This document describes a Transport Subsystem, extending the Simple Network 

Management Protocol (SNMP) architecture defined in RFC 3411.This document 

describes a subsystem to contain transport models, comparable to other subsystems 

in the RFC3411 architecture.  As work is being done to expand the transport to include 

secure transport such as SSH and TLS, using a subsystem will enable consistent 

design and modularity of such transport models. This document identifies and 

discusses some key aspects that need to be considered for any transport model for 

SNMP.