& cplSiteName &

Tiered Cloud Services

Light Reading
Series Column
Light Reading

EXECUTIVE SUMMARY: Application-specific quality-of-service prioritization across the network is crucial for cloud services. Cisco's ASR9010 managed quality under congestion well, maintaining low latency for high-priority cloud service patterns while also not starving out low-priority cloud customer traffic.

Delivering quality in the cloud is a task that bears many building blocks. When considering the packet network alone, quality of service (QoS) is already a broad term that raises a number of design questions. What algorithms and policies are used to prioritize traffic? What traffic characteristics need to be expected? Is latency or loss more critical? In the cloud, one would expect three tiers (Gold, Silver and Bronze) of application traffic at minimum. In order to come up with realistic traffic patterns, we made a few assumptions.

In almost all cases -- whether business, mobile or residential services -- the traffic patterns are typically asymmetric. As compute platforms, cloud services are likely to generate more traffic than they receive. In effect, there will be little congestion on the switches connected towards the servers. The other direction -- from the virtual machines to the Internet -- will surely be used more heavily.

Generally, a healthy traffic mix is about one-third Gold traffic and 10-to-30-percent Silver traffic, with the remaining traffic filled by emulators.

In the short term, some cloud operators might have much configured gold (a.k.a. high-priority enterprise) traffic. Typically gold services are under-booked and in turn over-provisioned so this should not be a concern. It is more of an issue if there are too many lower-paying customers, who sign on easily, and become overpopulated.

Reviewing the standard network topology, we figured the congestion point would often be the ASR 9010, and the cloud traffic profile we designed -- with an overload of Bronze user traffic -- would fit just right for our use case. We only had to remove links between our data center and our core network in order to emulate the typical situation of having more bandwidth available in the data center than upstream toward the network.

In addition to prioritizing Gold tenants over Silver and Silver over Bronze, Cisco configured a percentage of bandwidth for each class to be guaranteed: 70 percent for Gold, 20 percent for Silver and 9 percent for Bronze bandwidth, so that no single class of customers could get completely blocked even if higher priority traffic aims to monopolize a link.

In order to evaluate the QoS prioritization efficiency, we undertook the following test steps.

Step 1: Transmit all north-bound and south-bound bidirectional traffic between the users and the data center from our data center traffic profile and verify that there is no loss, as a baseline. Check.

Step 2: Reduce the bandwidth available between the data center and the core network by removing all links between one of the two ASR 9010s, and removing one link from the second ASR 9010, to create a minimal amount of congestion. Only bronze customers were affected. Check.

Step 3: Remove another link from the remaining ASR 9010, leaving two links left, or 20Gbit/s upstream and downstream. This still left enough bandwidth for Gold and Silver traffic, and only affected Bronze customers, as expected. Check.

Step 4: Remove yet another link between the ASR 9010 and its upstream CRS-3 peer, leaving only a single 10-Gigabit Ethernet link remaining. At this point the Cisco team told us the router was experiencing fabric congestion due to the high congestion, thus not necessarily guaranteeing the dedicated percentages explained above, which are applied after the fabric. Nevertheless, Gold and Silver were forwarded within their dedicated percentages. We observed loss only on Bronze traffic.

Step 5: We then decreased bronze traffic to avoid fabric congestion, and increased Silver traffic to see if Bronze tenants would still get their dedicated 1 percent of traffic. They did.

We also checked to see if latency increased, particularly for Gold tenants, during the various congestion scenarios. The Gold latency remained consistent, as shown in the graph below:

In summary, the ASR9010 passed the three-tier prioritization tests.

Next Page: Unified Fabric (UF) – UCS Manager
Previous Page: FabricPath

Back to the Cisco Test Main Page

(0)  | 
Comment  | 
Print  | 
Newest First  |  Oldest First  |  Threaded View        ADD A COMMENT
Light Reading’s Upskill U is a FREE, interactive, online educational resource that delivers must-have education on themes that relate to the overall business transformation taking place in the communications industry.
Friday, October 28, 1:00PM EDT
Security: The Plusses and Minuses of Open Source Software
Nick Feamster, Acting Director, Center for Information Technology Policy, Princeton University
Wednesday, November 9, 1:00PM EST
MANO 101
Friday, November 11, 1:00PM EST
Open Source for NFV MANO
Wednesday, November 16, 1:00PM EST
SDN 101
John Isch, Practice Director, Network & Voice, Orange Business Services
in association with:
From The Founder
Light Reading today starts a new voyage as part of a larger Enterprise.
Flash Poll
Live Streaming Video
Charting the CSP's Future
Six different communications service providers join to debate their visions of the future CSP, following a landmark presentation from AT&T on its massive virtualization efforts and a look back on where the telecom industry has been and where it's going from two industry veterans.
LRTV Custom TV
OneAccess NFV Solutions

10|26|16   |   5:30   |   (0) comments

Antoine Clerget, CTO of OneAccess, discusses how his company has expanded its product line from enterprise-class routers to include a universal virtualized CPE as well as a suite of VNFs to help telco customers evolve to an NFV future.
LRTV Custom TV
The Journey Toward Carrier-Grade WiFi

10|26|16   |   3:39   |   (0) comments

In this Light Reading interview, Dave Sperling, CTO at Smith Micro Software and active participant of the WBA's policy working group, discusses the need for carrier-grade WiFi. Technical and business challenges slowing the fulfillment of this goal are addressed, as well as management strategies that will enable communication service providers to optimize end user ...
LRTV Custom TV
ZTE BBWF Highlights

10|26|16   |     |   (0) comments

At BBWF 2016, ZTE showed a broad range of innovative technologies that are kick-starting an ultrafast broadband journey.
LRTV Custom TV
Next-Generation Technology Beyond DOCSIS 3.1

10|20|16   |     |   (0) comments

At SCTE 2016, Huawei's Liu Jianhua speaks with Alan Breznick for an exclusive interview.
LRTV Custom TV
Hybrid Video Solutions to Change TV, Change Future

10|20|16   |     |   (0) comments

At SCTE 2016, Huawei's Ian Locke speaks with Alan Breznick for an exclusive interview.
LRTV Custom TV
Huawei Future-Oriented Giga Coax Network

10|20|16   |     |   (0) comments

At SCTE 2016, Huawei's Allen Wang speaks with Alan Breznick for an exclusive interview.
LRTV Custom TV
Huawei at SCTE 2016

10|20|16   |     |   (0) comments

Join Alan Breznick of Light Reading and take a sneak peek at the Huawei booth at SCTE 2016.
LRTV Custom TV
Assuring Network Quality in a Rapidly Changing Environment

10|20|16   |     |   (0) comments

As the rate of change and complexity increases in agile networks, the importance of introducing DevOps methodologies for integrating active test and assurance solutions throughout the full service lifecycle becomes critical to ensure that customers are experiencing the service quality they demand. The industry landscape is changing, and software-based test and ...
Telecom Innovators Video Showcase
A10 Networks on Service Providers' Industry Needs

10|20|16   |     |   (0) comments

Light Reading's Steve Saunders hears how A10 enables service providers to accelerate, secure and optimize their application delivery to drive down costs, enhance service availability, and better respond to customer requirements, so they can improve customer satisfaction, monetize their network, and grow revenues.
LRTV Custom TV
New NFV Use Cases for Cable TV

10|19|16   |     |   (0) comments

A large number of NFV use cases are focused on the enterprise domain, looking at virtualization of customer-premises equipment (CPE). To date, there has been little focus on the use cases and business case for virtualization of the video content delivery networks required to deliver unicast and streaming video to consumers. Amdocs commissioned Analysys Mason to ...
Women in Comms Introduction Videos
Meet the Future Workforce: New Faces, Expectations & Motivations

10|19|16   |   5:33   |   (1) comment

Millennials and their younger peers, Gen Z, expect more out of their network and more out of their work. Intel's Lynn Comp shares how the industry can prepare for this new generation of workers.
LRTV Custom TV
ZTE Global Services User Congress 2016 Highlights

10|19|16   |     |   (0) comments

ZTE held its 2nd Global Service User Conference in Dusseldorf on October 13-14. Representatives from network operators, leading industry analysts and ZTE senior expertsattended the event, exploring the best practice in managed services and the vision to transform network operations into the operations center of the future (OpCF) in the software-defined networking ...
Upcoming Live Events
November 3, 2016, The Montcalm Marble Arch, London
November 30, 2016, The Westin Times Square, New York City
December 1, 2016, The Westin Times Square, New York, NY
December 6-8, 2016, The Westin Excelsior, Rome
May 16-17, 2017, Austin Convention Center, Austin, TX
All Upcoming Live Events
Hot Topics
Attacks Have Major Internet Sites on the Ropes
Brian Santo, Senior editor, Test & Measurement / Components, Light Reading, 10/21/2016
Trump: Dump AT&T/TW & Comcast/NBC
Alan Breznick, Cable/Video Practice Leader, Light Reading, 10/24/2016
Google Fiber Hits Pause Button, Scales Back
Alan Breznick, Cable/Video Practice Leader, Light Reading, 10/26/2016
T-Mobile: AT&T & TW Means Ma Bell Not Focused on Mobile
Dan Jones, Mobile Editor, 10/24/2016
Layer3 TV Comes to Town, Hints at Future
Mari Silbey, Senior Editor, Cable/Video, 10/21/2016
Like Us on Facebook
Twitter Feed
BETWEEN THE CEOs - Executive Interviews
Join us for an in-depth interview between Steve Saunders of Light Reading and Alexis Black Bjorlin of Intel as they discuss the release of the company's Silicon Photonics platform, its performance, long-term prospects, customer expectations and much more.
There's no question that, come 2020, 5G technology will turn the world's conception of what mobile networking is on its head. Within the world of 5G development, Dr. ...
Animals with Phones
'Oh, Were You Looking for This?' Click Here
'I was just playing some games...'
Live Digital Audio

A vital part of increasing the number of women in comms is transforming the ways companies can support and empower women. While progressive company policies that support both men and women in achieving work-life balance are a step in the right direction, creating a company culture that supports those policies can at times be more challenging.

During this show, we'll talk to Lynn Comp, Senior Director of Industry and Sales Enabling (ISE) in the Network Platforms Group at Intel, about why those challenges exist and how companies can overcome them. She'll provide insight into how Intel has worked to create a culture that supports work-life balance, and provide steps and guidance for other companies wishing to do the same. We will also leave plenty of time to get your questions answered live on the air.