Browse Prior Art Database

IP ROUTER FAULT TOLERANCE IN THE iDEN PACKET DATA SYSTEM

IP.com Disclosure Number: IPCOM000008330D
Original Publication Date: 1997-Sep-01
Included in the Prior Art Database: 2002-Jun-06
Document File: 6 page(s) / 268K

Publishing Venue

Motorola

Related People

Ray F. Ciurej: AUTHOR [+4]

Abstract

The Packet Data feature within the iDEN system will be implemented using Mobile IP [RFC 20021. Mobile IP specifies the use of a Foreign Agent which provides tunnel endpoints for IP-in-IP encapsulated datagrams. In this system, the foreign network will correspond to an iDEN network. Each foreign agent may have several end- points and each of these endpoints correspond to IP networks. In the iDEN system, encapsulated datagrams that are delivered to these networks will be decapsulated at the foreign agent and will be delivered to Mobile IP hosts (subscriber units) using iDEN specific network and datalink mechanisms. In a large iDEN system, there will be multiple foreign agents each supporting multiple IP network end- points These IP networks must be advertised using a Router Interface Protocol just as any standard IP network would. Furthermore, these IP networks and their corresponding foreign agents must support a high degree of redundancy and fault tolerance. The iDEN system has adopted an N + 1 redundancy scheme for the foreign agents. Furthermore, the iDEN system will utilize standard routing protocols in unique ways to enhance IP network reachability and fault recovery. To meet the reliability require- ments of the iDEN packet data system, the Network Management function and IP network routing protocols must interact. This publication describes this interaction as well as unique techniques for IP advertising.

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MOTOROLA Technical Developments

IP ROUTER FAULT TOLERANCE IN THE iDEN PACKET DATA SYSTEM

by Ray F. Ciurej, Tomas Capurka, David Cong, Mark Hamlen

ABSTRACT

  The Packet Data feature within the iDEN system will be implemented using Mobile IP [RFC 20021. Mobile IP specifies the use of a Foreign Agent which provides tunnel endpoints for IP-in-IP encapsulated datagrams. In this system, the foreign network will correspond to an iDEN network. Each foreign agent may have several end- points and each of these endpoints correspond to IP networks. In the iDEN system, encapsulated datagrams that are delivered to these networks will be decapsulated at the foreign agent and will be delivered to Mobile IP hosts (subscriber units) using iDEN specific network and datalink mechanisms. In a large iDEN system, there will be multiple foreign

agents each supporting multiple IP network end- points These IP networks must be advertised using a Router Interface Protocol just as any standard IP network would. Furthermore, these IP networks and their corresponding foreign agents must support a high degree of redundancy and fault tolerance. The iDEN system has adopted an N + 1 redundancy scheme for the foreign agents. Furthermore, the iDEN system will utilize standard routing protocols in unique ways to enhance IP network reachability and fault recovery. To meet the reliability require- ments of the iDEN packet data system, the Network Management function and IP network routing protocols must interact. This publication describes this interaction as well as unique techniques for IP advertising.

145 September 1997

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MOIOROLA Technical Developments

SYSTEM DIAGRAM

The following figure describes the logical environment for the problem:

Internet

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Active

Network Manager (OMC)

C~ Motorola. Inc. 1997 146 September 1997

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Technical Developments

SYSTEM DESCRIPTION

  For the purposes of this discussion there are three essential components. First, the Interface Router (IR) is an industry standard IP router with a sufficient number of interfaces to support both the required number of foreign agents and, the necessary connections into a private (or public) intemetwork. Second, the foreign agents (MD&) are special purpose devices specific to the iDEN system. The MDGs must fully support the foreign agent requirements as defined by Mobile IP as well as the functionality needed to support iDEN network and data link connectivity. Third, the iDEN Network Manager (OMC) must have sufficient resources and functionality to monitor and modify the operational status of an MD.G or any links critical to the MDG's proper functioning. In the iDEN system, SNMP (over frame relay) is the chosen network management protocol.

  At system start-up, the Network Manager will configure each MDG. Among other things, the MDG configuration data will inc...