注：升级前对设备IOS及配置文件需要进行备份。

4506A#show version

Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500-IPBASE-M), Version 12.2(50)SG3, RELEASE 

cisco WS-C4506 (MPC8245) processor (revision 4) with 524288K bytes of memory.

Processor board ID FOX081302Z5

MPC8245 CPU at 400Mhz, Supervisor V

Last reset from PowerUp

1 Virtual Ethernet interface

68 Gigabit Ethernet interfaces

511K bytes of non-volatile configuration memory.

引擎：WS-X4516 （现引擎都是SUP8+UniversalIOS，但不排除会遇到比较老的设备）

1、插入CF卡有如下提示

   *Apr  8 23:37:37.775: %FILESYS-5-CFLASH: Compact flash card inserted into slot0

2、 Switch#dir slot0:

    Directory of slot0:/

    2  -rw-        8369   Apr 9 2015 06:35:55 +00:00  4506-oa-server_config

    3  -rwx    18086076   Apr 9 2015 06:37:15 +00:00  cat4500-entservices-mz.122-54.SG1.bin

3、 copy slot0:cat4500-entservices-mz.122-54.SG1.bin bootflash:

4、 boot system flash bootflash:/cat4500-entservices-mz.122-54.SG1.bin

5、 copy slot0:4506-oa-server_config running-config

    wr mem 

6、 reload