Compatible Systems 5.4 Manuale Utente
Appendices
285
AppleTalk Routing Example
Each AppleTalk physical network segment is assigned a network
number/range by the routers on the segment. The network number (or range
of numbers) can be between 1 and 65,279. In the diagram above, 100-200 is
the network range for the backbone, and 1001 is the network number for the
local net segment.
number/range by the routers on the segment. The network number (or range
of numbers) can be between 1 and 65,279. In the diagram above, 100-200 is
the network range for the backbone, and 1001 is the network number for the
local net segment.
Non-extended and Extended AppleTalk Networks
The original AppleTalk specification, which is now referred to as AppleTalk
Phase 1, used only a network number, not a network range. A network
number was a sixteen bit value, which allowed numbers between 1 and
65,534 to be used. The address of an individual device on the segment
consisted of the network number, along with an 8 bit node address value. This
scheme meant there could be a maximum of 254 devices per network
segment. While this was more than adequate for LocalTalk networks, it was
a major constraint on Ethernet networks.
Phase 1, used only a network number, not a network range. A network
number was a sixteen bit value, which allowed numbers between 1 and
65,534 to be used. The address of an individual device on the segment
consisted of the network number, along with an 8 bit node address value. This
scheme meant there could be a maximum of 254 devices per network
segment. While this was more than adequate for LocalTalk networks, it was
a major constraint on Ethernet networks.
AppleTalk Phase 2 introduced the concept of extended networks. While the
node address remained an 8 bit number, network segments could now be
identified by a range of network numbers between 1 and 65,279. Each
number in the range allows 253 node addresses. These Phase 2 extended
ranges should be used for all new AppleTalk installations.
node address remained an 8 bit number, network segments could now be
identified by a range of network numbers between 1 and 65,279. Each
number in the range allows 253 node addresses. These Phase 2 extended
ranges should be used for all new AppleTalk installations.
“Seeding” a Network Segment
Establishing the network number/range for an AppleTalk network segment is
referred to as “seeding” the network. You should generally only have one
referred to as “seeding” the network. You should generally only have one
Backbone
Local
Net
Router
Workstation
Workstation
Net: 100-200
Net: 1001