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Re: Heirarchical Addressing posted 03/12/1999
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>OK, thank you Howard, I do understand. Now could you explain how/if this
>applies to IPX addressing?
>
>Thanks,
>
>Chad Marsh

  IF IPX network equal to mine
      THEN send to host using the MAC address low-order part of the IPX address
      ELSE send to a router identified by hearing IPX RIP from it.

NLSP does allow aggregation of networks into higher levels, but this isn't
widely used.

>
>
>
>"Howard C. Berkowitz" wrote:
>>
>> Think of the world's largest network -- the global telephone system.
>>
>> A full telephone number, on a worldwide basis, begins with a country code.
>> In the North American system, the full hierarchy is:
>>
>>      country code
>>      area code
>>      exchange
>>      line
>>
>> A given telephone switch first looks at a number and goes through this
>>logic:
>>
>>    IF country not equal to mine
>>       THEN send call to international carrier
>>       ELSE IF  area code not equal to mine
>>           THEN send call to interexchange carrier
>>           ELSE IF exchange not equal to mine
>>                THEN send call to other local exchange
>>                ELSE send call to appropriate line
>>
>> No single telephone switch knows how to get to each level in this
>> hierarchy.  Hierarchical network addressing deals with at least two levels:
>>
>>    IF network equal to mine
>>       THEN send to host
>>       ELSE send to default router
>>
>> Adding hierarchy, using OSPF terms,
>>
>>       IF network equal to mine
>>       THEN send to host
>>       ELSE send to default router
>>             On Default router
>>                IF intra-area route known send to next hop router in area
>>                  ELSE send to next hop to area border router advertising
>>                       the destination
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