Compatible-systems 5.4 Manuel d'utilisateur télécharger pdf (Page 288)

282 Appendices

Each group of devices is assigned a unique “network number” which repre-

sents that particular group to all of the routers on the network. Packets which

are sent between members of the same group are simply sent directly from

one member to another.

Packets which must go between devices belonging to two different groups

travel through routers, which forward them along an optimal path.

By examining the destination network number in a packet that must be

forwarded, and by using information that routers automatically pass between

themselves in IPX Routing Information Protocol (RIP) packets, any router

can determine the optimal path for forwarding packets from one group to

another.

This scheme relies on the fact that each segment is assigned a unique network

number. If not, the routers have no way of knowing which of the physical

segments with that number should actually receive a packet.

IPX Routing Example

Among routable network protocols, IPX is relatively simple. Each physical

network segment is assigned a network number by the routers on the segment.

The network number can be in the range of 1 to FFFFFFFE (that’s 8 hexadec-

imal digits). In the diagram above, 100 and 10C01 are the network numbers

for the two segments shown.

Establishing the network number for an IPX network segment is referred to

as “seeding” the network. You should generally only have one seed router per

Backbone

ocal Net

outer

Workstation

Net: 100

Net: 10C01

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Compatible-systems 5.4 Manuel d'utilisateur Page 288