>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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