文档介绍:思科网院CCNA讲课第二学期第一课
SwitchB
RouterA
RouterB
SwitchA
S0
Idle Location
* 0 con 0 3
2
11 vty 0 idle 1
查看Telnet连接
RouterA#disconnect
Closing connection to [confirm]
RouterA#clear line 11
[confirm]
[OK]
关闭一个被远程设备打开的会话
关闭一个远程连接
SwitchB
RouterA
RouterB
SwitchA
S0
S1
关闭Telnet会话
检验与远程设备的连通性
ping
Router##ping
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to , timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
简单ping
扩展ping
扩展PING是交互式的
提供了规定测试数据包的数量和大小、超时时间和数据形式的功能,以作为不同提示的响应。
使用方法:
Router#ping <CR>,然后根据提示输入所需的参数。
Router#trace
Type escape sequence to abort.
Tracing the route to
1 4 msec 4 msec 4 msec
Router#
trace
管理IOS
RAM
Config register
ROM
Flash
NVRAM
Interfaces
路由器内部组件
ROM
包含基本功能里的代码值
Bootstrap
Mini IOS
ROMmonitor
POST
show version
Console
ROM的功能
Flash
show
version
show
startup-config
IOS
搜索顺序:
1. 检查配置寄存器的值
2. 解析 NVRAM里的配置文件
3. 找寻默认的 Flash里的文件
4. 试图进行网络查询
5. RXBOOT(mini IOS文件)
6. ROMMON(rommon状态)
Console
Config register
NVRAM
发现IOS
wg_ro_a#show version
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-JS-L), Version (3), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Mon 08-Feb-99 18:18 by phanguye
Image text-base: 0x03050C84, data-base: 0x00001000
ROM: System Bootstrap, Version (10c), SOFTWARE
BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version (10c), RELEASE SOFTWARE (fc1)
wg_ro_a uptime is 20 minutes
System restarted by reload
System image file is "flash:c2500-js-l_120-"
--More--
Configurat