Light Reading
In this test, we check application-specific quality-of-service prioritization across the network – a crucial capability for cloud services

Tiered Cloud Services

Light Reading
Series Column
Light Reading
1/29/2012
50%
50%

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
Flash Poll
Wagner’s Ring
Data Centers Drive Telcos Into the Future

8|28|14   |   2:20   |   (2) comments


Data centers are at the heart of key trends driving telecom -- network virtualization, the drive for increased agility, and the need to compete with OTT providers.
LRTV Custom TV
Why SPs Should Consider Cisco's EPN

8|27|14   |   5:40   |   (0) comments


Sultan Dawood from Cisco discusses Cisco's EPN, which enables SPs to build agile and programmable networks delivering new network virtualized services using Cisco's Evolved Services Platform (ESP).
LRTV Huawei Video Resource Center
Huawei’s Showcase @ Big Telecom Event 2014

8|26|14   |   2.56   |   (0) comments


SoftCOM is Huawei's framework for telecom business and network transformation. Haofei Liu, Solution Marketing Manager, Carrier Business Group, Huawei, showcases Huawei's SoftCOM architecture in this video.
LRTV Huawei Video Resource Center
Huawei @ BTE 2014: Director of Integrated Solutions on SoftCOM & NFV Monetization

8|26|14   |   4.43   |   (0) comments


Libin Dai, Director of Integrated Solutions, Carrier Business Group, discusses Huawei's SoftCOM and NFV monetization. Huawei believes that NFV monetization should be service-driven rather than network-driven, and that operators should have network transformation, service transformation and a compatible and collaborative ecosystem in place in order to deploy NFV.
LRTV Huawei Video Resource Center
Huawei @ BTE 2014: Director of US NFV Lab on CloudEdge & the Future of NFV

8|26|14   |   4.06   |   (0) comments


Sean Chen, Director of US NFV Lab at Huawei, discusses Huawei's new approach to NFV in open collaboration. Huawei believes that through Proof of Concept tests, it could help operators learn and communicate with the industry more effectively. Sean believes that successful implementation of NFV should have its values reaching to end users and discusses how Huawei's ...
LRTV Huawei Video Resource Center
Huawei's Highlights @ Big Telecom Event 2014

8|26|14   |   3.34   |   (0) comments


At the Big Telecom Event in Chicago Huawei showcases its high-level strategy, the SoftCOM architecture, which helps operators reduce the cost of ownership of their network infrastructure and generate additional revenue in the ICT service environment. Huawei showcases over 30 pilot programs from across the globe, focusing on the industry-leading commercial ...
LRTV Custom TV
VeEX – Live from the Show

8|21|14   |   5:58   |   (0) comments


An overview of VeEX Test and Measurement solutions including TX300S multi-service test set with VeExpress cloud-based management system, UX400 universal modular platform supporting 100G testing, and the redesigned RXT modular platform.
LRTV Custom TV
Transitioning CE 2.0 Networks Into the SDN & NFV Era With Telco Systems

8|19|14   |   5:19   |   (0) comments


Telco Systems' Ariel Efrati (CEO) and Moshe Shimon (VP of Product Management) discuss virtualization and how the company's new Open Metro Edge solution utilizes the SDN and NFV concepts to accelerate and orchestrate service delivery through its innovative product portfolio and software applications.
LRTV Custom TV
NFV Myths: Is NFV Still Several Years Away?

8|11|14   |   1:13   |   (0) comments


Some say that NFV (network functions virtualization) is still several years away from being implemented on mobile operator networks. This isn't the case. Operators can get started on their paths to NFV now, as this short video from Skyfire shows.
LRTV Custom TV
A New Security Paradigm in SDN/NFV

7|28|14   |   02:54   |   (0) comments


Paul Shaneck, Global Director Network Solutions for Symantec, discusses the evolving virtualized network, explaining how Symantec is leading the security discussion as it relates to SDN and NFV, and helping to ensure the network is protected and compliant.
LRTV Documentaries
Sprint's Network Evolution

7|24|14   |   14:59   |   (0) comments


Sprint's Jay Bluhm gives a keynote speech at the Big Telecom Event (BTE) about Sprint's network and services evolution strategy, including Spark.
LRTV Documentaries
BTE Keynote: The Software-Defined Operator

7|24|14   |   18:43   |   (1) comment


Deutsche Telekom's Axel Clauberg explains the concept of the software-defined operator to the Big Telecom Event (BTE) crowd.
Upcoming Live Events!!
September 16, 2014, Santa Clara, CA
September 16, 2014, Santa Clara, CA
September 23, 2014, Denver, CO
October 29, 2014, New York City
November 6, 2014, Santa Clara
November 11, 2014, Atlanta, GA
December 9-10, 2014, Reykjavik, Iceland
June 9-10, 2015, Chicago, IL
Infographics
Hot Topics
Rogers, Shaw Take Aim at Netflix
Mari Silbey, Independent Technology Editor, 8/26/2014
Utilities to Pump $11.2B Into Smart Grid – Study
Jason Meyers, Senior Editor, Utility Communications/IoT, 8/26/2014
Verizon Launches QR Code Security Solution
Carol Wilson, Editor-at-large, 8/26/2014
M2M's In Fashion: Wearables Play the US Open
Sarah Reedy, Senior Editor, 8/25/2014
Verizon to Launch HD VoLTE in 'Coming Weeks'
Sarah Reedy, Senior Editor, 8/26/2014
Like Us on Facebook
Twitter Feed