< draft-ietf-rtgwg-net2cloud-problem-statement-04.txt   draft-ietf-rtgwg-net2cloud-problem-statement-05.txt >
Network Working Group L. Dunbar Network Working Group L. Dunbar
Internet Draft Futurewei Internet Draft Futurewei
Intended status: Informational Andy Malis Intended status: Informational Andy Malis
Expires: Dec 2019 Independent Expires: March 2020 Independent
C. Jacquenet C. Jacquenet
Orange Orange
M. Toy M. Toy
Verizon Verizon
September 23, 2019 November 1, 2019
Dynamic Networks to Hybrid Cloud DCs Problem Statement Dynamic Networks to Hybrid Cloud DCs Problem Statement
draft-ietf-rtgwg-net2cloud-problem-statement-04 draft-ietf-rtgwg-net2cloud-problem-statement-05
Abstract Abstract
This document describes the problems that enterprises face today This document describes the problems that enterprises face today
when interconnecting their branch offices with dynamic workloads in when interconnecting their branch offices with dynamic workloads in
third party data centers (a.k.a. Cloud DCs). third party data centers (a.k.a. Cloud DCs). There can be many
problems associated with network connecting to or among Clouds, many
of which probably are out of the IETF scope. The objective of this
document is to identify some of the problems that need additional
work in IETF Routing area. Other problems are out of the scope of
this document.
It examines some of the approaches interconnecting cloud DCs with It examines some of the approaches interconnecting cloud DCs with
enterprises' on-premises DCs & branch offices. This document also enterprises' on-premises DCs & branch offices. This document also
describes some of the network problems that many enterprises face describes some of the network problems that many enterprises face
when they have workloads & applications & data split among different when they have workloads & applications & data split among different
data centers, especially for those enterprises with multiple sites data centers, especially for those enterprises with multiple sites
that are already interconnected by VPNs (e.g., MPLS L2VPN/L3VPN). that are already interconnected by VPNs (e.g., MPLS L2VPN/L3VPN).
Current operational problems are examined to determine whether there Current operational problems are examined to determine whether there
is a need to improve existing protocols or whether a new protocol is is a need to improve existing protocols or whether a new protocol is
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months and may be updated, replaced, or obsoleted by other documents months and may be updated, replaced, or obsoleted by other documents
at any time. It is inappropriate to use Internet-Drafts as at any time. It is inappropriate to use Internet-Drafts as
reference material or to cite them other than as "work in progress." reference material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html http://www.ietf.org/shadow.html
This Internet-Draft will expire on March 23, 2009. This Internet-Draft will expire on April 1, 2009.
Copyright Notice Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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Section 4.e of the Trust Legal Provisions and are provided without Section 4.e of the Trust Legal Provisions and are provided without
warranty as described in the Simplified BSD License. warranty as described in the Simplified BSD License.
Table of Contents Table of Contents
1. Introduction...................................................3 1. Introduction...................................................3
1.1. On the evolution of Cloud DC connectivity.................3 1.1. On the evolution of Cloud DC connectivity.................3
1.2. The role of SD-WAN techniques in Cloud DC connectivity....4 1.2. The role of SD-WAN techniques in Cloud DC connectivity....4
2. Definition of terms............................................4 2. Definition of terms............................................4
3. Interconnecting Enterprise Sites with Cloud DCs................5 3. Interconnecting Enterprise Sites with Cloud DCs................5
3.1. Multiple connections to workloads in a Cloud DC...........5 3.1. Multiple connections to workloads in a Cloud DC...........6
3.2. Interconnect Private and Public Cloud DCs.................7 3.2. Interconnect Private and Public Cloud DCs.................7
3.3. Desired Properties for Networks that interconnect Hybrid 3.3. Desired Properties for Networks that interconnect Hybrid
Clouds.........................................................8 Clouds.........................................................8
4. Multiple Clouds Interconnection................................9 4. Multiple Clouds Interconnection................................9
4.1. Multi-Cloud Interconnection...............................9 4.1. Multi-Cloud Interconnection...............................9
4.2. Desired Properties for Multi-Cloud Interconnection.......11 4.2. Desired Properties for Multi-Cloud Interconnection.......11
5. Problems with MPLS-based VPNs extending to Hybrid Cloud DCs...11 5. Problems with MPLS-based VPNs extending to Hybrid Cloud DCs...11
6. Problem with using IPsec tunnels to Cloud DCs.................13 6. Problem with using IPsec tunnels to Cloud DCs.................13
6.1. Complexity of multi-point any-to-any interconnection.....13 6.1. Complexity of multi-point any-to-any interconnection.....13
6.2. Poor performance over long distance......................14 6.2. Poor performance over long distance......................14
6.3. Scaling Issues with IPsec Tunnels........................14 6.3. Scaling Issues with IPsec Tunnels........................14
7. Problems of Using SD-WAN to connect to Cloud DCs..............15 7. Problems of Using SD-WAN to connect to Cloud DCs..............15
7.1. SD-WAN among branch offices vs. interconnect to Cloud DCs15 7.1. SD-WAN among branch offices vs. interconnect to Cloud DCs15
8. End-to-End Security Concerns for Data Flows...................18 8. End-to-End Security Concerns for Data Flows...................18
9. Requirements for Dynamic Cloud Data Center VPNs...............18 9. Requirements for Dynamic Cloud Data Center VPNs...............18
10. Security Considerations......................................19 10. Security Considerations......................................19
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