使用ssh协议访问cisco设备

    SSH 协议要在12.1（11）以上的IOS 版本才被cisco 设备支持的。查看IOS版本
   
    Router#show version
    Cisco IOS Software, 3600 Software (C3640-JS-M), Version 12.4(10), RELEASE SOFTWARE (fc1)
    Technical Support: http://www.cisco.com/techsupport
    Copyright (c) 1986-2006 by Cisco Systems, Inc.
    Compiled Wed 16-Aug-06 04:04 by prod_rel_team
    ROM: ROMMON Emulation Microcode
    ROM: 3600 Software (C3640-JS-M), Version 12.4(10), RELEASE SOFTWARE (fc1)
    Router uptime is 11 minutes
    System returned to ROM by unknown reload cause - suspect boot_data[BOOT_COUNT] 0x0,

    BOOT_COUNT 0, BOOTDATA 19
    System restarted at 19:05:39 UTC Wed Oct 24 2007
    System image file is "tftp://255.255.255.255/unknown"
    Cisco 3640 (R4700) processor (revision 0xFF) with 124928K/6144K bytes of memory.
    Processor board ID 00000000
    R4700 CPU at 100MHz, Implementation 33, Rev 1.2
    1 FastEthernet interface
    4 Serial interfaces
    DRAM configuration is 64 bits wide with parity enabled.
    125K bytes of NVRAM.
    8192K bytes of processor board System flash (Read/Write)

    Configuration register is 0x2102
   
    下面开始正式配置SSH
   
    ssh(config)#hostname ssh
    ssh(config)#ip domain-name eric.com
    ssh(config)#aaa new-model
    ssh(config)#username eric86 password eric86
    ssh(config)#crypto key generate rsa modulus 2048
    The name for the keys will be: ssh.eric.com
    % The key modulus size is 2048 bits
    % Generating 2048 bit RSA keys, keys will be non-exportable...[OK]
    ssh(config)#line vty 0 15
    ssh(config-line)#transport input ssh
    ssh(config-line)#exit
    *Oct 24 19:26:06.595: %SSH-5-ENABLED: SSH 1.99 has been enabled

    出于安全方面的原因,在对企业的cisco网络产品应该启用SSH并禁用TELNET.因为telnet是以明文方式传递口令的,而ssh不以明文方式传递口令,并且可以与radius和racacs+的方法一起使用.这样一来就可以大大的增加cisco设备的安全性.问题虽简单,但细节决定一切.

【责编:Zenghui】