Bridging software.

X.25 software, Version 3.0.0.

Basic Rate ISDN software, Version 1.1.

1 Ethernet/IEEE 802.3 interface(s)

1 Serial(sync/async) network interface(s)

1 ISDN Basic Rate interface(s) System/IO memory with parity disabled

2048K bytes of DRAM onboard 16384K bytes of DRAM on SIMM System running from FLASH

7K bytes of non−volatile configuration memory.

12288K bytes of processor board PCMCIA flash (Read ONLY)

Configuration register is 0x2102

Additional information can be found in Comparison of Cisco 1601−Cisco 1604 and Cisco 1605−R Memory Architectures.

Boot Sequence

Not all Cisco products have the same components or mechanisms for booting. This section describes the boot sequence in the Cisco 1600 Series Router.

The boot ROM which is read−only memory contains two programs:

∙The ROM monitor or ROMmon − The ROMmon is a diagnostic image that provides the user with a limited subset of commands. This diagnostic mode is most often used during recovery procedures (forgotten password or wrong/corrupted Cisco IOS software). It is possible to view or modify the configuration register from this mode and to perform a Cisco IOS software upgrade through the Xmodem transfer.

∙The Bootstrap (RxBoot) − The bootstrap program is written to find and load a copy of Cisco IOS software according to the settings of the configuration register. The Cisco IOS software image can be located either on the system Flash, on a PCMCIA Flash card, or on a Trivail File Transfer Protocol (TFTP) server. Usually, the Cisco IOS software image resides on the PCMCIA Flash card.

When a Cisco 1600 Series Router is first powered up, the bootup sequence involves the following steps:

1.ROMmon (in Boot ROM) takes control of the Main Processor and performs the following:

♦control register settings

♦console settings

♦initial diagnostic tests of memory and other hardware

♦data structure initialization

♦Flash file system (MONLIB) setup.

Based upon the configuration register value in Non−Volatile RAM (NVRAM), the router either stays in ROMmon, or RxBoot is executed from Boot ROM.

2.RxBoot analyzes the hardware. Based upon the configuration register value, the router either stays in RxBoot, or the Cisco IOS software image file (default or as defined in the startup configuration) is executed from PCMCIA Flash or RAM (or moved there from the network). This main Cisco IOS software image re−analyzes the hardware.

The router configuration file, which is stored in NVRAM, can contain boot system commands. For

Cisco 1600 Series Router Architecture

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Cisco Systems 1600 manual Boot Sequence
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1600 specifications

Cisco Systems 1600 series routers are well-regarded in the networking industry for their reliability, versatility, and performance. Designed to meet the needs of small to medium-sized businesses, the Cisco 1600 series is primarily oriented towards providing robust connectivity for branch offices and remote sites.

One of the most significant features of the Cisco 1600 series is its modular architecture. This allows users to customize their routers with various interface cards, enabling support for different types of WAN technologies, including serial, ISDN, and Frame Relay. The modular design not only enhances flexibility but also extends the lifespan of the equipment, as businesses can upgrade their capacity and functionalities according to evolving demands.

Another key characteristic of the Cisco 1600 routers is their advanced routing capabilities. These devices support a wide range of routing protocols, including RIP, OSPF, EIGRP, and BGP. This versatility ensures seamless integration into existing network infrastructures, facilitating the scalability and adaptability that modern networks require.

Security is also a crucial aspect of the Cisco 1600 series. Incorporating features such as access control lists (ACLs) and support for Virtual Private Networks (VPNs), these routers help businesses safeguard their sensitive data during transmission. Enhanced security features allow companies to implement secure remote access for employees, thereby maintaining productivity without compromising safety.

In addition to routing and security, the Cisco 1600 series boasts Quality of Service (QoS) capabilities. This technology enables better management of network traffic, ensuring that critical applications receive the bandwidth they need for optimal performance. By prioritizing important data flows, businesses can enhance user experience and minimize disruptions across their network.

The Cisco 1600 series routers are also equipped with user-friendly interfaces and management tools. Cisco's IOS software platform provides a command-line interface (CLI) and web-based graphical interface for straightforward configuration and monitoring. This simplifies network management tasks and reduces the learning curve for IT personnel.

In summary, the Cisco Systems 1600 series routers offer a significant combination of modularity, robust routing protocols, enhanced security measures, Quality of Service features, and user-friendly management options. These characteristics make them an excellent choice for small to medium-sized enterprises looking to establish a reliable and secure networking infrastructure. With the continued evolution of networking technologies, the Cisco 1600 series stands as a dependable solution for businesses navigating an increasingly complex digital landscape.
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