< draft-ietf-nvo3-use-case-11.txt   draft-ietf-nvo3-use-case-12.txt >
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Category: Informational Huawei Category: Informational Huawei
M. Toy M. Toy
A. Isaac A. Isaac
Juniper Networks Juniper Networks
V. Manral V. Manral
Ionos Networks Ionos Networks
Expires: April 2017 October 3, 2016 Expires: April 2017 October 3, 2016
Use Cases for Data Center Network Virtualization Overlays Use Cases for Data Center Network Virtualization Overlay Networks
draft-ietf-nvo3-use-case-11 draft-ietf-nvo3-use-case-12
Abstract Abstract
This document describes data center network virtualization over This document describes data center network virtualization over
layer (NVO3) use cases that can be deployed in various data centers layer (NVO3) network use cases that can be deployed in various data
and serve different applications. centers and serve different data center applications.
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with This Internet-Draft is submitted to IETF in full conformance with
the provisions of BCP 78 and BCP 79. the provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
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Acknowledgements.................................................14 Acknowledgements.................................................14
Authors' Addresses...............................................14 Authors' Addresses...............................................14
1. Introduction 1. Introduction
Server virtualization has changed the Information Technology (IT) Server virtualization has changed the Information Technology (IT)
industry in terms of the efficiency, cost, and speed of providing industry in terms of the efficiency, cost, and speed of providing
new applications and/or services such as cloud applications. However new applications and/or services such as cloud applications. However
traditional data center (DC) networks have some limits in supporting traditional data center (DC) networks have some limits in supporting
cloud applications and multi tenant networks [RFC7364]. The goal of cloud applications and multi tenant networks [RFC7364]. The goal of
data center network virtualization overlay (NVO3) network is to data center network virtualization overlay (NVO3) networks is to
decouple the communication among tenant systems from DC physical decouple the communication among tenant systems from DC physical
infrastructure networks and to allow one physical network infrastructure networks and to allow one physical network
infrastructure to provide: infrastructure:
o Multi-tenant virtual networks and traffic isolation among the o Carry many NVO3 networks and isolate different NVO3 network
virtual networks over the same physical network. traffic on a physical network that carries NVO3 network traffic.
o Independent address spaces in individual virtual networks such as o Independent address spaces in individual NVO3 networks such as
MAC, IP, TCP/UDP etc. MAC, IP, TCP/UDP etc.
o Flexible Virtual Machines (VM) and/or workload placement o Flexible Virtual Machines (VM) and/or workload placement
including the ability to move them from one server to another including the ability to move them from one server to another
without requiring VM address and configuration changes, and the without requiring VM address changes and physical infrastructure
ability to perform a "hot move" with no disruption to the live network configuration changes, and the ability to perform a "hot
application running on VMs. move" with no disruption to the live application running on VMs.
These characteristics of NVO3 help address the issues that cloud These characteristics of NVO3 networks help address the issues that
applications face in Data Centers [RFC7364]. cloud applications face in data centers [RFC7364].
An NVO3 network may interconnect with another NVO3 network on the An NVO3 network may interconnect with another NVO3 network on the
same physical network, or another physical network (i.e., not the same physical network, or another physical network (i.e., not the
physical network that the NVO3 network is over), via a gateway. The physical network that the NVO3 network is carried over), via a
use case examples for the latter are: 1) DCs that migrate toward an gateway. The use case examples for the latter are: 1) DCs that
NVO3 solution will be done in steps, where a portion of tenant migrate toward an NVO3 solution will be done in steps, where a
systems in a VN is on virtualized servers while others exist on a portion of tenant systems in a VN is on virtualized servers while
LAN. 2) many DC applications serve to Internet users who are on others exist on a LAN. 2) many DC applications serve to Internet
physical networks; 3) some applications are CPU bound, such as Big users who are on physical networks; 3) some applications are CPU
Data analytics, and may not run on virtualized resources. Some bound, such as Big Data analytics, and may not run on virtualized
inter-VN policies can be enforced at the gateway. resources. Some inter-VN policies can be enforced at the gateway.
This document describes general NVO3 use cases that apply to various This document describes general NVO3 network use cases that apply to
data centers. The use cases described here represent DC provider's various data centers. The use cases described here represent DC
interests and vision for their cloud services. The document groups provider's interests and vision for their cloud services. The
the use cases into three categories from simple to advance in term document groups the use cases into three categories from simple to
of implementation. However the implementations of these use cases advance in term of implementation. However the implementations of
are outside the scope of this document. These three categories are these use cases are outside the scope of this document. These three
highlighted below: categories are highlighted below:
o Basic NVO3 networks (Section 2). All Tenant Systems (TS) in the o Basic NVO3 networks (Section 2). All Tenant Systems (TS) in the
network are located within the same DC. The individual networks network are located within the same DC. The individual networks
can be either Layer 2 (L2) or Layer 3 (L3). The number of NVO3 can be either Layer 2 (L2) or Layer 3 (L3). The number of NVO3
networks in a DC is much higher than what traditional VLAN based networks in a DC is much higher than what traditional VLAN based
virtual networks [IEEE 802.1Q] can support. This case is often virtual networks [IEEE 802.1Q] can support. This case is often
referred as to the DC East-West traffic. referred as to the DC East-West traffic.
o A virtual network that spans across multiple Data Centers and/or o A virtual network that spans across multiple Data Centers and/or
to customer premises where NVO3 networks are constructed and to customer premises where NVO3 networks are constructed and
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