Network Working Group F. Yang
Internet-Draft W. Cheng
Intended status: Informational China Mobile
Expires: March 11, 2021 S. Peng
Z. Li
Huawei
September 7, 2020
Usage scenarios of Application-aware Networking (APN) for SD-WAN
draft-yang-apn-sd-wan-usecase-00
Abstract
This document describes the usage of Application-aware Networking
(APN) in SD-WAN scenarios. In these scenarios, APN is able to
identify a particular application, steer its traffic flows along
explicit path across the network, and provide SLA guaranteed network
services such as low latency and high reliability.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on March 11, 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
Yang, et al. Expires March 11, 2021 [Page 1]
Internet-Draft APN for SD-WAN September 2020
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Usage Scenarios of APN for SD-WAN . . . . . . . . . . . . . . 3
2.1. APN for Traffic Steering into Dedicated WAN . . . . . . . 3
2.2. APN for Traffic Steering into Particular Cloud . . . . . 3
2.3. APN for Value-added Service Provisioning in SD-WAN . . . 4
2.4. APN for Data Processing in SD-WAN . . . . . . . . . . . . 4
3. Business Model of APN enhanced SD-WAN . . . . . . . . . . . . 5
4. Security Considerations . . . . . . . . . . . . . . . . . . . 5
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
6. Normative References . . . . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
As more and more applications are moved to the cloud, the traditional
WAN architecture starts facing challenges. Software-defined Wide
Area Network (SD-WAN) provides a cloud-friendly way of
interconnecting branch offices and applications in the cloud over any
combination of transport services such as MPLS and 4G LTE, which is
able to optimising application performance with low costs.
Application-aware Networking (APN) is introduced in
[I-D.li-apn-framework] and [I-D.li-apn-problem-statement-usecases].
APN conveys application information such as application/user/flow
identifiers and SLA/service requirements along data packets into
network [I-D.li-6man-app-aware-ipv6-network] and make the network
aware of applications and their requirements, so to provide
corresponding network services and guarantee their SLA requirements.
The ever-emerging network services such as network slicing and iOAM
can be further enhanced with the application awareness in the network
enabled by APN.
This document describes the usage scenarios of APN for SD-WAN.
Yang, et al. Expires March 11, 2021 [Page 2]
Internet-Draft APN for SD-WAN September 2020
2. Usage Scenarios of APN for SD-WAN
This section describes the scenarios that can use APN to meet the
fine-granularity service operations in SD-WAN.
2.1. APN for Traffic Steering into Dedicated WAN
In CPE, different applications can be recognized and their traffic
flows can be steered into different WANs that can guarantee their
corresponding SLA requirements.
+------+ +-----------+ +------+
| APP1 | /------| WAN1 |------\ | APP1 |
+------+ / +-----------+ \ +------+
+------+ +-------+ +-----------+ +--------+ +------+
| APP2 |-----| CPE |------| WAN2 |------| CPE |-----| APP2 |
+------+ +-------+ +-----------+ +--------+ +------+
+------+ \ +-----------+ / +------+
| APP3 | \------| WAN3 |------/ | APP3 |
+------+ +-----------+ +------+
Traffic Steering into WAN
2.2. APN for Traffic Steering into Particular Cloud
In the multi-cloud scenario, a CPE can be deployed by an enterprise
as its gateway to access different clouds. In the CPE (e.g. an
universial CPE, called uCPE), different applications can be
recogonized and steered into the corresponding cloud where the
application servers are running through the corresponding WANs.
Yang, et al. Expires March 11, 2021 [Page 3]
Internet-Draft APN for SD-WAN September 2020
+------+ +-----------+ +----------+
| APP1 | /---------| WAN1 |-----| Cloud1 |
+------+ / +-----------+ +----------+
+------+ +--------+ +-----------+ +----------+
| APP2 |-----| CPE |-----| WAN2 |-----| Cloud2 |
+------+ +--------+ +-----------+ +----------+
+------+ \ +-----------+ +----------+
| APP3 | \---------| WAN3 |-----| Cloud3 |
+------+ +-----------+ +----------+
Traffic Steering into Cloud
2.3. APN for Value-added Service Provisioning in SD-WAN
APN can faciliate the value-added service provisioning in SD-WAN,
either at the CPE or the POP.
At the CPE, network security and application acceleration services
can be provided. With APN, certain malicious applications can be
recogonized and blocked, while the traffic from the applications that
require acceleration can be steered through the acceleration service.
At the POP, value-added service can be provisioned for certain
applications according to the application information carried in
their packets.
+------------+
|POP(VAS/SFC)|
+------------+
|
+-----+ +------------+ +------------+ +------------+ +-----+
| APP |----|CPE(VAS/SFC)|-----| WAN |-----|CPE(VAS/SFC)|-----| APP |
+-----+ +------------+ +------------+ +------------+ +-----+
VAS Provisioning
2.4. APN for Data Processing in SD-WAN
In enterprise, usually important data is kept locally and it is
preferred to be processed locally, while other data can be processed
with the complex processing capabilities in the cloud.
Yang, et al. Expires March 11, 2021 [Page 4]
Internet-Draft APN for SD-WAN September 2020
With APN, the traffic can be steered according to the localization
characteristics of the data, either being processed locally or in the
cloud.
+------+ +-------+ +------------+ +------------------+
| Data |-----| CPE |-----| WAN |-----| Cloud (Computing)|
+------+ +-------+ +------------+ +------------------+
\
\ +---------------------------+
--- | Local DC (Data Processing)|
+---------------------------+
Data Processing
3. Business Model of APN enhanced SD-WAN
With the digital transformation, the network infrastructure and
cloud-based applications are emerging as an integrated service of
network operators to provide a complete solution to customer. As an
overlay technology, SD-WAN is able to simplify the network and make
it more service-focused, which has become the de facto option for the
Enterprise WAN Edge. With SD-WAN, the network is not just a pipe any
more, and network becomes application aware. It enables the network
service providers to reshape their network to provide more complex
products to meet customers' various requirements.
When SD-WAN is integrated with APN, service providers are able to
provide network services together with cloud services in a fine-
granularity SaaS-like model. The latest functionalities can be
delivered via cloud. Customers benefit from the pay-for-use model in
per application granularity and have the agility to adjust the level
of functionality, capability, and capacity. According to the
application-aware information carried by the important applications,
corresponding paths/WANs can be selected, the SLA can be guaranteed,
and value-added services can be provisioned.
4. Security Considerations
The security consideration can refer to [I-D.li-apn-framework] .
Yang, et al. Expires March 11, 2021 [Page 5]
Internet-Draft APN for SD-WAN September 2020
5. IANA Considerations
There are no IANA considerations in this document.
6. Normative References
[I-D.li-6man-app-aware-ipv6-network]
Li, Z., Peng, S., Li, C., Xie, C., Voyer, D., Li, X., Liu,
P., Liu, C., and K. Ebisawa, "Application-aware IPv6
Networking (APN6) Encapsulation", draft-li-6man-app-aware-
ipv6-network-02 (work in progress), July 2020.
[I-D.li-apn-framework]
Li, Z., Peng, S., Voyer, D., Li, C., Geng, L., Cao, C.,
Ebisawa, K., Previdi, S., and J. Guichard, "Application-
aware Networking (APN) Framework", draft-li-apn-
framework-00 (work in progress), March 2020.
[I-D.li-apn-problem-statement-usecases]
Li, Z., Peng, S., Voyer, D., Xie, C., Liu, P., Qin, Z.,
Ebisawa, K., Previdi, S., and J. Guichard, "Problem
Statement and Use Cases of Application-aware Networking
(APN)", draft-li-apn-problem-statement-usecases-00 (work
in progress), March 2020.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
Authors' Addresses
Feng Yang
China Mobile
Beijing
China
Email: yangfeng@chinamobile.com
Weiqiang Cheng
China Mobile
Beijing
China
Email: chengweiqiang@chinamobile.com
Yang, et al. Expires March 11, 2021 [Page 6]
Internet-Draft APN for SD-WAN September 2020
Shuping Peng
Huawei
Beijing
China
Email: pengshuping@huawei.com
Zhenbin Li
Huawei
Beijing
China
Email: lizhenbin@huawei.com
Yang, et al. Expires March 11, 2021 [Page 7]