Avaya Configuring AppleTalk Services Bedienungsanleitung Seite 29

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AppleTalk Overview
117366-A Rev. A 1-13
Name Binding Protocol (NBP)
Macintosh users on an AppleTalk network refer to services by name, rather than
by physical location. For example, if you want to locate a printer, select the
Chooser and then pick the printer by name, rather than by its AppleTalk address.
The Bay Networks AppleTalk router uses the Name Binding Protocol (NBP) and
the Zone Information Protocol to map names of services to AppleTalk addresses.
When the router receives an NBP Broadcast Request packet for a named entity
from an AppleTalk node, it refers to its zone list to see in which network the
requested entity’s zone is located. If the zone is on the local network, it broadcasts
an NBP Lookup Request packet. If the zone is located on a different network, it
sends out an NBP Forward Request packet toward the router connected to the
network with the destination zone. Upon receiving a forward request, that router
then broadcasts an NBP Lookup Request (F
igure 1-8).
Figure 1-8. NBP Packets
NBP Broadcast Request
Function
NBP ID
NBP Tuple
1
NBP Lookup Request, and
NBP Forward Reply
Function = 1 = BrRq
Function = 2 = LkUpRq
Function = 3 = FwdRq
NBP Lookup Reply
Function
NBP ID
NBP Tuple 1
Tuple Count
NBP Tuple 2
NBP Tuple 3
APT0008A
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