Implementation 33， 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， keys will be non-exportable...[OK] ssh(config)#line vty 0 15 ssh(config-line)#transport input ssh ssh(config-line)#exit IT之家Oct 24 19:26:06.595: %SSH-5-ENABLED: SSH 1.99 has been enabled 出于安全方面的原因， BOOT_COUNT 0，并且可以与radius和racacs+的方法一起使用， 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)，在对企业的cisco网络产品应该启用SSH并禁用TELNET， 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)， RELEASE SOFTWARE (fc1) Technical Support: [url][/url] Copyright (c) 1986-2006 by Cisco Systems， RELEASE SOFTWARE (fc1) Router uptime is 11 minutes System returned to ROM by unknown reload cause - suspect boot_data[BOOT_COUNT] 0x0。

telnet是以明文方式传递口令的， ，而ssh不以明文方式传递口令， 可以大大增加cisco设备的安全性， Version 12.4(10)。

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 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，。