Currently it is hard to determine if remote SNMP agent supports needed OID/subtree using automated tools with bsnmpget(1) because it prints an error to stdout mixing it with received other data.

This change makes it print error to stderr, as well as bsnmpwalk/bsnmpset that is same tool really.

Try to check for IF-MIB::ifHCInMulticastPkts

bsnmpwalk -o quiet -n -r 3 -t 2 -s public@switch .1.3.6.1.2.1.31.1.1.1.8 > /dev/null