1. Managing Your Network Environment
1. Getting Information About Neighboring Devices.
2. Getting Information About Remote Devices.
3. Router Booting Sequence and Verification Commands.
4. Managing IOS Images.

2. 1. Getting Information About Neighboring Devices
Cisco Discovery Protocol (CDP)
Cisco Discovery Protocol (CDP) is a Cisco proprietary protocol used for neighbor discovery
CDP will only show information about directly connected neighbors but it is still a powerful tool
CDP is a Layer 2 (data link) protocol

3. 1. Getting Information About Neighboring Devices
Cisco Discovery Protocol (CDP)
CDP Version 2 (CDPv2) is the most recent release of the protocol. Cisco IOS Release 12.0(3)T or later supports CDPv2
When a Cisco device boots up, CDP starts up automatically and allows the device to detect neighbor devices that use CDP

4. 1. Getting Information About Neighboring Devices
Cisco Discovery Protocol (CDP)
Each router that uses CDP exchanges protocol information with its neighbors
The network administrator can display the results of this CDP information exchange on a console that is connected to a local router
An administrator can use the show cdp neighbors command to display information about the networks that are directly connected to a router

5. 1. Getting Information About Neighboring Devices
Cisco Discovery Protocol (CDP)
CDP transmits type length values (TLVs) to provide information about each CDP neighbor device
Device TLVs displayed by the show cdp neighbors command include the following:
Device ID
Local Interface
Holdtime
Capability
Platform
Port ID

6. 1. Getting Information About Neighboring Devices
Cisco Discovery Protocol (CDP)
The following TLVs are only included in CDPv2:
- VTP management domain name
- Native VLAN
- Full or half-duplex

7. 1. Getting Information About Neighboring Devices
Creating a Network Map
The information given by CDP can be used to create a network map of the connected devices
To discover devices that are connected to neighbor devices, use Telnet to connect to the neighbors. Then use the show cdp neighbors command

8. 1. Getting Information About Neighboring Devices

9. 1. Getting Information About Neighboring Devices
Implementation and Monitoring of CDP
Router(config)# cdp run
==> Enables CDP globally on a router. By default, CDP is globally enabled
Router(config-if)# cdp enable
==> Enables CDP on a particular interface. On Cisco IOS Release 10.3 or higher, CDP is enabled by default on all supported interfaces
Router# show cdp traffic
==> displays traffic counters
Router# clear cdp counters
==> Resets traffic counters to zero

10. 1. Getting Information About Neighboring Devices
Disabling CDP
Router(config)# no cdp run
==> Used to disable CDP at the global level
Router(config-if)# no cdp enable
==> Used to disable CDP on a specific interface

11. 1. Getting Information About Neighboring Devices
Troubleshooting CDP

12. 2. Getting Information About Remote Devices
+ How to use Telnet on network devices and how to gather information about the connections between those devices. The network is now physically connected and is running properly. + To accomplish this objective, you will perform the following tasks: a) Connect to remote routers using Telnet; b) Get user information on networks connected to remote routers; c) Verify network connectivity between remote routers.

13. 2. Getting Information About Remote Devices
Telnet allows remote connections to distant devices.
You open a Telnet session by entering the telnet or connect command, followed by the target device’s IP address or host name.
The show sessions command displays a list of connected hosts, their IP addresses, their byte counts, the idle time, and the session name.
Use the show user command to list all active Telnet sessions.
To reestablish a suspended Telnet session, press the Enter key, use the resume command (for the most recent session), or use the resume session number command. (Use show session to get session numbers.)
The ping and trace commands can be used to obtain information about network devices and to check for connectivity.

14. 2. Getting Information About Remote Devices
The Telnet connection will terminate after ten minutes of inactivity by default or when the exit or logout command is entered at the EXEC prompt
Telnet can be used to determine if a remote router can be accessed. A successful Telnet connection indicates that the upper-layer application functions properly

15. 2. Getting Information About Remote Devices
Multiple Telnet sessions

16. 3. Router Booting Sequence and Verification Commands
Stages of the router power-on boot sequence

17. 3. Router Booting Sequence and Verification Commands
Router Boot Process – At a Glance

18. 3. Router Booting Sequence and Verification Commands
Check for IOS boot system commands

19. 3. Router Booting Sequence and Verification Commands
Configuration register

20. 3. Router Booting Sequence and Verification Commands

21. 3. Router Booting Sequence and Verification Commands
Modifying the configuration register

22. 3. Router Booting Sequence and Verification Commands
Troubleshooting

23. IOS file system overview
4. Managing IOS Images
IOS file system overview

24. Cisco IOS File System (IFS)
4. Managing IOS Images
Cisco IOS File System (IFS)

25. Cisco IOS File System (IFS)
4. Managing IOS Images
Cisco IOS File System (IFS)

26. Cisco Traditional Copy commands
4. Managing IOS Images
Cisco Traditional Copy commands

27. IOS naming conventions
4. Managing IOS Images
IOS naming conventions

28. 4. Managing IOS Images
Example

29. Managing configuration files using TFTP
4. Managing IOS Images
Managing configuration files using TFTP

30. Restoring the IOS image from Flash
4. Managing IOS Images
Restoring the IOS image from Flash

31. Download using TFTP from ROMmon
4. Managing IOS Images
Download using TFTP from ROMmon

32. Download using TFTP from ROMmon
4. Managing IOS Images
Download using TFTP from ROMmon