Router>en?
Router#conf t?
Enter configuration commands, one per line.? End with CNTL/Z.?
Router(config)#int fa0/0?
Router(config-if)#ip add 192.168.1.1 255.255.255.0?
Router(config-if)#no shut

%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up?
Router(config-if)#?
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to upend?
Router#

Router>en?
Router#dir?? 先查看一下我們當前flash里面的IOS文件，這里我們可以看出來我們當前的IOS文件是?
Directory of flash:/

??? 3? -rw-??? 50938004????????? <no date>?c2800nm-advipservicesk9-mz.124-15.T1.bin?
??? 2? -rw-?????? 28282????????? <no date>? sigdef-category.xml?
??? 1? -rw-????? 227537????????? <no date>? sigdef-default.xml

64016384 bytes total (12822561 bytes free)????? 這里我們可以看出當前總共用了多少空間，總共有?
Router#copy tftp: flash:? 這句就是將TFTP里面的IOS復制到FLASH里面。?
Address or name of remote host []??192.168.1.2??? TFTP Server端的IP地址?
Source filename []??c2800nm-ipbasek9-mz.124-8.bin??? TFTP Server上面的IOS文件名?
Destination filename [c2800nm-ipbasek9-mz.124-8.bin]????? 傳到路由器FLASH里面的IOS文件名?
Accessing tftp://192.168.1.2/c2800nm-ipbasek9-mz.124-8.bin...?
Loading c2800nm-ipbasek9-mz.124-8.bin from 192.168.1.2: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!?
[OK - 15522644 bytes]??? 這里！表示正在傳送。

15522644 bytes copied in 8.516 secs (309739 bytes/sec)?? 這里是我們IOS總共有多大，從這里我們可以看出來，我們的IOS大于了我們的FLASH空間，所以會提示空間不足。?
%Error copying tftp://192.168.1.2/c2800nm-ipbasek9-mz.124-8.bin (Not enough space on device) 這里提示我們出錯了，原因是空間不足，所以我們在傳IOS的時候我們還是要先看看FLASH時面當前剩余的空間有多大。

Router#dir?
Directory of flash:/

??? 3? -rw-??? 50938004????????? <no date>? c2800nm-advipservicesk9-mz.124-15.T1.bin?
??? 2? -rw-?????? 28282????????? <no date>? sigdef-category.xml?
??? 1? -rw-????? 227537????????? <no date>? sigdef-default.xml

64016384 bytes total (12822561 bytes free)?
Router#

當我們上傳成功以后呢？這里面就應該顯示我們剛才所上傳的那個IOS文件名了。

那么我們再來看看，如何將路由器里面的IOS下載到我們的TFTP Server上面去呢？

Router#copy flash: tftp:? 這條命令就是將flash里面的IOS復制到tftp上面去?
Source filename []??c2800nm-advipservicesk9-mz.124-15.T1.bin??? flash上面的IOS文件名?
Address or name of remote host []??192.168.1.2???? TFTP Server的IP地址?
Destination filename [c2800nm-advipservicesk9-mz.124-15.T1.bin]???? 保存在TFTP Server端的文件名?
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 50938004 bytes]

50938004 bytes copied in 28.046 secs (1816000 bytes/sec)?
Router#

以上就是我們將ios升級到路由器上，將路由器上的IOS備份到PC上。要做上在的那個實驗可以用下面的方法來實現。

Router#delete flash:??? 刪除flash里面的文件?
Delete filename []?c2800nm-advipservicesk9-mz.124-15.T1.bin 刪除IOS文件?
Delete flash:/c2800nm-advipservicesk9-mz.124-15.T1.bin? [confirm]???提示我們是否真的要刪除，如果是按回車

Router#dir?? 我們現在查看一下flash里面到低還有沒有我們的IOS文件了呢？沒有了吧！?
Directory of flash:/

??? 2? -rw-?????? 28282????????? <no date>? sigdef-category.xml?
??? 1? -rw-????? 227537????????? <no date>? sigdef-default.xml

64016384 bytes total (63760565 bytes free)?
Router#copy tftp: flash:?? 將TFTP服務器上面的IOS升級到路由器上面?
Address or name of remote host []??192.168.1.2?? TFTP服務器的IP地址?
Source filename []??c2800nm-ipbasek9-mz.124-8.bin?? TFTP上面的IOS文件名?
Destination filename [c2800nm-ipbasek9-mz.124-8.bin]??? 傳到路由器上面的IOS文件名?
Accessing tftp://192.168.1.2/c2800nm-ipbasek9-mz.124-8.bin...?
Loading c2800nm-ipbasek9-mz.124-8.bin from 192.168.1.2: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!?
[OK - 15522644 bytes]

15522644 bytes copied in 8.906 secs (296175 bytes/sec)?
Router#dir?? 上傳成功以后我們再來查看一下看看我們的IOS上傳成功沒有。?
Directory of flash:/

??? 4? -rw-??? 15522644????????? <no date>??c2800nm-ipbasek9-mz.124-8.bin?
??? 2? -rw-?????? 28282????????? <no date>? sigdef-category.xml?
??? 1? -rw-????? 227537????????? <no date>? sigdef-default.xml

64016384 bytes total (48237921 bytes free)?
Router#

看看我們的C2800nm-ipbasek9-mz.124-8.bin是不是上傳成功了呢？