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Cumulus switches use a combination of the Cumulus netshow command and standard Linux sockets.

Service Command
Interface counters ethtool -m
Interface error counters ethtool -m
Interface status

Interface status is collected using the netlink api (AF_INET)

LLDP neighbors lldpctl -f json
BGP Sessions vtysh -c 'show ip bgp summary json'
Hostname hostname
MAC Table

MAC address collection is done using an event-monitor for performance. show event-monitor mac and show mac address-table

Routing table

show ip route and the AF_INET linux socket

Port-channel netshow bondmems --json
MLAG clagctl -j