要对交换机进行IOS版本升级，首先要确认的是内存及flash空间大小是否满足基本要求。
如：欲将当前3750交换机升级至c3750-ipbasek9-mz.122-50.SE4.bin 
要求：Minimum Memory: DRAM:128 MB  Flash:16 MB 
 
  • 查看memory大小：
Cisco3750-C#sh ver
Cisco IOS Software, C3750 Software (C3750-IPBASE-M), Version 12.2(35)SE5, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Thu 19-Jul-07 19:15 by nachen
Image text-base: 0x00003000, data-base: 0x01080000
ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(25r)SEE4, RELEASE SOFTWARE (fc1)
Cisco3750-C uptime is 2 years, 24 weeks, 1 day, 22 hours, 39 minutes
System returned to ROM by power-on
System restarted at 16:47:32 utc Thu Dec 6 2007
System p_w_picpath file is "flash:c3750-ipbase-mz.122-35.SE5/c3750-ipbase-mz.122-35.SE5.bin"
cisco WS-C3750G-48TS (PowerPC405) processor (revision F0) with 118784K/12280K bytes of memory.
Processor board ID FOC1138Z15E
Last reset from power-on
2 Virtual Ethernet interfaces
52 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.
512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address       : 00:1E:49:A0:16:00
Motherboard assembly number     : 73-10218-08
Power supply part number        : 341-0107-01
Motherboard serial number       : FOC11451F0Z
Power supply serial number      : AZS11422278
Model revision number           : F0
Motherboard revision number     : C0
Model number                    : WS-C3750G-48TS-S
System serial number            : FOC1138Z15E
Top Assembly Part Number        : 800-26857-02
Top Assembly Revision Number    : A0
Version ID                      : V04
CLEI Code Number                : COM7X10ARA
Hardware Board Revision Number  : 0x09

Switch   Ports  Model              SW Version              SW Image           
------   -----  -----              ----------              ----------         
*    1   52     WS-C3750G-48TS     12.2(35)SE5             C3750-IPBASE-M     

Configuration register is 0xF
 
  • 查看flash大小
Cisco3750-C#dir /all
Directory of flash:/
    2  -rwx           5  May 18 2010 16:41:21 +08:00  private-config.text
    4  -rwx        1156   Jan 9 2009 19:04:04 +08:00  vlan.dat
    5  -rwx        6448  May 18 2010 16:41:21 +08:00  config.text
    6  drwx         192   Mar 1 1993 08:09:34 +08:00  c3750-ipbase-mz.122-35.SE5
32514048 bytes total (22877696 bytes free)
 
综上，内存为128M，flash空间大小为32M。