А может ли быть SNMP v2c over TCP?

       At its simplest, a listening address may consist only of a port number,
       in  which  case  snmpd listens on that UDP port on all IPv4 interfaces.
       Otherwise, the <transport-address> part of the specification is  parsed
       according to the following table:

           <transport-specifier>       <transport-address> format

           udp (default)               hostname[:port] or IPv4-address[:port]

           tcp                         hostname[:port] or IPv4-address[:port]

           unix                        pathname

           ipx                         [network]:node[/port]

           aal5pvc or pvc              [interface.][VPI.]VCI

           udp6 or udpv6 or udpipv6    hostname[:port] or IPv6-address[:port]

           tcp6 or tcpv6 or tcpipv6    hostname[:port] or IPv6-address[:port]

snmpcmd [OPTIONS] AGENT [PARAMETERS]



AGENT SPECIFICATION
       The string AGENT in the SYNOPSIS above specifies the remote SNMP
       entity with which to communicate.  This specification takes  the
       form:

              [<transport-specifier>:]<transport-address>

       At  its simplest, the AGENT specification may consist of a host‐
       name, or an IPv4 address in the standard "dotted quad" notation.
       In  this case, communication will be attempted using UDP/IPv4 to
       port 161 of the given host.  Otherwise, the  <transport-address>
       part  of  the specification is parsed according to the following
       table:

           <transport-specifier>       <transport-address> format

           udp                         hostname[:port]               or
                                       IPv4-address[:port]

           tcp                         hostname[:port]               or
                                       IPv4-address[:port]

           unix                        pathname

           ipx                         [network]:node[/port]

           aal5pvc or pvc              [interface.][VPI.]VCI

           udp6 or udpv6 or udpipv6    hostname[:port]               or
                                       IPv6-address:port or
                                        '['IPv6-address']'[:port]

           tcp6 or tcpv6 or tcpipv6    hostname[:port]               or
                                       IPv6-address:port or
                                        '['IPv6-address']'[:port]