升級C3550 ISO

　　 1）本機IP 與交換機VLAN 1地址同網段
2）開啟TFTP，瀏覽到IOS文件
3）刪除交換機中的BIN文件及其所在目錄
Cisco3550BK#dir
Directory of flash:/

    2  -rwx           0   Jan 1 1970 00:01:22 +00:00  env_vars
    3  -rwx         344   Jan 1 1970 00:01:22 +00:00  system_env_vars
    4  -rwx         616   Mar 1 1993 06:05:47 +00:00  vlan.dat
    5  -rwx           5   Mar 1 1993 04:51:45 +00:00  private-config.text
    8  drwx          64   Mar 1 1993 00:06:05 +00:00  c3550-i9q3l2-mz.121-20.EA1a
    7  -rwx        4051   Mar 1 1993 04:51:45 +00:00  config.text

Cisco3550BK#cd c3550-i9q3l2-mz.121-20.EA1a
Cisco3550BK#dir
Directory of flash:/c3550-i9q3l2-mz.121-20.EA1a/
    9  drwx        2688   Mar 1 1993 00:03:20 +00:00  html
   91  -rwx     3447390   Mar 1 1993 00:04:24 +00:00  c3550-i9q3l2-mz.121-20.EA1a.bin
   92  -rwx         255   Mar 1 1993 00:04:24 +00:00  info

15998976 bytes total (9356800 bytes free)
Cisco3550BK#delete c3550-i9q3l2-mz.121-20.EA1a.bin
Delete filename [/c3550-i9q3l2-mz.121-20.EA1a/c3550-i9q3l2-mz.121-20.EA1a.bin]?
Delete flash:/c3550-i9q3l2-mz.121-20.EA1a/c3550-i9q3l2-mz.121-20.EA1a.bin? [confirm]
Cisco3550BK#dir
Directory of flash:/c3550-i9q3l2-mz.121-20.EA1a/
    9  drwx        2688   Mar 1 1993 00:03:20 +00:00  html
   92  -rwx         255   Mar 1 1993 00:04:24 +00:00  info

15998976 bytes total (12804608 bytes free)
Cisco3550BK#del html
Delete filename [/c3550-i9q3l2-mz.121-20.EA1a/html]?
Cisco3550BK#delete info
Delete filename [/c3550-i9q3l2-mz.121-20.EA1a/info]?
Delete flash:/c3550-i9q3l2-mz.121-20.EA1a/info? [confirm]

Cisco3550BK#delete /force recursive  c3550-i9q3l2-mz.121-20.EA1a

Cisco3550BK#archive download-sw /overwrite tftp://10.49.0.4/c3550-i5q3l2-tar.122-25.SEA.tar
examining image...
Loading c3550-i5q3l2-tar.122-25.SEA.tar from 10.49.0.4 (via Vlan1): !
extracting info (252 bytes)!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
<omit>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 7748608 bytes]

Image info:
    Version Suffix: i5q3l2-122-25.SEA
    Image Name: c3550-i5q3l2-mz.122-25.SEA.bin
    Version Directory: c3550-i5q3l2-mz.122-25.SEA
    Ios Image Size: 6089728
    Total Image Size: 7746048
    Image Feature: LAYER_3|MIN_DRAM_MEG=64
    Image Family: C3550
Extracting files...
Loading c3550-i5q3l2-tar.122-25.SEA.tar from 10.49.0.4 (via Vlan1): !
extracting info (252 bytes)
c3550-i5q3l2-mz.122-25.SEA/ (directory)
c3550-i5q3l2-mz.122-25.SEA/html/ (directory)
extracting c3550-i5q3l2-mz.122-25.SEA/html/more.txt (62 bytes)
extracting c3550-i5q3l2-mz.122-25.SEA/html/menu.css (1654 bytes)!
extracting c3550-i5q3l2-mz.122-25.SEA/html/back.htm (435 bytes)
extracting c3550-i5q3l2-mz.122-25.SEA/html/images/tab_left_active.gif (852 bytes)
extracting c3550-i5q3l2-mz.122-25.SEA/html/images/122353.gif (3132 bytes)!
extracting c3550-i5q3l2-mz.122-25.SEA/c3550-i5q3l2-mz.122-25.SEA.bin (6087424 bytesextracting c3550-i5q3l2-mz.122-25.SEA/info (252 bytes)!
extracting info.ver (252 bytes)
[OK - 7748608 bytes]

New software image installed in flash:c3550-i5q3l2-mz.122-25.SEA
Configuring system to use new image...done.

Cisco3550BK#verify c3550-i5q3l2-mz.122-25.SEA.bin
Verified c3550-i5q3l2-mz.122-25.SEA.bin

原文轉自：http://www.kjueaiud.com