|
Banyan VINES was a computer network operating system and the set of computer network protocols it used to connect to client machines on the network. The name was an acronym for ''Virtual Integrated Network Service''. Banyan Systems ran as a collection of services on top of AT&T System 5 Unix, and based its core network protocols on the archetypical Xerox XNS stack. VINES was one of a group of XNS-based systems that also included Novell NetWare. It has since disappeared from the market, along with Banyan Systems. James Allchin, who later worked as Group Vice President for Platforms at Microsoft Corporation until his retirement on January 30, 2007, was the chief architect of Banyan VINES. == VINES technology == VINES ran on a low-level protocol known as ''VIP''—the ''VINES Internetwork Protocol''—that was essentially identical to the lower layers of XNS. Addresses consisted of a 32-bit address and a 16-bit subnet that mapped to the 48-bit Ethernet address to route to machines. This meant that, like other XNS-based systems, VINES could only support a two-level internet. A set of routing algorithms, however, set VINES apart from other XNS systems at this level. The key differentiator, ''ARP'' (''Address Resolution Protocol''), allowed VINES clients to automatically set up their own network addresses. When a client first booted up it broadcast a request on the subnet asking for servers, which would respond with suggested addresses. The client would use the first to respond, although the servers could hand off "better" routing instructions to the client if the network changed. The overall concept very much resembled AppleTalk's AARP system, with the exception that VINES required at least one server, whereas AARP functioned completely "headlessly". Like AARP, VINES required an inherently "chatty" network, sending updates about the status of clients to other servers on the internetwork. Rounding out its lower-level system, VINES used ''RTP'' (the ''Routing Table Protocol''), a low-overhead message system for passing around information about changes to the routing, and ARP to determine the address of other nodes on the system. These closely resembled the similar systems used in other XNS-based protocols. VINES also included ''ICP'' (the ''Internet Control Protocol''), which it used to pass error-messages and metrics. At the middle layer level, VINES used fairly standard software. The ''unreliable datagram service'' and ''data-stream service'' operated essentially identically to UDP and TCP on top of IP. However VINES also added a ''reliable message service'' as well, a sort of hybrid of the two that offered guaranteed delivery of a single packet. Banyan offered customers TCP/IP as an extra cost option to customers of standard Vines servers. This extra charge for TCP/IP on Vines servers continued long after TCP/IP server availability had become commoditized. At the topmost layer, VINES provided the standard file and print services, as well as the unique ''StreetTalk'', likely the first truly practical globally consistent name-service for an entire internetwork. Using a globally distributed, partially replicated database, StreetTalk could meld multiple widely separated networks into a single network that allowed seamless resource-sharing. It accomplished this through its rigidly hierarchical naming-scheme; entries in the directory always had the form ''item''@''group''@''organization''. This applied to user accounts as well as to resources like printers and file servers. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Banyan VINES」の詳細全文を読む スポンサード リンク
|