| --- |
| Author: János Kövesdi |
| Version: 1551-CNL 113 789, Rev. A |
| Date: 2016-11-17 |
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| --- |
| = The Generic Routing Encapsulation (GRE) Protocol Module for TTCN-3 Toolset with TITAN, Description |
| :author: János Kövesdi |
| :revnumber: 1551-CNL 113 789, Rev. A |
| :revdate: 2016-11-17 |
| :toc: |
| |
| *Copyright* |
| |
| Copyright (c) 2000-2019 Ericsson Telecom AB. + |
| All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0 that accompanies this distribution, and is available at + |
| http://www.eclipse.org/legal/epl-v10.html. |
| |
| == How to Read This Document |
| |
| This is the Description for the The Generic Routing Encapsulation (GRE) protocol module. The GRE protocol module is developed for the TTCN-3 Toolset with TITAN. |
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| == Presumed Knowledge |
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| To use this protocol module the knowledge of the TTCN-3 language <<_3, [3]>> is essential. |
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| = Functionality |
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| The protocol module implements the message structure of the Generic Routing Encapsulation (GRE) using the standard specification language TTCNv3. This allows defining of test data in the TTCNv3 language <<_3, [3]>> and correctly encoding/decoding these messages when executing test suites using the TITAN TTCNv3 test environment. |
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| == Protocol Version Implemented |
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| This set of protocol modules implements protocol messages and constants of https://tools.ietf.org/html/rfc1701[RFC 1701]. |
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| For example of GRE used over IPv4 networks, please read https://tools.ietf.org/html/rfc1701[RFC 1702]. |
| |
| == Routing Functionality |
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| The payload (a packet that needs to be encapsulated and routed) is first encapsulated in a GRE packet and the GRE packet can be encapsulated in some other protocol and then forwarded. |
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| == Modified and Non-Implemented Protocol Elements |
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| === Relaxed conditions |
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| There is no constraint between received and sent messages. |
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| == Ericsson-Specific Changes |
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| There is no Ericsson specific change in this product. |
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| == Backward Incompatibilities |
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| None. |
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| == System Requirements |
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| Protocol modules are a set of TTCN-3 source code files that can be used as part of TTCN-3 test suites only. Hence, protocol modules alone do not put specific requirements on the system used. However in order to compile and execute a TTCN-3 test suite using the set of protocol modules the following system requirements must be satisfied: |
| |
| * TITAN TTCN-3 Test Executor version R7A (1.7.pl0) or higher installed. For installation guide see <<_4, [4]>>. |
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| NOTE: This version of the protocol module is not compatible with TITAN releases earlier than R7A. |
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| = Feature List |
| |
| [[encoding-decoding-and-other-related-functions]] |
| == Encoding/Decoding and Other Related Functions |
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| This product also contains encoding/decoding functions that assure correct encoding of messages when sent from TITAN and correct decoding of messages when received by TITAN. Implemented encoding/decoding functions: |
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| [cols=3*,options=header] |
| |=== |
| |
| |Name |Type of formal parameters |Type of return value |
| |`enc_GRE_PDU` |(in PDU_GRE pdu) |octetstring |
| |`dec_GRE_PDU` |(in octetstring stream) |PDU_GRE |
| |=== |
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| = Protocol Modules |
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| == Overview |
| |
| Protocol modules implement the message structure of the related protocol in a formalized way, using the standard specification language TTCN-3. This allows defining of test data (templates) in the TTCN-3 language <<_3, [3]>> and correctly encoding/decoding messages when executing test suites using the Titan TTCN-3 test environment. |
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| == Installation |
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| The set of protocol modules can be used for developing TTCN-3 test suites using any text editor. However to make the work more efficient a TTCN-3- enabled text editor is recommended (e.g. `nedit`, `xemacs`). Since the GRE protocol is used as a part of a TTCN-3 test suite, this requires Titan TTCN-3 Test Executor be installed before the module can be compiled and executed together with other parts of the test suite. For more details on the installation of TTCN-3 Test Executor see the relevant section of <<_4, [4]>>. |
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| == Configuration |
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| == Module parameters |
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| No module parameters are used in the ICAP protocol module. |
| |
| = Terminology |
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| No specific terminology used. |
| |
| = Abbreviations |
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| ETSI:: European Telecommunications Standards Institute |
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| IETF:: Internet Engineering Task Force |
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| GRE:: Generic Routing Encapsulation |
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| TTCNv3:: Testing and Test Control Notation version 3 |
| |
| = References |
| |
| [[_1]] |
| [1] https://tools.ietf.org/html/rfc1701[RFC 1701] + |
| Generic Routing Encapsulation (GRE) |
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| [[_2]] |
| [2] https://tools.ietf.org/html/rfc1702[RFC 1702] + |
| Generic Routing Encapsulation over IPv4 networks |
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| [[_3]] |
| [3] ETSI ES 201 873-1 v.3.2.1 (02/2007) + |
| The Testing and Test Control Notation version 3. Part 1: Core Language |
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| [[_4]] |
| [4] User Guide for the TITAN TTCN-3 Test Executor |
