Hub and router falls to switched internetworking.
It was no surprise to see so many LAN switches on display at the recent Networld+Interop show in Atlanta. Rather, it was further evidence that internetworking is undergoing significant change, driven in part by advances in switching technology, but mostly by evolving business needs.
Until now, the accepted internetworking paradigm has been to utilize hubs and routers to construct enterprise-wide internetworks.
In this scheme, the hubs interconnect the physical links and serve as monitoring and control points for internetwork (1) To go between one network and another.
(2) A large network made up of a number of smaller networks. Same as "internet" (lower case "i"), not the "Internet" (upper case "I"). See internet. management, while the routers are used to segment local area backbones into multiple subnetworks. The routers provide multiprotocol network-to-network connectivity across the enterprise and supply the primary means for enforcing security and access control.
Now, it seems, the hub-router configuration is giving way to a new paradigm New Paradigm
In the investing world, a totally new way of doing things that has a huge effect on business.
The word "paradigm" is defined as a pattern or model, and it has been used in science to refer to a theoretical framework. : switched internetworking.
With the hub-router approach, companies can be constrained in how they organize themselves by the physical structure of their network. Further, as businesses reorganize re·or·gan·ize
v. re·or·gan·ized, re·or·gan·iz·ing, re·or·gan·iz·es
To organize again or anew.
To undergo or effect changes in organization. , moving and adding users means regularly reconfiguring the network, which is time consuming and costly with today's technology.
Switching simplifies the administration of user moves, adds and changes by creating "virtual" LANs, structured logically, with changes done via software.
Switched internetworks also address the changing needs of the workplace, where computers are delivering more power to the desktop, fueling new applications that place increasing demands on the network. Switching eases the traffic bottleneck by providing dedicated rather than shared bandwidth to the desktop.
Switching also provides scalable backbone bandwidth for client/server computing along with support for new bandwidth-intensive and delay-sensitive applications. Despite these benefits, many industry analysts have a caveat: proceed with caution.
For one thing, standards for switched internetworking are incomplete, so network managers risk locking themselves into a single vendor if they deploy the equipment widely. Also, with uncertainties still surrounding interoperability between the switches and asynchronous transfer mode See ATM.
(communications) Asynchronous Transfer Mode - (ATM, or "fast packet") A method for the dynamic allocation of bandwidth using a fixed-size packet (called a cell).
See also ATM Forum, Wideband ATM.
Indiana acronyms. (ATM) backbones, managers could jeopardize their long-term internetworking options.
Another problem is the dearth of network management and diagnostic tools for switched internetworks. Managers have grown used to a high level of network management functionality for their hub-router networks. However, the switched environment raises a new set of network management issues and calls for new network management tools, especially for enterprise-wide coverage.
In particular, large-scale deployments will require RMON (Remote MONitoring) Enhancements to the management information base (MIB) structure used by the simple network management protocol (SNMP). In 1991, RMON added comprehensive network monitoring capabilities. (remote monitoring (protocol) remote monitoring - (RMON) A network management protocol that allows network information to be gathered at a single computer. Whereas SNMP gathers network data from a single type of Management Information Base (MIB), RMON 1 defines nine additional MIBs that provide a ) capability to allow remote network devices to be managed from a central site. Remote monitoring defines a set of statistics and functions that can be exchanged between RMON-compliant management consoles and network probes using the Simple Network Management Protocol (SNMP (Simple Network Management Protocol) A widely used network monitoring and control protocol. Data are passed from SNMP agents, which are hardware and/or software processes reporting activity in each network device (hub, router, bridge, etc. ). It lets network managers track alarms, events and other historical data and keep tabs on such things as network utilization.
Implementing RMON can be expensive, though, because it requires its own dedicated hardware and robs the switch of some of its processing power to handle the data generated. Vendors are addressing the problem by integrating RMON into their switches, either at the silicon level or via software.
Vendors also are embracing RMON2, the next-generation monitoring capability, which provides information on the transport layer of the OSI reference model OSI Reference Model - Open Systems Interconnect to supplement the physical- and data-link level data supplied by RMON.
Recognizing that the shift to switched internetworking will be evolutionary, vendors are also combining the benefits of switching technology with hub-router capabilities.
One example is Bay Networks, which incorporates both functions in its new BaySIS architecture for switched internetworking. The idea behind the architecture is to use switches for what they do best, which is supplying bandwidth, and routers for what they do best-supporting logical connectivity between networks.
"Switching technology promises to revolutionize network computing Storing and/or running applications in servers in a network. See cloud computing and network computer. today in much the same way that LAN (Local Area Network) A communications network that serves users within a confined geographical area. The "clients" are the user's workstations typically running Windows, although Mac and Linux clients are also used. technology changed mainframe and minicomputer-based computing over ten years ago," says Dick Eyestone, vice president of Bay Networks.
Data communications data communications, application of telecommunications technology to the problem of transmitting data, especially to, from, or between computers. In popular usage, it is said that data communications make it possible for one computer to "talk" with another. consultant Morris Edwards is program chairman of the Network Computing Solutions Conference and Expo, or Netcom, to be held Feb. 28-29 in Fort Lauderdale Fort Lauderdale (lô`dərdāl), residential, commercial, and resort city (1990 pop. 149,377), seat of Broward co., SE Fla., on the Atlantic coast; settled around a fort built (c.1837) in the Seminole War, inc. 1911. and March 20-21 in Atlanta.