Limitation of Riverbed s Quality of Service (QoS)
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1 Application Note Limitation of Riverbed s Quality of Service (QoS) Riverbed s Quality of Service (QoS) configuration and limitations Juniper Networks, Inc North Mathilda Avenue Sunnyvale, California USA JUNIPER Part Number: May 2008
2 Table of Contents Introduction... 3 Scope Riverbed QoS Limitation Customer Example Juniper WX Platform Configuration Riverbed-Steelhead Configuration... 8 Summary About Juniper Networks Copyright 2008, Juniper Networks, Inc.
3 Introduction The goal of this document is to explain the limitations of the Riverbed QoS and how only Juniper Networks WAN application acceleration platforms (WX application acceleration platforms) reply to end-customer quality of service (QoS) needs. Scope This AppNote is targeted for Juniper and partner SEs, especially in competitive deals against Riverbed. Riverbed QoS Limitation Riverbed implements QoS, as routers do. You define the local office WAN bandwidth and configure how much outgoing WAN guaranteed bandwidth you want for different applications. This design works well for routers, but is not suited for WAN optimization appliances. With such a technical approach, you can hardly provide per-remote office guaranteed bandwidth. Enterprises don t want to guarantee X percent of their headquarters outgoing bandwidth for critical applications. What enterprises need is X percent of their remote offices incoming bandwidth for critical applications. The following example will demonstrate the complexity of the Riverbed QoS implementation and how it applies to real customer needs. Customer Example This example is a classic enterprise QoS requirement. You have two centralized critical applications FTP servers and file servers (they could be Siebel, SAP, Oracle and so on) and you want to guarantee 25 percent of your remote locations bandwidth for ftp and 10 percent for CIFS: Headquarters link: 10,000 Kbps (10 Mbps) 15 Remote sites: 1500 Kbps Goal: Allocate to each remote site Juniper WX Platform Configuration percent of remote office bandwidth for FTP traffic 10 percent of remote office bandwidth for CIFS traffic You can configure the QoS via the Setup Wizard or manually. The Setup Wizard does reply to a large number of requests. But this example requires a manual setup. Anyway, our manual setup is simple and easy. The configuration steps for this QoS requirement are as follows: 1. Set up the Outbound QoS Endpoints for the WX platform in the Headquarters. Select: QoS Templates. Copyright 2008, Juniper Networks, Inc. 3
4 Technical Note: You don t manually define the 15 locations (endpoints). They are automatically listed once the WX platform is registered to the registration server. What you define is simply: The local max WAN link (Outbound Speed) The max WAN link to remote locations with no WX platform (Other traffic Circuit Speed) Each remote max WAN link (remote endpoint Circuit Speed) 2. Define the ftp class for the application FTP and CIFS. Select: QoS Traffic Classes Edit Classes. 4 Copyright 2008, Juniper Networks, Inc.
5 3. Associate the application FTP to the class ftp and CIFS to the class CIFS. Select: QoS Traffic Classes. Technical Note: The WX platform proposes 53 predefined applications (such as FTP and CIFS). There is obviously the ability to create your own applications if they are not prelisted. The applications can be defined with Layer 3 information (IP addresses) and/or Layer 4 information (TCP/UDP ports) and even Layer 7 information (HTTP URL or Citrix application name). 4. Define the Class Template CompanyX-QoS with 25 percent guaranteed for the class ftp and 10 percent for the class CIFS. Select: QoS Templates New template. Technical Note: Priority definition is optional. The excess bandwidth not guaranteed (in that case bandwidth above 35 percent) will be used in high-priority for ftp Traffic Class, then CIFS and at last for the default traffic class. 5. Select the Class Template to the different endpoints. Select: QoS Overview. Copyright 2008, Juniper Networks, Inc. 5
6 Via the Edit button, select the template CompanyX-QoS for each remote location. In this example, the Other traffic (traffic with destination where there is no WX platform) remains without template, as we don t want to guarantee bandwidth for it. Technical Note: You can t allocate in guaranteed bandwidth more than 80 percent of the WAN bandwidth. In that example the WAN bandwidth is 10 Mbps => 8 Mbps as the max for the total guaranteed bandwidth. You can see via the WX WebUI how much you have already allocated by selecting the Show bandwidth as: Kbps. 6 Copyright 2008, Juniper Networks, Inc.
7 Technical Note: And in case you try to overallocate, a warning message will prevent the configuration change. Copyright 2008, Juniper Networks, Inc. 7
8 Riverbed-Steelhead Configuration Riverbed has no concept of remote locations. So you can t allocate a guaranteed bandwidth for a remote location. Riverbed proposes a real complex workaround with limited scalability. You have to create one QoS class with WAN guaranteed bandwidth per remote location/per application. And you have to apply the correct QoS class to each destination subnet. This means with Riverbed, you have to manually do the following: Calculate how much local WAN bandwidth percentage is each remote location s guaranteed bandwidth. Note: The Juniper WX platform detects each remote location WAN bandwidth. So you simply specify the percentage of remote location WAN bandwidth you want to guarantee. Gather each remote location s subnets. Note: Each Juniper WX platform automatically detects other Juniper WX platforms local subnets. So there is no need to manually define the remote locations subnets Create one QoS class per remote location and per application. Note: You simply create a single QoS template with the Juniper WX platform, whatever the number of remote locations and applications. Create a specific QoS rule per remote subnet and per application for each remote location. Note: You simply associate the QoS template to each remote location with the Juniper WX platform. And in that specific basic example you have to create manually: 30 QoS classes!!! There are 15 remote locations and 2 applications (ftp and CIFS): 15 x 2 = 30 QoS classes Note: The Riverbed high-end platforms support only up to 200 QoS classes. So Riverbed can t support more than 200 sites with 1 single application classified or 50 sites with 4 applications classified. For information, that was one single QoS template created on the Juniper WX platform. 90 QoS rules!!! There are 15 remote locations, 3 local subnets per location and 2 applications (FTP and CIFS): 15 x 3 x 2 = 90 QoS classes Note: The Riverbed high-end platforms support only up to 600 QoS rules. So Riverbed can t support more than 200 sites with 3 subnets and 1 single application classified or 50 sites with 3 subnets and 4 applications classified. For information, the 15 remote locations were simply associated with the QoS template on the Juniper WX platform. 8 Copyright 2008, Juniper Networks, Inc.
9 The configuration steps for Steelhead are as follows: Technical Note: The screenshots are based on the Riverbed RiOS Enable QoS and specify WAN bandwidth. Select: Setup Advanced Networking - QoS Classification 2. Create manually the 30 QoS classes: One for each remote location/application Manually repeat this 15 times for each 15 remote locations. Select: Setup Advanced Networking - QoS Classification Technical Note: Riverbed cannot determine the remote location bandwidth. So you have to manually calculate how much local bandwidth is 25 percent of the remote location bandwidth. In that case, 25 percent of 1.5 Mbps is 375 Kbps. And 375 Kbps is 3.75 percent of 10 Mbps. Copyright 2008, Juniper Networks, Inc. 9
10 Technical Note: Riverbed cannot determine the remote location bandwidth. So you have to manually calculate how much local bandwidth is 10 percent of the remote location bandwidth. In that case, 10 percent of 1.5 Mbps is 150 Kbps. And 150 Kbps is 1.5 percent of 10 Mbps. So at the end of the 30 QoS classes that were manually configured, you have the following: 10 Copyright 2008, Juniper Networks, Inc.
11 3. Create the port label for CIFS (TCP ). Riverbed doesn t have predefined applications. QoS rules (see next point) are based on source and destination IP and ports. In the case of CIFS application, two TCP ports are used: 139 and 445. To avoid the creation of two QoS rules for each CIFS rule, you can create a port label for CIFS. Select: Setup Port Labels 4. Create manually the 90 QoS rules: One for each remote subnet/application Manually repeat this 15 times for all 15 remote locations. Select: Setup Advanced Networking - QoS Classification Copyright 2008, Juniper Networks, Inc. 11
12 Those three QoS rules are for the application FTP. Note: The three subnets in the branch office 1 are /24, /24, and / Copyright 2008, Juniper Networks, Inc.
13 Those three QoS rules are for the application CIFS. Note: The three subnets in the branch office 1 are /24, /24, and /24. Copyright 2008, Juniper Networks, Inc. 13
14 Summary Even if both Juniper and Riverbed support QoS, this document explained how only Juniper can reply to QoS enterprise needs. For more information about the Riverbed solution and the Juniper advantages, you can look at the latest Riverbed competitive information available on the partner site: partners/partner_center/content/reseller/products/wan_kit.jsp#comp. About Juniper Networks Juniper Networks, Inc. is the leader in high-performance networking. Juniper offers a high-performance network infrastructure that creates a responsive and trusted environment for accelerating the deployment of services and applications over a single network. This fuels high-performance businesses. Additional information can be found at CORPORATE HEADQUARTERS AND SALES HEADQUARTERS FOR NORTH AND SOUTH AMERICA Juniper Networks, Inc North Mathilda Avenue Sunnyvale, CA USA Phone: 888.JUNIPER ( ) or Fax: EUROPE, MIDDLE EAST, AFRICA REGIONAL SALES HEADQUARTERS Juniper Networks (UK) Limited Building 1 Aviator Park Station Road Addlestone Surrey, KT15 2PG, U.K. Phone: 44.(0) Fax: 44.(0) EAST COAST OFFICE Juniper Networks, Inc. 10 Technology Park Drive Westford, MA USA Phone: Fax: ASIA PACIFIC REGIONAL SALES HEADQUARTERS Juniper Networks (Hong Kong) Ltd. 26/F, Cityplaza One 1111 King s Road Taikoo Shing, Hong Kong Phone: Fax: Copyright 2008 Juniper Networks, Inc. All rights reserved. Juniper Networks, the Juniper Networks logo, NetScreen, and ScreenOS are registered trademarks of Juniper Networks, Inc. in the United States and other countries. JUNOS and JUNOSe are trademarks of Juniper Networks, Inc. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners. Juniper Networks assumes no responsibility for any inaccuracies in this document. Juniper Networks reserves the right to change, modify, transfer, or otherwise revise this publication without notice. To purchase Juniper Networks solutions, please contact your Juniper Networks sales representative at or authorized reseller. 14
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