Information Technology Reference
In-Depth Information
Figure13-1 The VINES Protocol Stack
OSI
reference
model
VINES protocol
File
services
Print
services
Other
applications
7
StreetTalk
6
5
RPC
IPC
(datagram)
SPP
(stream)
4
ARP
RTP
ICP
3
VIP
2
Media-access protocols
1
VINES Media Access
The two lower layers of the VINES stack are implemented with a variety of well-known media-access
mechanisms, including High-Level Data Link Control (HDLC), Synchronous Data Link Control (SDLC)
and derivatives, X.25, Ethernet, and Token Ring.
The Network Layer
VINES uses the VINES Internetwork Protocol (VIP) to perform Layer 3 activities (including
internetwork routing). VINES also supports its own Address Resolution Protocol (ARP), its own version
of the Routing Information Protocol (RIP) called the Routing Table Protocol (RTP), and the Internet
Control Protocol (ICP), which provides exception handling and special routing cost information. ARP,
ICP, and RTP packets are encapsulated in a VIP header.
VIP
VINES network-layer addresses are 48-bit entities subdivided into network (32 bits) and subnetwork (16
bits) portions. The network number is better described as a server number because it is derived directly
from the server's key (a hardware module that identifies a unique number and the software options for
that server). The subnetwork portion of a VINES address is better described as a host number because
it is used to identify hosts on VINES networks. Figure 13-2 illustrates the VINES address format.
