Appletalk Protocols; Seed Routers - 3Com CoreBuilder 2500 User Manual

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HAPTER OUTING WITH

Seed Routers

AppleTalk Protocols

OSI Reference Model
Application
Presentation
Session
Transport
Network
Data link
Physical
A T T
PPLE ALK ECHNOLOGY
A seed router initializes the intranet with AppleTalk configuration
information, including network numbers and zone names. The seed
router broadcasts this information so that nonseed routers can learn it.
You designate a seed router through the Administration Console.
A nonseed router listens for a seed router and takes configuration
information from the first one it detects. A nonseed router that obtains
configuration data participates in the network as if it is a seed router.
AppleTalk protocols ensure the flow of information through AppleTalk
networks. Figure 8-2 shows a simplified view of AppleTalk protocols and
their relationship to the OSI Reference Model. These protocols provide
physical connectivity, end-to-end network services, and data delivery.
AppleTalk
Data Stream
Protocol (ADSP)
Routing Table
Maintenance
Protocol (RTMP)
TokenTalk
Link Access
Protocol
Token ring
hardware
Figure 8-2 AppleTalk Protocols and the OSI Reference Model
The AppleTalk six-layer protocol suite does not fully comply with the OSI
seven-layer model. However, AppleTalk provides many of the functions
and services of OSI. AppleTalk has no specific protocols for the
Application layer because the lower levels provide printer and file service.
AppleTalk
Protocol (AFP)
AppleTalk
Zone
Information
Protocol (ASP)
Protocol (ZIP)
AppleTalk Echo
Transaction
Protocol (AEP)
Protocol (ATP)
Datagram Delivery Protocol (DDP)
EtherTalk
Link Access
Protocol
Ethernet
hardware
Filing PostScript
Printer Access
Session
Protocol (PAP)
AppleTalk
Name Binding
Protocol (NBP)
LocalTalk
Link Access
Protocol
LocalTalk
hardware