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This section provides an overview of the products that support protocol translation. You will find the following information in this chapter:
Routers are high-performance application-level gateways that can provide connectivity among systems running differing protocols and over a variety of media.
As part of their software capability, routers provide distributed network management facilities to assist in performance monitoring and run-time error logging, and support the Simple Network Management Protocol (SNMP). These facilities enable you to examine and adjust the routers for optimum performance.
Routers using protocol translation translate virtual terminal protocols, allowing devices running dissimilar protocols to communicate. The protocol translation software supports Telnet (called TCP for Transmission Control Protocol in the configuration syntax of protocol translation software), Local Area Transport (LAT), Serial Line Internet Protocol(SLIP) and Point-to-Point Protocol (PPP), and X.25. One-step protocol translation software performs bidirectional translation between any of the following protocols:
Figure 1-1 illustrates LAT-to-Telnet protocol translation.
Routers provide a flexible set of capabilities for making connections using different media and between different hosts and resources running different protocols. The following descriptions summarize the protocols and connection services supported by routers:
In addition to supporting Ethernet (the 802.3 specification of the Institute of Electrical and Electronic Engineers [IEEE]), routers support synchronous serial circuits at many speeds and can be connected to two serial lines. Router serial interfaces are can of transmit and receive data at up to four megabits per second, and support connectivity to WAN services such as Switched Multimegabit Data Service (SMDS), Frame Relay, and X.25.
A broad line of media adapters are also available for your convenience, including RS-232, V.35, X.21, and RS-449.
This section describes the router models that can be set up to run protocol translation software and the microprocessors these models use.
Internetwork Operating System (IOS) Release 10.3 supports protocol translation on the following router platforms:
Routers also provide nonvolatile memory that retains configuration information despite power losses or system reboots. With nonvolatile memory, the terminal and network servers do not need to rely on other network servers for configuration and boot service information.
Posted: Mon Oct 21 12:35:05 PDT 2002
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