NVO3 WG T. Ao
Internet-Draft ZTE Corporation
Intended status: Standards Track Z. Chen
Expires: May 1, 2017 China Telecom
October 28, 2016
The use case in Edge Datacenter network
draft-aoch-nvo3-edge-datacenter-00.txt
Abstract
This document introduce the Edge Datacentet network, and describe
some use cases about Edge Datacenter, discuss an important component
in the Edge Datacenter:Service Gateway and its functions.
Service Gateway as a flow distribution device in the Edge DC network,
it needs to not only play a gateway of the edge Datacenter network,
implementing coordination with existing technology,but also meets
many new requirements. For example, acts as a traffic distributor to
make sure the packets goes into Edge DC or Metro network, SDN
forwarding, and as a leaf in the leaf-spin architecture.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Edge Datacenter . . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Use case of the EDC . . . . . . . . . . . . . . . . . . . 4
3.1.1. Future video application . . . . . . . . . . . . . . 5
3.1.2. Edge IOT control application . . . . . . . . . . . . 5
3.1.3. Home Hybird Cloud . . . . . . . . . . . . . . . . . . 6
3.1.4. Light weight lease line based on application . . . . 7
4. Service Gateway . . . . . . . . . . . . . . . . . . . . . . . 8
4.1. Functions . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1.1. PPPoE proxy . . . . . . . . . . . . . . . . . . . . . 8
4.1.2. VxLAN encapsulation . . . . . . . . . . . . . . . . . 8
4.1.3. C/S VLAN forwarding . . . . . . . . . . . . . . . . . 9
4.1.4. Distribution . . . . . . . . . . . . . . . . . . . . 9
5. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . 9
6. Security Considerations . . . . . . . . . . . . . . . . . . . 9
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
8. Information References . . . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
With the challenge and the chances of the new network SDN/NFV and the
development of the Datacenter, the provider is facing many changes
from traditional network, which is representive by traditional CO.
How to use the resource of the traditinal CO fully and achieve the
transition to the SDN/NFV is the problem providers and vendors need
to consider. CO re-architection is the attractive to more and more
providers and vendors. and getting more and more attention. Using
lots of CO resource, the providers can re-architected CO to Edge DC,
which is more adaptive in SDN/NFV.
In this document, we will present the description of the Edge
Datacenter and its main component Service gateway. As a result, some
requirements are proposed for Edge DC and Service Gateway.
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2. Terminology
Edge DC: a Datacenter network which is close to user, may by
recontructureed from CO, and is SDN/NFV
Servie Gateway: flow distribution device in the Edge Datacenter
network.
CO: Center Office.
3. Edge Datacenter
There are many communication COs and there are lots of traditional
dedicated devices in these COs in providers network. But with the
evoluation of SDN/NFV, Edge Datacenter is developed based on CO.
Edge Datacenter basic architecture is showed as Figure 1. In the
Edge Datacenter, general server can be used as network element.
Virtual network elements includes vBNG,vCPE,vOLT,etc. And the Edge
Datacenter uses leaf-spin topology. There are three types in leaf:
distribution leaf, Server leaf and Board leaf. Server leaf is
connecting Server. Board leaf is the DGW providing DC
interconnection. Distribution leaf is the SGW in Figure 1. As a key
node in the Edge datacenter, Service Gateway will be elaborated in
the next clause.
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......
....( )....
. .
+->. Metro Network . .....
| ....( ).... ...( )...
| ...... . DCI .
| ...( )...
| .....
| ^
| |
********************************************************************
* | | *
* | +---------+ +---------+ | *
* | | | | | | *
* | | spin | | spin | | *
* | +---------+ +---------+ | *
* | / \ / \ | *
* | / \ / \ | *
* | / \ / \ | *
* +---------+ +---------+ +---------+ +---------+ *
--------------->| SGW |----| |----| |----| DGW | *
* | (leaf) | | leaf | | leaf | | (leaf) | *
* +---------+ +---------+ +---------+ +---------+ *
* | | | | *
* +------------------------------------------------------+ *
* | | *
* | VNF(vCPE, vBNG...) | *
* +------------------------------------------------------+ *
* Edge Datacenter(EDC) *
********************************************************************
Figure 1
3.1. Use case of the EDC
EDC is in the place that is closest to user. It may not have a large
scale, but because of its "edge" propoerty, it can meet most access
requirements from user.These EDC can get realtime data update through
WAN and core DC. By the EDC, we can not only avoid to tranmit lots
of duplicated data, but also let the users get the same service and
data as same as from core DC, but with better experience.
In this section, we will list 4 use cases of the EDC to make it
clear.
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3.1.1. Future video application
In this use case, all the video traffic are getted from EDC so that
the users can get better experience when they play games or watch
video,etc. EDC has the capability of abstract for elephant
traffic(IPTV), and support the extremely low latency video
application. Figure 2 is the diagram of this case.
+-------------+
| |
| EDC |
+-------------+
^
VR,AR,8K |
|
+-----------+
VR,AR,8k----------------------->| |
Internet----------------------->|Service GW |------------->Internet
+-----------+
Figure 2
3.1.2. Edge IOT control application
EDC has its own computational capbility, and getting more and more
intelligent. In the case that UAV( UnmannedAerialVehicle ), it needs
to communicate with the apps in EDC so that the UAV can be remote
controlled. Similar with other IOT control scenarios. Figure 3 is
the diagram of this case.
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+-------------------+
| |
| APP |
+-------------------+
/ \ Dynamical deploy
/ \
|/_ _\|
+---------------+ +---------------+
| EDC | | EDC |
| (App) | | (App) |
+---------------+ +---------------+
^ ^
| Control flow |
+---------------+ +---------------+
| Service GW | | Service GW |
| |--- | |---+--------->Internet
+---------------+ | +---------------+ |
^ | ^ |
| +-----------------|-----------+
| |
+---+ +---+
|UVA|------------------------->|UVA|
+---+ Fly to... +---+
Figure 3
3.1.3. Home Hybird Cloud
In this case, EDC is an extension of Home Gateway. Some expanded
computation or expanded store are extended into EDC instead of on
HGW. Even some APPs can also extened into EDC. Users can get more
applications, such as OTT white box, remote download, and remote
desktop, etc. Figure 4 is the diagram of this case.
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+------------------------+
| |
| EDC |
| (Expanded computation) |
| (Expaned store) |
| |
+------------------------+
^
+--------------+ |
APP1------------>| | |
APP2------------>| HGW | +-------------+
PC..............>| (Computation)|------------>| |
| (store) |............>| Service GW |...............>Internet
+--------------+ +-------------+
Figure 4
3.1.4. Light weight lease line based on application
In this use case, EDC is a control node for user 2/3 layer lease line
(VxLAN or MPLS). It can support dynamically setup the tunnel
according to application identification; support user private IP
address or address management, etc. Figure 5 is the diagram of this
case.
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+-----------+ +------------+ L2/3 lease line +------------------+
| | | |----------------->| |
| User GW |------------>| Service GW |-------+ | EDC |
+-----------+ +------------+ | | (Authentication) |
| | |
| | (DHCP) |
+-----------+ +------------+ | | |
| | | |-------|--------->| (Tunnel |
| User GW |------------>| Service GW |-----+ | | management) |
+-----------+ +------------+ | | | |
| | | (User Apps) |
| | | |
+-----------+ +------------+ | | | ..... |
| | | |-----|-|--------->| |
| User GW |------------>| Service GW |---+ | | | |
+-----------+ +------------+ | | | +------------------+
| | |
| | +------------------->
| +---------------------> Internet
+----------------------->
Figure 5
4. Service Gateway
From those use case above, we know that Service Gateway as a key node
in the forwarding plane, is a flow distribution device in Edge DC
network. It needs not only to support currently existing protocols,
but aslo to meet all kinds of new requirements, ie. SDN forwarding,
virtualization,SDN control, and spine-leaf network architecture,
dynamic SFC, etc. The main purpose of the Service Gateway is to
improve the forwarding, and converge or distribute traffic according
to different service. By the Service Gateway, we can avoid the
hairpin of the traffic to Metro network, and divide the traffic into
north-south traffic and south-east traffic clearly.
4.1. Functions
4.1.1. PPPoE proxy
To terminate PPPoE tunnel.
4.1.2. VxLAN encapsulation
Encapsulate the packets into Edge DC with VxLAN as VTEP. Provide
VxLAN mapping, forwarding, and interconnection with VLAN as a
gateway.
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4.1.3. C/S VLAN forwarding
Support QinQ VLAN forwarding, so that be compatible to traditional
network, and reduce the capacity of FDB.
4.1.4. Distribution
Achieve traffic distribution according to service VLAN. The
forwarding table on the SGW can be configurated by the SDN controller
with NATCONF or OFPCONFIG protocol.
Can implement linea forwarding based any field in IP header.
5. Conclusion
CO being re-architected as Edge DC is a very important step for
provider's evolving to SDN/NFV.
6. Security Considerations
Service Gateway must have the capability of checking the validation
of user's address.
7. IANA Considerations
N/A
8. Information References
[I-D.ietf-nvo3-arch]
Black, D., Hudson, J., Kreeger, L., Lasserre, M., and T.
Narten, "An Architecture for Data Center Network
Virtualization Overlays (NVO3)", draft-ietf-nvo3-arch-08
(work in progress), September 2016.
[I-D.ietf-nvo3-use-case]
Yong, L., Dunbar, L., Toy, M., Isaac, A., and V. Manral,
"Use Cases for Data Center Network Virtualization Overlay
Networks", draft-ietf-nvo3-use-case-12 (work in progress),
October 2016.
[RFC7365] Lasserre, M., Balus, F., Morin, T., Bitar, N., and Y.
Rekhter, "Framework for Data Center (DC) Network
Virtualization", RFC 7365, DOI 10.17487/RFC7365, October
2014, <http://www.rfc-editor.org/info/rfc7365>.
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Authors' Addresses
Ting Ao
ZTE Corporation
No.889, BiBo Road
Shanghai 201203
China
Phone: +86 21 68897642
Email: ao.ting@zte.com.cn
Zhonghua Chen
China Telecom
No.1835, South PuDong Road
Shanghai 201203
China
Phone: +86 18918588897
Email: 18918588897@189.cn
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