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Link discovery not providing all links

Hi All,

I am an end user of ODL. I have a query regarding topology discovery in ODL. I understand that LLDP is being used for link discovery between Switches and further N/w topology is computed based on that. In my setup, three OF Switches (let us say A, B and C) are on a lan.

So, once all these switches connect to ODL, it should show me the bidirectional links A-B, B-C, C-A in DLUX GUI or when I query using following RESTCONF API. http://<controller-ip>:8080/restconf/operational/network-topology:network-topology/

But I am not able to see all these links at all times, N/w topology in DLUX GUI rarely shows all these links and again after some time some of them disappears. Wireshark is showing all the LLDP packets (from each other) being received every 5s at Controller as PACKET_IN.

Could you guide that what could be the reason behind this random behavior.

Regards, Amit P.S. I am facing this behavior in both Beryllium and Carbon.