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图解Cisco Packet Tracert之利用TFTP来升级路由器的IOS

日期：2017-11-11点击：570收藏

对于我们这些学生来说，如果是自学的朋友来说，想摸到真机那实在是太难了，说去买一台呢？买来又没有多大作用，利用dynamips来模拟呢，他本来就是加载的IOS，在flash里面又没有IOS，这时候那对于我们自学的朋友怎么办呢？大家可以使用Cisco Packet Tracert来做这个实验，那么下面我就带领着大家一起来把这个实验做做。

拓扑图如下：

现在我们将路由器端配置好:

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#

在路由器上面暂时就只需要配置一个IP地址就行了。

在TFTP Server端的配置如下：

这里将TFTP Server端的IP地址配置在与路由器同一个网段中。

开启TFTP Service功能。在这里我们可以看见有很多种的ios文件。

现在测试一下我们的TFTP Server与路由器是否能够正常通信。

从上面结果来看我们的TFTP Server能够正常下我们的路同器进行通信。

好了现在我们开始来升级我们的IOS：

Router>en
Router#dir 先查看一下我们当前flash里面的IOS文件，这里我们可以看出来我们当前的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)      这里我们可以看出当前总共用了多少空间，总共有
Router#copy tftp: flash: 这句就是将TFTP里面的IOS复制到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]?     传到路由器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]    这里！表示正在传送。

15522644 bytes copied in 8.516 secs (309739 bytes/sec) 这里是我们IOS总共有多大，从这里我们可以看出来，我们的IOS大于了我们的FLASH空间，所以会提示空间不足。
%Error copying tftp://192.168.1.2/c2800nm-ipbasek9-mz.124-8.bin (Not enough space on device) 这里提示我们出错了，原因是空间不足，所以我们在传IOS的时候我们还是要先看看FLASH时面当前剩余的空间有多大。

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#

当我们上传成功以后呢？这里面就应该显示我们刚才所上传的那个IOS文件名了。

那么我们再来看看，如何将路由器里面的IOS下载到我们的TFTP Server上面去呢？

Router#copy flash: tftp: 这条命令就是将flash里面的IOS复制到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#

以上就是我们将ios升级到路由器上，将路由器上的IOS备份到PC上。要做上在的那个实验可以用下面的方法来实现。

Router#delete flash: 删除flash里面的文件
Delete filename []?c2800nm-advipservicesk9-mz.124-15.T1.bin 删除IOS文件
Delete flash:/c2800nm-advipservicesk9-mz.124-15.T1.bin? [confirm] 提示我们是否真的要删除，如果是按回车

Router#dir 我们现在查看一下flash里面到低还有没有我们的IOS文件了呢？没有了吧！
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:   将TFTP服务器上面的IOS升级到路由器上面
Address or name of remote host []? 192.168.1.2   TFTP服务器的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]?   传到路由器上面的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 上传成功以后我们再来查看一下看看我们的IOS上传成功没有。
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#

看看我们的C2800nm-ipbasek9-mz.124-8.bin是不是上传成功了呢？

好了到此我们的这个通过TFTP 来升级与备份IOS是不是就成功了。还是很简单吧

本文转自 ltyluck 51CTO博客，原文链接:http://blog.51cto.com/ltyluck/209278

！

原文链接：https://yq.aliyun.com/articles/479142

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