There seems to be a snmp module compiled and available for frr/ldpd but it isnt currently being used:
root@vyos:~# ls -la /usr/lib/x86_64-linux-gnu/frr/modules/ total 2681 drwxr-xr-x 2 root root 314 Aug 17 05:17 . drwxr-xr-x 3 root root 298 Aug 17 05:17 .. -rw-r--r-- 1 root root 84912 Aug 16 16:37 bgpd_bmp.so -rw-r--r-- 1 root root 67488 Aug 16 16:37 bgpd_rpki.so -rw-r--r-- 1 root root 264712 Aug 16 16:37 bgpd_snmp.so -rw-r--r-- 1 root root 60296 Aug 16 16:37 dplane_fpm_nl.so -rw-r--r-- 1 root root 142616 Aug 16 16:37 isisd_snmp.so -rw-r--r-- 1 root root 89832 Aug 16 16:37 ldpd_snmp.so -rw-r--r-- 1 root root 126688 Aug 16 16:37 ospf6d_snmp.so -rw-r--r-- 1 root root 178096 Aug 16 16:37 ospfd_snmp.so -rw-r--r-- 1 root root 1502720 Aug 16 16:37 pathd_pcep.so -rw-r--r-- 1 root root 38648 Aug 16 16:37 ripd_snmp.so -rw-r--r-- 1 root root 20568 Aug 16 16:37 zebra_cumulus_mlag.so -rw-r--r-- 1 root root 59336 Aug 16 16:37 zebra_fpm.so -rw-r--r-- 1 root root 56736 Aug 16 16:37 zebra_irdp.so -rw-r--r-- 1 root root 50136 Aug 16 16:37 zebra_snmp.so
root@vyos:~# ps auxwww | grep -i frr root 863 0.0 0.0 8556 3452 ? S<s Aug18 0:15 /usr/lib/frr/watchfrr -d -F traditional zebra mgmtd bgpd ripd ripngd ospfd ospf6d isisd babeld ldpd eigrpd staticd bfdd frr 909 0.0 0.2 1149348 23500 ? S<sl Aug18 0:01 /usr/lib/frr/zebra -d -F traditional -s 90000000 --daemon -A 127.0.0.1 -M snmp frr 914 0.0 0.0 10092 6504 ? S<s Aug18 0:00 /usr/lib/frr/mgmtd -d -F traditional --daemon -A 127.0.0.1 frr 916 0.0 0.2 258772 22968 ? S<sl Aug18 0:01 /usr/lib/frr/bgpd -d -F traditional --daemon -A 127.0.0.1 -M snmp -M rpki -M bmp frr 923 0.0 0.1 26880 11848 ? S<s Aug18 0:01 /usr/lib/frr/ripd -d -F traditional --daemon -A 127.0.0.1 -M snmp frr 926 0.0 0.0 9976 5716 ? S<s Aug18 0:00 /usr/lib/frr/ripngd -d -F traditional --daemon -A ::1 frr 929 0.0 0.1 29088 13060 ? S<s Aug18 0:01 /usr/lib/frr/ospfd -d -F traditional --daemon -A 127.0.0.1 -M snmp frr 932 0.0 0.1 28060 12584 ? S<s Aug18 0:01 /usr/lib/frr/ospf6d -d -F traditional --daemon -A ::1 -M snmp frr 943 0.0 0.1 28876 12940 ? S<s Aug18 0:01 /usr/lib/frr/isisd -d -F traditional --daemon -A 127.0.0.1 -M snmp frr 951 0.0 0.0 9576 5292 ? S<s Aug18 0:00 /usr/lib/frr/babeld -d -F traditional --daemon -A 127.0.0.1 frr 955 0.0 0.0 10044 7136 ? S< Aug18 0:00 /usr/lib/frr/ldpd -L -u frr -g frr frr 956 0.0 0.0 10048 7304 ? S< Aug18 0:00 /usr/lib/frr/ldpd -E -u frr -g frr frr 961 0.0 0.0 10604 5648 ? S<s Aug18 0:00 /usr/lib/frr/ldpd -d -F traditional --daemon -A 127.0.0.1 frr 967 0.0 0.0 10180 5844 ? S<s Aug18 0:00 /usr/lib/frr/eigrpd -d -F traditional --daemon -A 127.0.0.1 frr 970 0.0 0.0 9816 6152 ? S<s Aug18 0:00 /usr/lib/frr/staticd -d -F traditional --daemon -A 127.0.0.1 frr 974 0.0 0.0 9804 5540 ? S<s Aug18 0:00 /usr/lib/frr/bfdd -d -F traditional --daemon -A 127.0.0.1
Suggestion to alter /etc/frr/daemons so the line regarding ldpd becomes:
ldpd_options="--daemon -A 127.0.0.1 -M snmp"