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Boot System Commands    Configure router to boot another IOS    All routers can boot from TFTP Server    router(config)#bo...
Backing Up and RestoringCisco IOS    Make sure you access network server    Ensure that the network server has adequate sp...
Verify Flash Memory andBack IOS    Router#show flash    Router#show version    Router#ping <tftp­server­ip>    Router#copy...
Restore / Upgrade IOS    Router#copy tftp flash                              
Cisco File System    Router#pwd    Router#dir    Router#delete flash:<filename>    Router#sh flash    Router#copy tftp://<...
Backup Configuration    Verify Stored Configuration      Router#show startup­config    Verify Current Configuration      R...
Copy running-config to TFTP    Router#copy running­config tftp                              
Restoring running-config    Router#copy tftp running­config                              
Erasing the Configuration    Router#erasse startup­config    Router#reload      Remember: When you are prompted witht he m...
Cisco File System    Router#show file informationnvram:running­config    R#cd nvram    R#pwd    R#cd system:    R#dir    R...
Cisco CDP    Cisco Discovery Protocol    Show CDP Gives information      CDP Timer: how often CDP packets are transmitted ...
Gathering Neighbor Info    R#sho cdp neighbors    R#sho cdp neighbors detail    R#sh cdp nei de    R#sh cdp entry *      S...
Gathering Interface Traffic    R#sh cdp traffic      Shows how many CDP packets have been sent and         received       ...
Gathering Port andInterface Information    R#sh cdp interface      Gives status on router interfaces or switch ports    To...
Telnet    Posted Online    http://blog.helghareeb.net/2012/01/03/telnet­lab/     R#sh sessions      See sessions from your...
Resolving Hostname    Use hostname rather IP address to connect to Remote      Device    Translate hostname to IP    Two w...
Build Host Table    Ip host <host­name> [tcp­port#] <ip­address>    Default Telnet Port is 23    R(config)#ip host R1 <ip>...
Using DNS to ResolveNames    Use DNS Server to resolve names: because we have      lots of Names    Any time a Cisco devic...
Having DNS    Add Commands:      R(config)#ip domain­lookup      R(config)#ip name­server      R(config)#ip domain­name   ...
Network Connectivity andTroubleshooting    R#ping <>    R#traceroute <>                       
Debugging    R#debug all    R#no debug all    R#debug ip rip    R#show processes                        
Further Readings    How to Become Network Administrator?      Part 1:         http://www.catazinelive.catreloaded.net/2012...
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Cisco ios-cont

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Transcript of "Cisco ios-cont"

  1. 1. Boot System Commands Configure router to boot another IOS All routers can boot from TFTP Server router(config)#boot ? router(config)#boot system ? router(config)#boot system flash <iosname>.bin router(config)#boot system tftp <iosname>bin <ip> router(config)#boot system rom router(config)#do show run | include boot system   
  2. 2. Backing Up and RestoringCisco IOS Make sure you access network server Ensure that the network server has adequate space for  the code image Verify the file naming and path requirements Besides: TFTP Server software is running Ethernet connection  between workstation and router is  crossover Workstation and Router interface are on the same subnet   
  3. 3. Verify Flash Memory andBack IOS Router#show flash Router#show version Router#ping <tftp­server­ip> Router#copy flash tftp Walk through questions!   
  4. 4. Restore / Upgrade IOS Router#copy tftp flash   
  5. 5. Cisco File System Router#pwd Router#dir Router#delete flash:<filename> Router#sh flash Router#copy tftp://<ip>//file name/ flash:/ Router#show file information flash:<filename>   
  6. 6. Backup Configuration Verify Stored Configuration Router#show startup­config Verify Current Configuration Router#show running­config Coppying Current Configuration Copy running­config startup­config And vice versa!   
  7. 7. Copy running-config to TFTP Router#copy running­config tftp   
  8. 8. Restoring running-config Router#copy tftp running­config   
  9. 9. Erasing the Configuration Router#erasse startup­config Router#reload Remember: When you are prompted witht he message,  answer: n What happens if you answer yes?   
  10. 10. Cisco File System Router#show file informationnvram:running­config R#cd nvram R#pwd R#cd system: R#dir R#config net R#copy tftp://<ip>/<file> system://running­config   
  11. 11. Cisco CDP Cisco Discovery Protocol Show CDP Gives information CDP Timer: how often CDP packets are transmitted CDP holdtime: amount of time that device will hold  packets received from neighbor devices R#show cdp R(config)#cdp ?   
  12. 12. Gathering Neighbor Info R#sho cdp neighbors R#sho cdp neighbors detail R#sh cdp nei de R#sh cdp entry * Same as the previous... but? R#show cdp entry * ? Protocols Version   
  13. 13. Gathering Interface Traffic R#sh cdp traffic Shows how many CDP packets have been sent and  received   
  14. 14. Gathering Port andInterface Information R#sh cdp interface Gives status on router interfaces or switch ports To turn off cdp on router: R(config)#no cdp run Enable CDP R(confi)#cdp enable   
  15. 15. Telnet Posted Online http://blog.helghareeb.net/2012/01/03/telnet­lab/  R#sh sessions See sessions from your router to a remote device R#sh users List all active consoles and VTY pots on my router Exit: Close telnet session R#disconnect ?  Close connection to router  
  16. 16. Resolving Hostname Use hostname rather IP address to connect to Remote  Device Translate hostname to IP Two ways: Build host table on each router Build DNS Server (dynamic host table)   
  17. 17. Build Host Table Ip host <host­name> [tcp­port#] <ip­address> Default Telnet Port is 23 R(config)#ip host R1 <ip> R(config)#do show hosts R#R1 Trying to connect to my telnet... WoW!   
  18. 18. Using DNS to ResolveNames Use DNS Server to resolve names: because we have  lots of Names Any time a Cisco device receives a command it  doesnt understand, it will try to resolve it through  DNS by default. R(config)#no ip domain­lookup What happens here?   
  19. 19. Having DNS Add Commands: R(config)#ip domain­lookup R(config)#ip name­server R(config)#ip domain­name   
  20. 20. Network Connectivity andTroubleshooting R#ping <> R#traceroute <>   
  21. 21. Debugging R#debug all R#no debug all R#debug ip rip R#show processes   
  22. 22. Further Readings How to Become Network Administrator? Part 1:  http://www.catazinelive.catreloaded.net/2012/02/01/how­to­b Part 2:  http://www.catazinelive.catreloaded.net/2012/03/18/how­to­b     
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