Analysis of Cisco router IOS backup and recovery

Analysis of Cisco router IOS backup and recovery

Introduction:

I. Wiring

Serial Interface-> console and pc Nic interfaces-> F0/0

// The IP address of the PC and the F0/0 interface (of course, other interfaces can be connected to the network cable). The IP address can be in the same network segment. You can also use an Internet ip address!

Ii. Tools

3 CDaemon (tftp server) and CRT (access routing tool)

Iii. Command Line (Backup)

3640 # copy Flash tftp

Source filename []? C3640-i-mz.120-7.XK1

Address or name of remote host []? 134.106.76.20

Destination filename [c3640-i-mz.120-7.XK1]?

Iii. Command Line (recovery)

3640 # copy tftp Flash

Http://6.cn/watch/8454200.HTML video

Read the following carefully:

IOS Introduction

The software part of the Cisco router is the network operating system. Through IOS, Cisco routers can connect networks of IP addresses, IPX, IBM, DEC, and AppleTalk, and implement many rich network functions.

Introduction to memory

Before introducing the CISCO router IOS upgrade method, it is necessary to briefly introduce the knowledge about the storage of the Cisco router. Similar to a computer, a vro also has memory and an operating system. In a Cisco router, its Operating System is called Internetwork Operating System (IOS. Vro memory mainly includes:

ROM: read-only memory, saving boot diagnostic programs, boot programs and a copy of the IOS in use; software upgrade in ROM requires replacing the chip on the motherboard;

RAM: Random Access Memory for IOS: it is mainly used to store the router configuration in operation and the IOS data structure related to the routing protocol;

Flash (Flash): used to store IOS software image files. Flash memory can erase the memory, which can be overwritten with the new IOS version. IOS upgrades are mainly used to replace IOS image files in Flash memory.

NVRAM: non-volatile random access to memory, used to store system configuration files.

Flash Memory: stores the image and microcode of the operating system. Flash Memory makes it unnecessary to replace the processing chip when the software is upgraded. Flash Memory content can be saved when it is powered off or restarted, flash memory can store multiple versions of IOS software.

TFTP Server Software

The actual network contains multiple routers. These geographically dispersed routers need a place to read and back up system image files. The TFTP server acts as the entire role. Common TFtp server software includes CISCO's cisco tftp and 3COM's 3 Cserver. In this article, we use 3Cserver as the server software. The operation interface is as follows.

Run the 3Cserver software, copy the IOS image file to the relevant directory (such as D: \), and set the Root directory to the directory where the IOS image file is copied (such as D: \). Assume that the IP address of the computer is 172.18.6.75;

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