Topology discovery

In a VCF fabric, each device uses LLDP to collect local topology information from directly-connected peer devices. The local topology information includes connection interfaces, roles, MAC addresses, and management interface addresses of the peer devices. The local topology information is formatted and then uploaded to the Neutron database to form a topology for the entire network.

If multiple spine nodes exist in a VCF fabric, a master spine node is specified to collect the topology for the entire network.