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13-4 MAX 6000/3000 Network Configuration Guide
AppleTalk Routing
Introduction to AppleTalk routing
MAX units and AppleTalk nodes
Figure 13-2 illustrates a connection between a workstation acting as an AppleTalk node
connected to a MAX that is connected to another MAX over a synchronous PPP WAN
connection.
Figure 13-2. Routed connection
Following is a brief description of how a workstation user sees a typical AppleTalk connection.
The steps describe in a general way what is happening as the user makes the choices that lead
to a connection:
1 An AppleTalk workstation user opens the Macintosh Chooser for the first time since it has
been attached to the router and configured.
2 The workstation sends a ZIP Query to obtain an updated zone list from the local MAX,
and the MAX returns the updated zone list. This list might contain different zones than did
the initial list.
3 The user selects a zone and a specific device in the Chooser.
4 The workstation sends a Name Binding Protocol (NBP) Broadcast Request to the local,
which checks its Zone Information Table (ZIT) to identify the subnetwork to which the
printer is connected, and sends the request to the remote MAX via the port configured in
the Connection profile.
5 The remote MAX determines the port to which the subnetwork is attached and performs
the lookup in the appropriate multicast address (multicast addresses are assigned to
zones).
6 All devices in the appropriate zone on the subnetwork detect and process the NBP Lookup
packet.
7 The selected printer obtains the sender’s address from the Lookup packet (in this case the
routers are forwarders and the workstation is the sender) and sends the reply through the
routers to the workstation.
8 The user sends the print job to the printer.
9 When the print job is complete and no data packets are passing through the connection, the
MAX units continue to pass routing information.
AppleTalk
printer
AppleTalk
workstations
WAN
Local MAX
Remote
MAX