ETSI GR NFV-IFA 022 V3.1.1 (2018-04)

Network Functions Virtualisation (NFV) Release 3; Management and Orchestration; Report on Management and Connectivity for Multi-Site Services

DGR/NFV-IFA022

General Information

• Status: Published
• Publication Date: 18-Apr-2018
• Technical Committee: NFV IFA - Interfaces and Architecture
• Current Stage: 12 - Completion
• Due Date: 01-May-2018
• Completion Date: 19-Apr-2018

Standards Content (Sample)

GROUP REPORT
Network Functions Virtualisation (NFV) Release 3;
Management and Orchestration;
Report on Management and Connectivity
for Multi-Site Services
Disclaimer
The present document has been produced and approved by the Network Functions Virtualisation (NFV) ETSI Industry
Specification Group (ISG) and represents the views of those members who participated in this ISG.
It does not necessarily represent the views of the entire ETSI membership.

2 ETSI GR NFV-IFA 022 V3.1.1 (2018-04)

Reference
DGR/NFV-IFA022
Keywords
interface, management, NFV, orchestration,
service
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3 ETSI GR NFV-IFA 022 V3.1.1 (2018-04)
Contents
Intellectual Property Rights . 7
Foreword . 7
Modal verbs terminology . 7
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 8
3 Definitions and abbreviations . 10
3.1 Definitions . 10
3.2 Abbreviations . 10
4 Overview . 11
4.1 Introduction . 11
5 Use Cases . 12
5.1 Introduction . 12
5.2 Use Case 1: Network Service for E2E Enterprise virtual Customer Premises Equipment (vCPE) . 12
5.2.1 Introduction. 12
5.2.2 Trigger . 14
5.2.3 Actors and roles . 14
5.2.4 Pre-conditions . 15
5.2.5 Post-conditions . 15
5.2.6 Operational Flows . 15
5.2.7 Other Considerations . 20
5.2.7.1 Network Service Instance Description . 20
5.2.7.2 Infrastructure Description . 20
5.2.7.3 Mapping of Service Instance Model to Supporting Infrastructure . 21
5.2.7.4 Management Architecture and Activities . 22
5.2.8 Analysis . 23
5.3 Use Case 2: Network Service for E2E Enterprise vCPE across two WANs . 26
5.3.1 Introduction. 26
5.3.2 Trigger . 28
5.3.3 Actors and roles . 28
5.3.4 Pre-conditions . 28
5.3.5 Post-conditions . 28
5.3.6 Operational Flows . 29
5.3.7 Other Considerations (e.g. Performance) . 29
5.3.8 Analysis . 29
5.4 Use Case 3: NS Expansion to other NFVI-PoPs over WAN . 31
5.4.1 Introduction. 31
5.4.2 Trigger . 32
5.4.3 Actors and roles . 32
5.4.4 Pre-conditions . 33
5.4.5 Post-conditions . 33
5.4.6 Operational Flows . 33
5.4.7 Other Considerations (e.g. Performance) . 34
5.4.8 Analysis . 34
5.5 Use case 4: Network Service Virtual Link aggregation . 34
5.5.1 Introduction. 34
5.5.2 Trigger . 35
5.5.3 Actors and roles . 35
5.5.4 Pre-conditions . 36
5.5.5 Post-conditions . 36
5.5.6 Operational Flows . 36
5.5.7 Other Considerations (e.g. Performance) . 36
5.5.8 Analysis . 37
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5.6 Use case 5: Checking multi-site connectivity . 38
5.6.1 Introduction. 38
5.6.2 Trigger . 39
5.6.3 Actors and roles . 39
5.6.4 Pre-conditions . 39
5.6.5 Post-conditions . 39
5.6.6 Operational Flows . 40
5.6.7 Other Considerations (e.g. Performance) . 40
5.6.8 Analysis . 40
5.7 Use case 6: Multi-site Virtual Link redundancy . 41
5.7.1 Introduction. 41
5.7.2 Trigger . 42
5.7.3 Actors and roles . 42
5.7.4 Pre-conditions . 43
5.7.5 Post-conditions . 43
5.7.6 Operational Flows . 43
5.7.7 Other Considerations (e.g. Performance) . 43
5.7.8 Analysis . 44
5.8 Use case 7: Multi-site Virtual Link healing . 45
5.8.1 Introduction. 45
5.8.2 Trigger . 47
5.8.3 Actors and roles . 47
5.8.4 Pre-conditions . 47
5.8.5 Post-conditions . 48
5.8.6 Operational Flows . 48
5.8.7 Other Considerations (e.g. Performance) . 49
5.8.8 Analysis . 49
5.9 Use case 8: Multi-site VNF deployment . 50
5.9.1 Introduction. 50
5.9.2 Trigger . 52
5.9.3 Actors and roles . 52
5.9.4 Pre-conditions . 53
5.9.5 Post-conditions . 53
5.9.6 Operational Flows . 53
5.9.7 Other Considerations (e.g. Performance) . 55
5.9.8 Analysis . 55
5.10 Use case 9: Addressing multi-site deployment requirements in NSDs . 56
5.10.1 Introduction. 56
5.10.2 Trigger . 56
5.10.3 Actors and roles . 57
5.10.4 Pre-conditions . 57
5.10.5 Post-conditions . 57
5.10.6 Operational Flows . 57
5.10.7 Other Considerations (e.g. Performance) . 57
5.10.8 Analysis . 57
5.11 Use Case 10: User Equipment (UE) Location Triggered Network Service Migration Across NFVI PoPs . 60
5.11.1 Introduction. 60
5.11.2 Triggers . 61
5.11.3 Actors and roles . 62
5.11.4 Pre-conditions . 62
5.11.5 Post-conditions . 63
5.11.6 Operational Flows . 63
5.11.7 Other Considerations (e.g. Performance) . 64
5.11.8 Analysis . 64
5.12 Use case 11: Modification to the WAN Connectivity Resource of a Multi-site NS. 65
5.12.1 Introduction. 65
5.12.2 Trigger . 65
5.12.3 Actors and roles . 65
5.12.4 Pre-conditions . 66
5.12.5 Post-conditions . 66
5.12.6 Operational Flows . 66
5.12.7 Other Considerations (e.g. Performance) . 67
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5.12.8 Analysis . 67
5.13 Use Case 12: Network Service for virtual Radio Access Network (vRAN) . 67
5.13.1 Introduction. 67
5.13.2 Trigger . 69
5.13.3 Actors and roles . 69
5.13.4 Pre-conditions . 70
5.13.5 Post-conditions . 70
5.13.6 Operational Flows . 70
5.13.7 Other Considerations (e.g. Performance) . 72
5.13.8 Analysis . 72
5.14 Use case 13: Use of WAN connectivity by compute-only NFVI-PoP deployments . 73
5.14.1 Introduction. 73
5.14.2 Trigger . 74
5.14.3 Actors and roles . 75
5.14.4 Pre-conditions . 75
5.14.5 Post-conditions . 75
5.14.6 Operational Flows . 76
5.14.7 Other Considerations (e.g. Performance) . 76
5.14.8 Analysis . 77
6 Analysis . 78
6.1 Use Case analysis with a focus on the NFV-MANO functions . 78
6.2 Analysis about WIM role . 79
6.2.1 Existing concept of WIM and Network Controller . 79
6.2.2 Analysis about connectivity service decomposition . 79
6.2.3 Analysis about WIM role in multi-site connectivity . 80
6.3 Potential architecture options . 81
6.3.1 Introduction. 81
6.3.2 Architecture option #A: WIM integration as specialized VIM . 81
6.3.3 Architecture option #B: Managing WIM functionality of OSS/BSS with Os-Ma-nfvo reference
points . 83
6.4 Information modelling analysis . 85
6.4.1 General . 85
6.4.2 Gap analysis and extensions to NSD and VNFD . 85
6.4.2.1 Current connectivity model in the NSD (IFA 014) . 85
6.4.2.2 Affinity/anti-affinity constraints . 86
6.4.2.2.1 Description . 86
6.4.2.2.2 Identified gaps and/or extensions . 88
6.4.2.3 NS VL service availability features . 88
6.4.2.3.1 Description . 88
6.4.2.3.2 Identified gaps and/or extensions . 89
6.4.3 Gap analysis and extensions to NS runtime information . 89
6.4.3.1 Current connectivity model in the NS runtime information (ETSI GS NFV-IFA 013) . 89
6.4.3.2 NS VL runtime view . 90
6.4.3.2.1 Description . 90
6.4.3.2.2 Identified gaps and/or extensions . 93
6.4.4 Gap analysis and extensions to VNF runtime information . 93
6.4.4.1 Current connectivity model in the VNF runtime information (ETSI GS NFV-IFA 007) . 93
6.4.4.2 VNF VL runtime view . 94
6.4.4.2.1 Description . 94
6.4.4.2.2 Identified gaps and/or extensions . 95
6.4.5 Gap analysis and extensions to virtualised network resource runtime information . 96
6.4.5.1 Current connectivity model related to virtual network and NFVI-PoP connectivity (ETSI GS

NFV-IFA 005) . 96
6.4.5.2 Virtual network runtime deployment view . 97
6.4.5.2.1 Description . 97
6.4.5.2.2 Identified gaps and/or extensions . 99
6.4.5.3 NFVI-PoP and WAN connectivity views . 99
6.4.5.3.1 Description . 99
6.4.5.3.2 Identified gaps and/or extensions . 100
7 Recommendations . 100
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7.1 Overview . 100
7.2 General recommendations . 100
7.3 Functional recommendations. 101
7.4 Reference points and/or interfaces . 103
7.4.1 Reference point between OSS/BSS and NFVO (Os-Ma-nfvo) . 103
7.4.2 Reference point between NFVO and VNFM (Or-Vnfm) . 103
7.4.3 Reference point between NFVO and VIM (Or-Vi) . 104
7.4.4 Reference point between NFVO and WIM . 105
7.5 Descriptors and other information/data model artefacts . 105
7.6 Recommendations related to Security . 107
8 Conclusion . 108
Annex A: A collection of variants of multi-site NS deployment . 109
A.1 Introduction . 109
A.2 L2 WAN connectivity . 109
A.2.1 Case 1: Extending a VLAN network across WAN . 109
A.2.1.1 Overview . 109
A.2.1.2 Properties of virtual network resources . 110
A.2.1.3 Operational flow . 111
A.2.1.4 Considerations . 112
A.2.1.4.1 Distributed control and centralized control in VLAN ID assignment . 112
A.2.1.4.2 Supporting L3 connectivity services . 112
A.2.2 Case 2: EVPN connection with Inter-AS among NFVI-PoPs . 112
A.2.2.1 Overview . 112
A.2.2.2 Properties of virtual network resources . 113
A.2.2.3 Operational flow . 114
A.3 L3 WAN connectivity . 116
A.3.1 Case 1: VXLAN connection over L3 WAN connectivity between NFVI-PoPs . 116
A.3.1.1 Overview . 116
A.3.1.2 Properties of virtual network resources . 117
A.3.1.3 Operational flow . 118
Annex B: Gap analysis between WIM and Network Controller . 120
B.1 Introduction . 120
B.2 Recap on Analysis of SDN across multiple VIMs . 120
B.3 SDN Architecture for Transport Networks . 120
B.4 Interoperability test and demonstration by ONF/ OIF in 2016 . 121
B.5 ETSI-NFV PoC#42 Mapping ETSI-NFV onto Multi-Vendor, Multi-Domain Transport SDN . 122
B.6 Analysis . 122
Annex C: Security and Regulatory Concerns . 124
C.1 Risk analysis and assessment . 124
Annex D: Authors & contributors . 126
History . 128

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7 ETSI GR NFV-IFA 022 V3.1.1 (2018-04)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This Group Report (GR) has been produced by ETSI Industry Specification Group (ISG) Network Functions
Virtualisation (NFV).
Modal verbs terminology
In the present document "should", "should not", "may", "need not", "will", "will not", "can" and "cannot" are to be
interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
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8 ETSI GR NFV-IFA 022 V3.1.1 (2018-04)
1 Scope
The present document provides a report on the functional architecture necessary to provision and manage multi-site
network services. To this end, a set of multi-site use cases are described, analysed and used to produce a set of
recommendations for normative work.
2 References
2.1 Normative references
Normative references are not applicable in the present document.
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI GS NFV 001: "Network Functions Virtualisation (NFV); Use Cases".
[i.2] ETSI GS NFV 003: "Network Functions Virtualisation (NFV); Terminology for Main Concepts in
NFV".
[i.3] ETSI GS NFV-EVE 005: "Network Functions Virtualisation (NFV); Ecosystem; Report on SDN
Usage in NFV Architectural Framework".
[i.4] ETSI GS NFV-INF 005 (V1.1.1): "Network Functions Virtualisation (NFV); Infrastructure;
Network Domain".
[i.5] ETSI GS NFV-MAN 001: "Network Functions Virtualisation (NFV); Management and
Orchestration".
[i.6] ETSI GS NFV-IFA 010: "Network Functions Virtualisation (NFV) Release 2; Management and
Orchestration; Functional requirements specification".
[i.7] ETSI GS NFV-IFA 005: "Network Functions Virtualisation (NFV) Release 2; Management and
Orchestration; Or-Vi reference point - Interface and Information Model Specification".
[i.8] ETSI GS NFV-IFA 007: "Network Functions Virtualisation (NFV) Release 2; Management and
Orchestration; Or-Vnfm reference point - Interface and Information Model Specification".
[i.9] ETSI GS NFV-IFA 008: "Network Functions Virtualisation (NFV) Release 2; Management and
Orchestration; Ve-Vnfm reference point - Interface and Information Model Specification".
[i.10] ETSI GS NFV-IFA 011: "Network Functions Virtualisation (NFV) Release 2; Management and
Orchestration; VNF Descriptor and Packaging Specification".
[i.11] ETSI GS NFV-IFA 013: "Network Functions Virtualisation (NFV) Release 2; Management and
Orchestration; Os-Ma-Nfvo reference point - Interface and Information Model Specification".
[i.12] ETSI GS NFV-IFA 014: "Network Functions Virtualisation (NFV) Release 2; Management and
Orchestration; Network Service Templates Specification".
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9 ETSI GR NFV-IFA 022 V3.1.1 (2018-04)
[i.13] ETSI GR NFV-IFA 015: "Network Functions Virtualisation (NFV) Release 2; Management and
Orchestration; Report on NFV Information Model".
[i.14] IETF RFC 4364: "BGP/MPLS IP Virtual Private Networks (VPNs)".
[i.15] IETF RFC 4448: "Encapsulation Methods for Transport of Ethernet over MPLS Networks".
[i.16] IETF RFC 4761: "Virtual Private LAN Service (VPLS) Using BGP for Auto-Discovery and
Signaling".
[i.17] IETF RFC 4762: "Virtual Private LAN Service (VPLS) Using Label Distribution Protocol (LDP)
Signaling".
[i.18] IETF RFC 7080: "Virtual Private LAN Service (VPLS) Interoperability with Provider Backbone
Bridges".
[i.19] IETF RFC 7348: "Virtual eXtensible Local Area Network (VXLAN): A Framework for
Overlaying Virtualized Layer 2 Networks over Layer 3 Networks".
[i.20] IETF RFC 7432: "BGP MPLS-Based Ethernet VPN".
[i.21] IETF RFC 7637: "NVGRE: Network Virtualization Using Generic Routing Encapsulation".
[i.22] IETF RFC 4090: "Fast Reroute Extensions to RSVP-TE for LSP Tunnels".
[i.23] ETSI GS NFV-REL 001: "Network Functions Virtualisation (NFV); Resiliency Requirements".
[i.24] ONF TR-512: "Core Information Model".
[i.25] ONF TR-527: "Functional Requirements for Transport API".
[i.26] ONF TAPI: "Transport API (TAPI) 2.0 Overview".
[i.27] 3GPP TS 38.401: "NG-RAN; Architecture description (Release 15)".
[i.28] ETSI TS 123 401: "LTE; General Packet Radio Service (GPRS) enhancements for Evolved
Universal Terrestrial Radio Access Network (E-UTRAN) access (3GPP TS 23.401)".
[i.29] 3GPP TS 23.501: "System Architecture for the 5G System".
[i.30] Broadband Forum TR-345: "Broadband Network Gateway and Network Function Virtualization",
Issue: 1, October 2016.
[i.31] Broadband Forum TR-359: "A Framework for Virtualization", Issue: 1, October 2016.
[i.32] ONUG: "ONUG Software-Defined WAN Use Case", October, 2014.
[i.33] ONF TR-522: "SDN Architecture for Transport Networks".
[i.34] ETSI GS NFV-SEC 004 (V1.1.1): "Network Functions Virtualisation (NFV); NFV Security;
Privacy and Regulation; Report on Lawful Interception Implications".
[i.35] ETSI GS NFV-SEC 006 (V1.1.1): "Network Functions Virtualisation (NFV); Security Guide;
Report on Security Aspects and Regulatory Concerns".
[i.36] ETSI GS NFV-SEC 010 (V1.1.1): "Network Functions Virtualisation (NFV); NFV Security;
Report on Retained Data problem statement and requirements".
[i.37] ETSI GS NFV-SEC 012 (V3.1.1): "Network Functions Virtualisation (NFV) Release 3; Security;
System architecture specification for execution of sensitive NFV components".
[i.38] IEEE STD 802.1ad: "Standard for Local and Metropolitan Area Networks - Virtual Bridged Local
Area Networks - Amendment 4: Provider Bridges", 2005.
[i.39] ANSI/IEEE Standard 802.1Q: "IEEE Standards for Local and Metropolitan Area Networks:
Virtual Bridged Local Area Networks", 1998.
ETSI
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