiation must be enable on connecting interface.
Interface negotiation fail between different vendor devices.
Enabled Auot-negotiation on ports