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Browse Prior Art Database

METHOD OF ACCEPTING AND REJECTING NEW DEVICES ON A NETWORK

IP.com Disclosure Number: IPCOM000008858D
Original Publication Date: 1998-Sep-01
Included in the Prior Art Database: 2002-Jul-18
Document File: 4 page(s) / 167K

Publishing Venue

Motorola

Related People

Frank Korinek: AUTHOR [+3]

Abstract

Adding a mis-configured device to a cell site's Local Area Network (LAN) can adversely affect communications at the site by causing a degradation in voice and data services. Normal maintenance at a cell site may consist of (1) replacing a failed device on the site's LAN and (2) adding a new device to the site's LAN. When either of these two activities introduces a device with a duplicate or invalid phys- ical layer address, the mis-configured device is a potential source of problems. A method is described which automatically detects and prevents the accep- tance of such a device on the site's LAN. In addi- tion, this method provides a means to add a properly configured device without negative impact at the cell site.

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Page 1 of 4

0 M

MO7'OROLA Technical Developments

METHOD OF ACCEPTING AND REJECTING NEW DEVICES

ON A NETWORK

by Frank Korinek, Anatoly Agulnik and Dominic Lazara

INTRODUCTION

  Adding a mis-configured device to a cell site's Local Area Network (LAN) can adversely affect communications at the site by causing a degradation in voice and data services. Normal maintenance at a cell site may consist of (1) replacing a failed device on the site's LAN and (2) adding a new device to the site's LAN. When either of these two activities introduces a device with a duplicate or invalid phys- ical layer address, the mis-configured device is a potential source of problems. A method is described which automatically detects and prevents the accep- tance of such a device on the site's LAN. In addi- tion, this method provides a means to add a properly

configured device without negative impact at the cell site.

  In the description that follows, the cell site's LAN consists of (I) a Central Device (CD) that con- tains a list of configured IDS for all other devices on the network, and (2) one or more Subordinate Devices (SD) each of which is configured with one ID from the list. The physical of Medium Access Control (MAC) address to each device is not known to the other prior to connecting the device to the LAN. The method builds upon the prior art of Address Resolution Protocol (ARP) and Reverse Address Resolution Protocol (RARP) by rejecting mis-configured devices in addition to the process used to discover physical layer addresses.

DESCRIPTION

Case 1 - SD1 and SD2 attempt to register with the same ID but unique MAC

SD1 SD2 CD

Registration ( AC = a. ID = x) Registration A ept (MAC = c)

0 McmlOk,. 1°C. ,998 132 September 1998

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MOTOROLA Technical Developments

Step 1. SD1 is configured with MAC a and ID x when it registers. CD is configured with MAC c.

Step 2. CD receives Registration and checks validity of MAC and ID. CD determines MAC a and ID x are valid. CD checks if an SD with either MAC a or ID x has previously registered. CD determines neither MAC a nor ID x are in use, and accepts the registration by sending a Registration Accept to SDI. SD1 is initialized and brought into service.

Step 3. SD2 is configured with MAC b and ID x. SD2 attempts to register with CD

Step 4. CD receives Registration and checks validity of MAC a and ID x. CD determines MAC c and ID x are valid. CD determines ID x is already in use by another SD, and rejects the registration by sending no reply to SD2.

Step 5. SD2 times out waiting for Registration Accept and re-sends Registration. Steps 4-5 are repeated until SD2 is properly configured.

Case 2 - SD1 and SD2 attempt to register with the same MAC but unique ID

SD1 SD2 CD

Registration (N AC = a, ID = x) Registration Accept (MAC = c)

b

       RegLstration (MAC = a, ID = yb Reset (h &2= a)
o-

0

Step 1. SD1 is configured with MAC (I and ID x when it registers. CD is configured wit...