There are several SNMP agent which support SMUX. We recommend to use the latest
version of net-snmp which was formerly known as ucd-snmp.
It is free and open software and available at http://www.net-snmp.org/
and as binary package for most Linux distributions.
net-snmp has to be compiled with --with-mib-modules=smux to
be able to accept connections from Quagga.