实验目的：

1、掌握IOS查看、备份、升级、删除。

实验拓扑：

实验步骤：

1、查看R1上IOS镜像，如下：

R1#show flash:


System flash directory:

File  Length   Name/status

  3   5571584  c2600-i-mz.122-28.bin

2、备份IOS。

在PC上架设TFTP服务器，并保证PC与R1直连连通，将R1上IOS镜像备份到TFTP上，如下：

R1#copy flash: tftp:

Source filename []? c2600-i-mz.122-28.bin

Address or name of remote host []? 192.168.1.10

Destination filename [c2600-i-mz.122-28.bin]?

Writing c2600-i-mz.122-28.bin

.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[OK - 5571584 bytes]


5571584 bytes copied in 0.086 secs (64785000 bytes/sec)

当设备IOS损坏或者故障时，通过备份的IOS可以进行恢复。

3、升级IOS。

①若原有IOS不能支持网络需求，则需要对IOS进行升级，一般会将新的IOS放置在TFTP Server上，然后通过TFTP传递到设备上，如下：

R1#copy tftp: flash:

Address or name of remote host []? 192.168.1.10

Source filename []? c2600-advipservicesk9-mz.124-15.T1.bin

Destination filename [c2600-advipservicesk9-mz.124-15.T1.bin]?

Erase flash: before copying? [confirm]n

Verifying checksum...  OK (0xD589)

Accessing tftp://192.168.1.10/c2600-advipservicesk9-mz.124-15.T1.bin...

Loading…c2600-advipservicesk9-mz.124-15.T1.bin…from 192.168.1.10: !!!!!!!!!!!!!!!!!!!!!!!

[OK - 33591768 bytes]

若想保留原有IOS，则不要覆盖；若直接覆盖，只原有IOS被删除。

②查看FLASH,如下：

R1#show flash:

System flash directory:

File  Length   Name/status

  4   33591768 c2600-advipservicesk9-mz.124-15.T1.bin

  3   5571584  c2600-i-mz.122-28.bin

③当有多个IOS时，则需要通过命令指定优先启动的IOS，如下：

R1(config)#boot system flash://c2600-advipservicesk9-mz.124-15.T1.bin

4、删除IOS镜像。

若FLASH大小不够或者无需备份的IOS，则可以删除IOS，如下：

R1#delete flash:c2600-i-mz.122-28.bin

Delete filename [c2600-i-mz.122-28.bin]?

Delete flash:c2600-i-mz.122-28.bin? [confirm]

或者直接格式化flash，如下：

R1#erase flash:

Erasing the flash filesystem will remove all files! Continue? [confirm]

Erasing device... eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ...erased

Erase of flash: complete

当然，格式化命令比较危险，慎用！

此实验完成。