Chapter10.ISDN Design Solutions


Chapter 10. ISDN Design Solutions

Typically, the hub and spoke design is the most commonly used in remote access solutions. The hub and spoke terminology can be used for ISDN design solutions; however, it is more common for designers to use network access server (NAS) and remote node as typical terms that describe the design. Typically, the hub site is referred to as the core or core router, and the spoke side is referred to as the end-user router, or remote user .

The objectives of this chapter are to give you more information about the typical ISDN design solutions. The main topics of the chapter can be summarized as follows :

  • Enterprise and Internet service provider (ISP) design

  • Setting the ISDN switch type, service profile identifiers (SPIDs) and local directory numbers (LDNs)

  • Network address translation (NAT) and Port Address Translation (PAT)

  • Per-user (per function) design, virtual templates, and profiles

  • Multilink Point-to-Point Protocol (MLP)

  • Multichassis Multilink PPP (MMP)

Hub and spoke design, typical for remote access ISDN (see Figure 10-1), is beneficial because of increased manageability and the capability to apply policies to the environment. In this design, the core router is usually connected to two switches that provide the necessary redundancy for remote users who are accessing the company's intranet. At the same time, the core router can be a single point of failure, which raises questions about availability and scalability, and bandwidth aggregation.

Figure 10-1. Hub and Spoke Design for a Remote Access Environment





Troubleshooting Remote Access Networks CCIE Professional Development
Troubleshooting Remote Access Networks (CCIE Professional Development)
ISBN: 1587050765
EAN: 2147483647
Year: 2002
Pages: 235

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