Remote Network Monitoring MIB Protocol Identifier Reference
Andy Bierman, C. Bucci, R. Iddon · 2000
This memo defines a notation describing protocol layers in a protocol encapsulation, specifically for use in encoding INDEX values for the protocolDirTable, found in the RMON-2 MIB (Remote Network Monitoring Management Information Base) [RFC2021]. The definitions for the standard protocol directory base layer identifiers are also included.