升级Cisco 806、826、827、828， 831， 836和SOHO70路由器的Cisco IOS软件

Introduction

本文档包含升级您的思科 806、826、827、828、831、836 和 SOHO70 路由器的逐步程序。此程序清除闪存中现有的Cisco IOS软件镜像，并且 从微小的文件传输协议(TFTP) 服务器上用新的Cisco IOS软件镜像替换它。

必须在 TCP/IP 就绪工作站上安装 TFTP 服务器或远程复制协议 (RCP) 服务器应用。安装应用后，必须执行最低级别的配置。首先，TFTP应用程序必须配置成TFTP服务器，而不是用作TFTP客户端。其次，必须指定出站文件目录。这是将在其中存储 Cisco IOS 软件映像的目录。大多数 TFTP 应用会提供一个帮助执行这些配置任务的设置例程。

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

This document is not restricted to specific software and hardware versions.

The information in this document was created from the devices in a specific lab environment.All of the devices used in this document started with a cleared (default) configuration.If your network is live, make sure that you understand the potential impact of any command.

Conventions

有关文档规则的详细信息，请参阅 Cisco 技术提示规则。

升级 Cisco IOS 软件镜像

重要信息：您必须在您的路由器上设置一个有效的 Cisco IOS 软件镜像。确定镜像技术支持您的硬件和软件功能，并且您的路由器有足够的内存来运行镜像。如果您没有Cisco IOS软件镜像，或者如果您不确定镜像是否符合您的所有要求，请参阅如何选择Cisco IOS软件版本。

1. 将 Cisco IOS 软件镜像下载到您的工作站或 PC。

   您可从软件中心下载此镜像（仅限注册用户）。

2. 在 TFTP 服务器的出站目录中安装新的 Cisco IOS 软件镜像。

   TFTP 服务器在此目录中查找路由器的 Cisco IOS 软件镜像。确保您想复制到您的闪存的镜像位于此目录中。

   检查软件镜像升级所需的内存要求，这在 Downloads 下载页面有提及。使用 show version 命令，确认您有足够的内存。

   Router# show version
   Cisco Internetwork Operating System Software
   IOS (tm) C827-4V Software (C827V-Y6-M), Version 12.1(1)XB, EARLY DEPLOYMENT RELE
   ASE SOFTWARE (fc1)
   Copyright (c) 1986-2000 by cisco Systems, Inc.
   Compiled Mon 10-Apr-00 13:45 by phanguye
   Image text-base: 0x80013170, data-base: 0x8067D780
   
   ROM: System Bootstrap, Version 12.1(1r)XB1, RELEASE SOFTWARE (fc1)
   
   Router uptime is 0 minutes
   System returned to ROM by reload
   System image file is "flash:c827v-y6-mz.121-1.XB"
   
   CISCO C827-4V (MPC855T) processor (revision 0x502) with 15360K/1024K bytes of memory.
   Processor board ID JAD043100FS (1979977378), with hardware revision 1987
   CPU rev number 5
   Bridging software.
   4 POTS Ports
   1 Ethernet/IEEE 802.3 interface(s)
   1 ATM network interface(s)
   128K bytes of non-volatile configuration memory.
   8192K bytes of processor board System flash (Read/Write)
   
   Configuration register is 0x2102
   
   

3. 建立一个控制台会话到路由器。

   这可以通过直接控制台连接或虚拟Telnet连接执行。最好使用直接控制台连接，因为在软件安装的重新启动阶段(请参阅步骤9)会丢失Telnet连接。控制台连接使用反转电缆(浅黑或蓝色电缆)进行，并且将路由器的控制台端口连接到PC的COM-port。

   在 PC 上启动 HyperTerminal，并使用以下设置：

   • 9600 bps

   • 8 个数据位

   • 0 个奇偶校验位

   • 1 个停止位

   • 无流控制

   所需的控制台电缆规格如 RJ-45 控制台和 AUX 端口的布线指南（思科 1000 系列、2500 系列和 AS5100）中所述。

4. 验证TFTP服务器到路由器的连通性。

   TFTP 服务器和路由器之间必须有网络连接，且必须能 ping 出 TFTP 软件升级的目标路由器 IP 地址。要实现该操作，路由器接口与TFTP服务器必须具备：

   • 同范围的IP地址，或者

   • 配置了默认网关。

   要验证，请检查TFTP服务器的IP地址。

   Note: 通过验证到TFTP服务器的网络连通性后，在路由器上发出write memory命令，将所有更改写入内存中。

   Router# write memory
   Building configuration...
   [OK]
   Router#
   
   

5. 发出 show flash 命令以检查闪存的可用空间。

   Router# show flash
   System flash directory:
   File  Length   Name/status
     1   3802992  c827v-y6-mz.121-1.XB
   [3803056 bytes used, 4585552 available, 8388608 total]
   8192K bytes of processor board System flash (Read/Write)
   
   

   您应有足够的闪存来安装新的 Cisco IOS 软件镜像。

6. 可选但推荐：将存储在闪存中的现有 Cisco IOS 软件镜像备份。

   Router# copy flash tftp
   Source filename []? c827v-y6-mz.121-1.XB
   Address or name of remote host []? 10.1.1.1
   Destination filename [c827v-y6-mz.121-1.XB]?
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!
   3802992 bytes copied in 27.276 secs (140851 bytes/sec)
   
   

7. 可选但推荐：备份您的配置。

   Router# copy startup-config tftp
   Address or name of remote host []? 10.1.1.1
   Destination filename [startup-config]?
   !!
   676 bytes copied in 0.100 secs

8. 输入 show version 命令以确认配置寄存器设置为 0x2102。此设置是必要配置，以确保路由器从闪存启动。

   如果路由器的配置寄存器没有设置为0x2104，则使用以下命令，进行设置：

   Router# configure terminal 
   Router(config)# config-reg 0x2102 
   Router(config)# exit    
   router#reload
   
   

9. 将 Cisco IOS 软件镜像从 TFTP 服务器复制到路由器中的闪存。

   Router# copy tftp flash
   Address or name of remote host []? 10.1.1.1
   Source filename []? c827v-y6-mz.121-1.XB
   Destination filename [c827v-y6-mz.121-1.XB]?
   %Warning:There is a file already existing with this name
   Do you want to over write? [confirm]
   Accessing tftp://10.1.1.1/c827v-y6-mz.121-1.XB...
   Erase flash: before copying? [confirm]
   Erasing the flash filesystem will remove all files! Continue? [confirm]
   Erasing device... eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
   ee ...erased
   Erase of flash: complete
   Loading c827v-y6-mz.121-1.XB from 10.1.1.1 (via Ethernet0): !!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   !!!
   [OK - 3802992/7605248 bytes]
   
   Verifying checksum...  OK (0x1ABC)
   3802992 bytes copied in 58.236 secs (65568 bytes/sec)
   Router#

10. 通过发出以下命令来确认路由器升级：

    Router>show flash
    

    确定show flash命令输出中的Cisco IOS软件镜像名称是升级镜像的名称。

11. 重新加载路由器，使其从新的 Cisco IOS 软件镜像启动。

    Router#reload
    

12. 通过发出 show version 命令确认路由器从新的 Cisco IOS 软件镜像启动。

    Router#show version
    

    show version 命令的输出应显示升级后的 Cisco IOS 软件镜像的名称。

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