網(wǎng)絡技能tips
1.清除路由器口令:
有時候,我們常常會忘記路由器的密碼,為了找回密碼,正常進入設備進行配置,需要修改路由器中存儲器的值,那么什么是存儲器呢?
路由器與計算機有相似點是,它也有內存、操作系統(tǒng)、配置和用戶界面,Cisco路由器中,操作系統(tǒng)叫做
互連網(wǎng)操作系統(tǒng)(Internetwork Operating System)或IOS。路由器中的存儲部件:
ROM:只讀存儲器包含路由器正在使用的IOS的一份副本;
RAM:IOS將隨機訪問存儲器分成共享和主存。主要用來存儲運行中的路由器配置和與路由協(xié)議有關的IOS數(shù)據(jù)結構;
閃存(FLASH):用來存儲IOS軟件映像文件,閃存是可以擦除內存,它能夠用IOS的新版本覆寫,IOS升級主要是閃存中的IOS映像文件進行更換。
NVRAM:非易失性隨機訪問存儲器,用來存儲系統(tǒng)的配置文件。
下表是常用類型路由器的內存功能。
表:路由器內存詳細信息一覽表
內存類型
?2500、2600、3600
?4000、7000
?
ROM
?不能升級的基本IOS
?可升級IOS
?
共享RAM
?存儲緩沖區(qū)
?存儲緩沖區(qū)
?
主RAM
?只有路有表和IOS數(shù)據(jù)結構
?從閃存裝入IOS, 路有表和IOS數(shù)據(jù)結構
?
閃存(FLASH)
?包含IOS(路由器從閃存運行IOS)
?包含IOS
?
NVRAM
?配置文件
?配置文件
?
注:因為2500、2600、3600系列從閃存中運行IOS,所以,在路由器運行期間,2500、2600、3600可能沒有足夠的內存升級IOS。在4000、7000系列中,IOS在主RAM中運行,因此,在路由器運行期間,閃存能夠升級。
為了進入路由器,需要先修改存儲器的值:
開機后,連續(xù)按Ctrl+Break進入RMON模式,輸入命令:
o/r 0x2142
i
正常進入系統(tǒng)后,輸入命令wr保存配置,然后輸入命令
Router# conf t
Router(conf)# config-register 0x2102
Router# reload
Router#yes
即可
2.升級2600路由器
IP_ADDRESS=192.168.1.10
IP_SUBNET_MASK=255.255.255.0
DEFAULT_GATEWAY=192.168.1.1
TFTP_SERVER=192.168.1.7
TFTP_FILE=c2600-telco-mz.122-15.T17.bin
tftpdnld
3. 合并FLASH
erase flash:2
conf t
part flash 1
config 0x101
exit
write memory
sh flas
4. CISCO2600路由器配置信息無法保存,怎樣辦?這樣辦:
System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
Copyright (c) 1999 by cisco Systems, Inc.
TAC:Home:SW:IOS:Specials for info
C2600 platform with 24576 Kbytes of main memory
program load complete, entry point: 0x80008000, size: 0x371d9c
PC = 0xfff0a530, Vector = 0x500, SP = 0x817ffeb0
--------------按Ctrl+Break------------
monitor: command "boot" aborted due to user interrupt
rommon 1 > confreg
Configuration Summary
enabled are:
use all zero broadcast
break/abort has effect
ignore system config info
console baud: 9600
boot: image specified by the boot system commands
or default t cisco2-C2600
do you wish to change the configuration? y/n [n]: y --------輸入y
enable "diagnostic mode"? y/n [n]: --------回車
enable "use net in IP bcast address"? y/n [n]: ---------回車
enable "load rom after netboot fails"? y/n [n]: ---------回車
disable "use all zero broadcast"? y/n [n]: ---------回車
disable "break/abort has effect"? y/n [n]: ---------回車
disable "ignore system config info"? y/n [n]: y ---------輸入y,然后回車
change console baud rate? y/n [n]: ---------回車
change the boot characteristics? y/n [n]: ---------回車
Configuration Summary
enabled are:
use all zero broadcast
break/abort has effect
console baud: 9600
boot: image specified by the boot system commands
or default t cisco2-C2600
do you wish to change the configuration? y/n [n]: ---------回車
You must reset or power cycle for new config to take effect
rommon 2 > reset ---------輸入reset,然后回車
System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
Copyright (c) 1999 by cisco Systems, Inc.
TAC:Home:SW:IOS:Specials for info
C2600 platform with 24576 Kbytes of main memory
program load complete, entry point: 0x80008000, size: 0x371d9c
Self decompressing the image : #################################################
.....系統(tǒng)恢復正常.....
5.共享一個CISCO未公開的命令 “if-con”
--------------------------------------------------------------------------------
On Cisco 7500 you can connect you to the VIP boards for VIP commands (memory, cpu, etc.)
Router#if-con 2 con
Entering CONSOLE for VIP2 2
Type "^C^C^C" or "if-quit" to end this session
VIP-Slot2>
VIP-Slot2>?
Exec commands:
clear Reset functions
disable Turn off privileged commands
disconnect Disconnect an existing network connection
enable Turn on privileged commands
exit Exit from the EXEC
help Description of the interactive help system
lock Lock the terminal
login Log in as a particular user
logout Exit from the EXEC
name-connection Name an existing network connection
ping Send echo messages
resume Resume an active network connection
set Set system parameter (not config)
show Show running system information
systat Display information about terminal lines
terminal Set terminal line parameters
traceroute Trace route to destination
where List active connections
VIP-Slot2>en
VIP-Slot2#sh ver
Cisco Internetwork Operating System Software
IOS (tm) VIP Software (SVIP-DW-M), Version 12.0(7), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Wed 13-Oct-99 22:05 by phanguye
Image text-base: 0x60010920, data-base: 0x60224000
ROM: System Bootstrap, Version 11.1(11368) [pgreenfi 17], INTERIM SOFTWARE
VIP-Slot2 uptime is 10 minutes
System restarted by power-on
Running default software
cisco VIP2 (R4700) processor (revision 0x02) with 8192K bytes of memory.
Processor board ID 00000000
R4700 processor, Implementation 33, Revision 1.0 (512KB Level 2 Cache)
4 Ethernet/IEEE 802.3 interface(s)
1 FastEthernet/IEEE 802.3 interface(s)
Configuration register is 0x0
VIP-Slot2#?
Exec commands:
cd Change current directory
clear Reset functions
clock Manage the system clock
configure Enter configuration mode
copy Copy from one file to another
debug Debugging functions (see also 'undebug')
delete Delete a file
dir List files on a filesystem
disable Turn off privileged commands
disconnect Disconnect an existing network connection
enable Turn on privileged commands
exit Exit from the EXEC
help Description of the interactive help system
lock Lock the terminal
login Log in as a particular user
logout Exit from the EXEC
more Display the contents of a file
name-connection Name an existing network connection
no Disable debugging functions
ping Send echo messages
pwd Display current working directory
reload Halt and perform a cold restart
resume Resume an active network connection
send Send a message to other tty lines
set Set system parameter (not config)
setup Run the SETUP command facility
show Show running system information
systat Display information about terminal lines
terminal Set terminal line parameters
test Test subsystems, memory, and interfaces
traceroute Trace route to destination
undebug Disable debugging functions (see also 'debug')
where List active connections
write Write running configuration to memory, network, or terminal
VIP-Slot2#
======= 2005-05-08 13:36:00 您在來信中寫道:=======
>networker,您好!
>
> You can identify your VIP2 model using the show diag command and observing either of the following output:
>
> 1.SRAM and DRAM memory
> 2.EEPROM value
>
>Identifying the VIP2 Model Using show diag command and SRAM and DRAM Memory Output
>Observe the memory configurations in the "Controller Memory Size" row to determine your VIP2 model, as follows:
>
>
>Table 4 VIP2 Memory Configurations
>
>VIP SRAM Memory DRAM Memory
>VIP2-10 512 KB SRAM 8 MB DRAM
>
>VIP2-15 1 MB SRAM 8 MB DRAM
>
>VIP2-20 1 MB SRAM 16 MB DRAM
>
>VIP2-40 2 MB SRAM 32 MB or 64 MB DRAM
>
>
>
>
>--------------------------------------------------------------------------------
> Note The VIP2-50 is a different motherboard, and in the show diag output you will see "VIP2 R5K controller".
>
>--------------------------------------------------------------------------------
>
>In the following example, observing the "Controller Memory Size" row of the show diag output shows a VIP2-40 installed.
>
>doc-7507#show diag
>Slot 0:
>Physical slot 0, ~physical slot 0xF, logical slot 0, CBus 0
>Microcode Status 0x4
>Master Enable, LED, WCS Loaded
>Board is analyzed
>Pending I/O Status: None
>EEPROM format version 1
>VIP2 controller, HW rev 2.13, board revision A0
>Serial number: 19430823 Part number: 73-1684-05
>Test history: 0x00 RMA number: 00-00-00
>Flags: cisco 7000 board; 7500 compatible
>EEPROM contents (hex):
>0x20: 01 15 02 0D 01 28 7D A7 49 06 94 05 00 00 00 00
>0x30: 50 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00
>Slot database information:
>Flags: 0x4 Insertion time: 0x2064 (8w5d ago)
>Controller Memory Size: 32 MBytes DRAM, 2048 KBytes SRAM
>PA Bay 0 Information:
>Fast-Ethernet PA, 1 ports, 100BaseTX-ISL
>EEPROM format version 1
>HW rev 1.04, Board revision B0
>Serial number: 16749501 Part number: 73-1688-05
>--Boot log begin--
>Cisco Internetwork Operating System Software
>IOS (tm) VIP Software (SVIP-DW-M), Version 12.1(6)E, EARLY DEPLOYMENT RELEASE S)
>TAC Support: http://www.cisco.com/cgi-bin/ibld/view.pl?i=support
>Copyright (c) 1986-2001 by cisco Systems, Inc.
>Compiled Fri 16-Mar-01 22:16 by eaarmas
>Image text-base: 0x60010940, data-base: 0x60380000
>--Boot log end--
>Identifying the VIP2 Model Using show diag command and EEPROM Value Output
>Another method to determine your VIP model is to check the contents of the address in EEPROM in the show diag output. The values corresponding to each VIP type are shown in the table below:
>
>
>Table 5 Distinguishing VIP2 Models Based on Show Diag Output
>
>VIP2 EEPROM Value
>VIP2-10, VIP2-15, VIP2-20, VIP2-40 0x15
>
>VIP2-50 0x1E
>
>
>
>Observing the "EEPROM contents (hex)" contents of the show diag output, the following example shows a VIP2-50 installed:
>
>Router#show diag 10
>Slot 10:
>Physical slot 10, ~physical slot 0x5, logical slot 10, CBus 0
>Microcode Status 0x4
>Master Enable, LED, WCS Loaded
>Board is analyzed
>Pending I/O Status: None
>EEPROM format version 1
>VIP2 R5K controller, HW rev 2.02, board revision D0
>Serial number: 17090200 Part number: 73-2167-05
>Test history: 0x00 RMA number: 00-00-00
>Flags: cisco 7000 board; 7500 compatible
>EEPROM contents (hex):
>0x20: 01 1E 02 02 01 04 C6 98 49 08 77 05 00 00 00 00
>0x30: 68 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00
>Slot database information:
>Flags: 0x4 Insertion time: 0x18C0 (00:29:13 ago)
>Controller Memory Size: 32 MBytes DRAM, 4096 KBytes SRAM
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