Enterprise QoS Solution Reference Network Design Guide

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Teleworker V3PN QoS Considerations 6-26 ! interface Tunnel120 description VPN Pipe to V3PN Site#120 (T1 Link) bandwidth 1536 ip address 10.10.120.1 255.255.255.252 ip mtu 1420 service-policy output SHAPING-T1-TUNNEL ! Policy applied to tunnel int qos pre-classify ! Performance recommandation tunnel source 192.168.1.1 tunnel destination 192.168.2.2 crypto map VPN ! Teleworker V3PN QoS Considerations Enterprise QoS Solution Reference Network Design Guide Chapter 6 IPSec VPN QoS Design Organizations constantly are striving to reduce costs and improve productivity and employee retention. Teleworker solutions address these organizational objectives by giving employees the ability to work from home with compatible quality, functionality, performance, convenience, and security, as compared to working in an office location. Teleworker solutions that provide such functionality have been branded “enterprise class” by Cisco Marketing and are illustrated in Figure 6-17. Figure 6-17 Enterprise Teleworker Design IP Telephony Infrastructure V Central Site VPN Headend Routers IPSec Tunnel Service Provider Internet Broadband Provider Telecommuter solutions include these main benefits: Home VPN Router Home Office Increased productivity—On average, employees spend 60 percent of their time or less at their desks, yet this is where the bulk of investment is made in providing access to corporate applications. Providing similar services at an employee’s residence, for a relatively minor investment, significantly can increase productivity gains. Business resilience—Employees can be displaced from their normal workplace by natural events (such as winter storms, hurricanes, or earthquakes), health alerts (such as SARS), man-made events (such as travel restrictions or traffic conditions), or simply family-related events, such as sick children or home repairs. These disruptions significantly can impact an organization’s processes. Providing employees with central site–equivalent access to applications and services in geographically dispersed locations (such as home offices) creates a built-in back-up plan to keep business processes functioning in unforeseen circumstances. Cost savings—A traditional remote worker setup involves toll charges for dial-up and additional phone lines. Integrating services into a single, broadband-based connection can eliminate these charges while delivering superior overall connectivity performance. Version 3.3
Chapter 6 IPSec VPN QoS Design Version 3.3 Teleworker V3PN QoS Considerations Security—Demands for access to enterprise applications outside the campus are stretching the limits of security policies. Teleworking over IPSec VPNs offers inherent security provided by encryption of all traffic, including data, voice, and video. Also critical is integrating firewall and intrusion-detection capabilities, along with finding ways to easily accommodate both corporate and personal users who share a single broadband connection (the “spouse-and-children” concern, which will be discussed shortly). Employee recruitment and retention—In the past, enterprises recruited employees in the locations where corporate offices were located. Today enterprises need the flexibility of hiring skilled employees wherever the skills exist and need to integrate remote workers into geographically dispersed teams with access to equivalent corporate applications. Although QoS designs for IPSec V3PN teleworker scenarios share many of the same concerns of site-to-site V3PN scenarios, additional specific considerations relating to teleworker deployment models and broadband access technologies need to be taken into account. Teleworker Deployment Models Integrated Unit Model Enterprise teleworker deployment models must provide the following services: Basic services—These include NAT, DHCP, IP routing, and multiple Ethernet connections for home office devices and broadband connection (attachment to the WAN circuit cable, DSL, ISDN, or wireless network). QoS services—These include classification, prioritization, and, in some cases, shaping of traffic. VPN/security services—These include encryption of traffic to the main site and firewall functionality for the home office. Given these requirements, there are three main deployment models for Enterprise teleworker V3PN solutions, as illustrated in Figure 6-18. These include the Integrated Unit Model, the Dual-Unit Model, and the Integrated Unit + Access Model. Figure 6-18 Enterprise Teleworker Deployment Models Integrated Unit Model Dual Unit Model Integrated Unit + Access Model IP IP IP Router QoS, VPN VPN Device Router QoS, VPN Router QoS Broadband Access Device Service Provider Backbone Enterprise In the Integrated Unit Model, a single device (such as a Cisco 837 or 1700-series router) provides basic services, QoS services, and VPN/security services. Furthermore, the device connects directly to the broadband media. Enterprise QoS Solution Reference Network Design Guide 6-27
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Enterprise QoS Solution Reference Network Design Guide

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