This International Standard defines a protocol for the exchange of routeing information between an End System and a Subnetwork Address Resolution Entity, and between an Intermediate System and a Subnetwork Address Resolution Entity. This International Standard is applicable to: a) End Systems which operate according to the main body of ISO/IEC 8878 to provide and support the OSI Connection-mode Network Service using ISO/IEC 8208. b) Subnetwork Address Resolution Entities which operate ISO/IEC 8208. NOTE — The Subnetwork Address Resolution Entity defined in this International Standard may be associated with relay functions as defined in ISO/IEC 10028 and ISO/IEC 10177. c) Intermediate systems which operate ISO/IEC 8208. End Systems which provide and support the OSI CONS using the fast select 1980 procedures or the alternative 1980 procedures in annex A of ISO/IEC 8878 are outside the scope of this International Standard. This International Standard does not specify any protocol elements nor algorithms for facilitating routeing and relaying among SNAREs. Such functions are intentionally outside the scope of this International Standard. To evaluate conformance of a particular implementation, it is necessary to have a statement of which capabilities and options have been implemented. Such a statement is called Protocol Implementation Conformance Statement (PICS), as defined in ISO/IEC 9646-1. This International Standard provides the PICS proforma in compliance with the relevant requirements, and in accordance with the relevant guidance, given in ISO 9646-7.