In this VLAN, we have one floating IP (Allow custom, include default + 44 port) and 2 IPs one for each device who have this config: PortLockDown=Allow All, Traffic Group= NonFloating, Inherit traffic group partition is UNCHECKED.
is 10.51.26.229.161 floating or non-floating self ip? can you try snmp to non-floating self ip?
and can you check how many snmpd is running? is it similar to this?
e.g.
[root@ve11a:Active:In Sync] ~ ps -elf | grep snmp | grep -v grep
0 S root 5951 5832 0 80 0 - 409 - Aug25 ? 0:00 runsv snmpd
4 S root 5958 5951 0 80 0 - 9953 - Aug25 ? 0:07 /usr/sbin/snmpd -f -c /config/snmp/snmpd.conf -I-ifTable ifXTable ipAddressTable -Lsd -LF 6 /var/log/snmpd.log -p /var/run/snmpd.pid
0 S root 6746 5832 0 80 0 - 409 - Aug25 ? 0:00 runsv rmonsnmpd
0 S root 6759 6746 0 80 0 - 6852 - Aug25 ? 0:00 /usr/sbin/rmonsnmpd -f -c /config/snmp/subagents.conf -s -l /dev/null
0 S root 8109 5832 0 80 0 - 409 - Aug25 ? 0:00 runsv nokiasnmpd