Internet DRAFT - draft-huang-nvo3-naas-usecases
draft-huang-nvo3-naas-usecases
nvo3 L. Huang, Ed.
Internet-Draft R. Gu, Ed.
Intended status: Informational China Mobile
Expires: April 30, 2015 L. Xia
Huawei Technologies
Q. Zu
Ericsson
October 27, 2014
Network as a Service in datacenters use cases
draft-huang-nvo3-naas-usecases-00
Abstract
Network as a Service (NaaS) is a new network business model in the
cloud computing area where virtualized E2E connectivity to end users
is provided to make the network more flexible and scalable.
This draft describes Network as a Service (NaaS) system use cases in
datacenters that are deployed typically for different applications.
Considerations about the use cases are pointed out.
Status of This Memo
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This Internet-Draft will expire on April 30, 2015.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Definition of terms . . . . . . . . . . . . . . . . . . . . . 2
3. Use cases . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Use cases 1 VPN . . . . . . . . . . . . . . . . . . . . . 3
3.2. Use cases 2 Intelligent traffic engineering across
datacenters . . . . . . . . . . . . . . . . . . . . . . . 5
4. OAM considerations . . . . . . . . . . . . . . . . . . . . . 6
5. Security considerations . . . . . . . . . . . . . . . . . . . 6
6. Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
8. Normative References . . . . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
1. Introduction
Network as a Service (NaaS) is a new network business model which
describes services for network transport connectivity in the cloud
computing area. Considering network and computing resources as a
whole, resource allocations are optimized. The target of NaaS is to
provide end to end virtual network with capacity for tenants in cloud
datacenter, which is the essential part from the technical point of
view. In NaaS, operators' network infrastructure can be virtualized
and multiplexed for selling, while clients can make the network
provision and use their own virtual network according to specific
requirements.
In this draft, we focus on proposing network use cases of NaaS in
datacenters. Two typical use cases are provided. One is about the
virtual private cloud network and another is the intelligent traffic
engineering across the datacenters. In both use cases, basic network
models are introduced and considerations about the use cases are
pointed out.
2. Definition of terms
VPCN: virtual private cloud network
FW: firewall
NAT: network address translation
LB: load balance
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TS: tenant systems
VM: virtual machine
CE: customer edge
PE: provider edge
3. Use cases
3.1. Use cases 1 VPN
One of the typical use cases in NaaS is to construct the virtual
private cloud network (VPCN) for tenants (i.e., enterprise,
organization, etc) over the public cloud provided by the operators.
Its main characteristic is that tenants can custom their own VPCN,
i.e., network topology, VPN connection, network services, etc.
Following Figure 1 is an logical network example for VPCN.
.............................................................
. VPCN +----+---+ .
. |Internet| .
. | | .
. +----+---+ .
. | .
. ........... | .
. . +---+ . +----+---+ .
. . |NAT| . |Internet| .
. . +---+ . | GW | .
. . . +----+---+ .
. . +---+ . | .
. . |FW | . | .
. . +---+ . +----+---+ .
. . . | GW | .
. . +---+ .------------- | | .
. . |LB | . +----+---+ .
. . +---+ . | .
. . . | .
. . +---+ . +----+---+ .
. . |...| . | TS | .
. . +---+ . | | .
. ........... +----+---+ .
.............................................................
Figure 1: VPCN example
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NaaS provides the network more convinent to the tenants. In
traditional service, it takes a long time for tenants to rent their
own network, while it costs more time for tenants to configure their
network. Because the all the configurations are delivered by
adminstrators manually.Besides, extensibility is limited to the
number of vlan supported.Tenants are not avaliable to monitor their
network.So it turns to NaaS in VPCN.
In NaaS, the tenants can define their networks by themselves simply
by Graphical User Interface. And the network they construct can be
controlled by themselves as well. The administrators can take a
global control from the management plane. NaaS provides it available
that networks rather than unique devices are for sale.
In such a framework, the interface information from the tenants' side
can be an issue, as the standard interface has several features.
Tenants apply for the virtual network construction they need to
deploy the end to end network. Different tenants are isolated from
each other with their access policies defined by themselves. The
virtual network can be managed, monitored and configured by tenants.
Because of the open access of network to the tenants, the network
model aimed at the tenants should be thoughtful. The network model
is constituted of node, link, flow and policy. Node acts as the role
of forwarding or processing the dataflow by some policies.Service
node provides the service, while computer node refers to the VMs.
Link connects two nodes. The network model can be divided into
several typical models to provide one of network service, something
like LBaaS, FWaaS or DNSaaS and so on.
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............................................
. +----+----+ .
. |Mnagement| ................... .
. | | . service node . .
. +----+----+ . +---+ +---+ . .
. | . |NAT| |LB | . .
. +----+----+ policy. +---+ +---+ . .
. | Router |-------. +---+ +---+ . .
. | node | link . |FW | |...| . .
. +----+----+ . +---+ +---+ . .
. | ................... .
. ...... .
. ... ... .
. ... Subnet ... .
. ... ... ................... .
. ...... . computer node . .
. | . +---+ +---+ . .
. ... . |VM | |VM | . .
. .. .. policy . +---+ +---+ . .
. . Port .------ . +---+ +---+ . .
. .. .. link . |VM | |VM | . .
. ... . +---+ +---+ . .
. ................... .
............................................
Figure 2: VPCN logical network
3.2. Use cases 2 Intelligent traffic engineering across datacenters
The intelligent traffic engineering can be regarded as another
typical use case of Network as a Service, such as the network
management across the data center. NaaS can provide the virtual
network across datacenters with intelligent traffic engineering and
load balancing. With the virtualized network and centralized
controlling, NaaS offers the capability of scheduling the traffic at
different levels of traffic QoS, reliability and transparency in a
flexible and scalable way. Besides due to the virtual network,
virtual machines can migrate from one datacenter to another flexibly.
The network model is constituted of node, link, flow and policy as
well.
Superior to the traditional network with the condition of congestion,
virtualized network provides the advantage of network bandwidth
optimization. By the statistical data of the current traffic,
Network as a Service schedules the traffic based on centralized
computing intelligently.
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In addition, services and tenants can be labeled in different
priority due to their features. Thus QoS can be guaranteed.
.......................................................................
. +---------------+ .
. |+-+-+ IDC | .
. ||VM | +---+ | .
. |+-+-+ |CE | | .
. | +-+-+ | .
. +---------+-----+ .
. +-+-+ .
. |PE | .
. +-+-+ .
. load balancing at the output | .
. bandwidth/QoS ....................... .
. ......... ......... .
. ......... IP/MPLS ......... .
. ..... WAN ..... .
. ......... ......... .
. ......... ......... .
. | ....................... | .
. | | .
. +-+-+ +-+-+ .
. |PE | |PE | .
. +-+-+ +-+-+ .
. +---------+-----+ +---------+-----+ .
. | IDC +-+-+ | | IDC +-+-+ | .
. | |CE | | | |CE | | .
. |+-+-+ +---+ | |+---+ +---+ | .
. ||VM | | ||VM | | .
. |+-+-+ | |+-+-+ | .
. +--+------------+ +--+------------+ .
. |----------- VM migration ---------| .
.......................................................................
Figure 3: Intelligent traffic engineering across the datacenter model
4. OAM considerations
TBD.
5. Security considerations
In NaaS, security can be a problem in several aspects. To meet the
requirement of the tenants, the virtual network should be secured and
tenants' traffic should be isolated with each other. On the other
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side, the security in NaaS is reflected in that traffic access should
be authorized. Other security in such as VM migration can also be an
issue.
6. Summary
This draft describes some typical use cases of NaaS in datacenters.
NaaS provides network as a service to tenants. Tenants can build
their own network by NaaS easily with the basic network model
provided. Through NaaS, traffic across the datacenters can be
optimized by intelligent traffic engineering. It's expressed in
given use cases that network virtualized with basic models can be
helpful in providing NaaS.
7. IANA Considerations
The document does not require any IANA action.
8. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
Authors' Addresses
Lu Huang (editor)
China Mobile
32 Xuanwumen West Ave, Xicheng District
Beijing 100053
China
Email: huanglu@chinamobile.com
Rong Gu (editor)
China Mobile
32 Xuanwumen West Ave, Xicheng District
Beijing 100053
China
Email: gurong@chinamobile.com
Fank Xia
Huawei Technologies
Email: frank.xialiang@huawei.com
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Qiang Zu
Ericsson
8400, boul. Decarie Ville Mont-Royal
QC
Canada
Email: Zu.Qiang@Ericsson.com
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