Cisco Systems 1600 manual Private Buffer Pools, Receive Rings and Transmit Rings

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as set forth in subparagraph (c) of the Commercial Computer Software − Restricted Rights clause at FAR sec. 52.227−19 and subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at DFARS sec. 252.227−7013.

cisco Systems, Inc. 170 West Tasman Drive San Jose, California 95134−1706

Cisco Internetwork Operating System Software IOS (tm) 1600 Software (C1600−SY−L), Version 12.1(7), RELEASE SOFTWARE (fc1)

Copyright (c) 1986−2001 by cisco Systems, Inc. Compiled Thu 22−Feb−01 12:56 by kellythw

Image text−base: 0x08041D10, data−base: 0x02005000

cisco 1603 (68360) processor (revision C) with 13824K/4608K bytes of memory. Processor board ID 05317740, with hardware revision 00000000

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)

Building configuration...

[OK]}

Press RETURN to get started!

00:01:05: %SYS−5−CONFIG_I: Configured from memory by console

00:01:58: %SYS−5−RESTART: System restarted −− Cisco Internetwork Operating System Software

IOS (tm) 1600 Software (C1600−SY−L), Version 12.1(7), RELEASE SOFTWARE (fc1) Copyright (c) 1986−2001 by cisco Systems, Inc.

Compiled Thu 22−Feb−01 12:56 by kellythw

Router−1600

Packet Switching

The switching architecture of the Cisco 1600 Series Router is based on the shared memory architecture. The Cisco 2500, 4x00 and AS5300 Series also use this switching architecture.

Cisco IOS software on shared memory routers uses the system buffers for all packet switching, not just process switching. In addition to the standard public buffer pools, the Cisco IOS software also creates private system buffer pools and special buffer structures for the interface controllers called RX rings and TX rings.

Private Buffer Pools

Private buffer pools are static and are allocated with a fixed number of buffers during initialization of the Cisco IOS software. New buffers cannot be created on demand for these pools. If a buffer is needed and none are available in the private pool, Cisco IOS software falls back to the public buffer pool for the size that matches the interface's maximum transmission unit (MTU).

Receive Rings and Transmit Rings

Cisco 1600 Series Router Architecture

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Contents Cisco 1600 Series Router Architecture Table of Contents Introduction Hardware OverviewIntroduction Hardware Overview Block Diagram Router−1600#show memory summary Memory DetailsCisco 1600 Series Router Architecture Boot Sequence Boot system flash slot0c1600−sy−l.122−1a.bin Receive Rings and Transmit Rings Private Buffer Pools− Receiving the packet Switching Paths− Switching the Packet − Transmitting the Packet Related InformationUpdated Oct 10 Document ID
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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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