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.

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

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

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

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

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

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

1. Getting Information About Neighboring Devices

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

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

1. Getting Information About Neighboring Devices Troubleshooting CDP

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.

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.

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

2. Getting Information About Remote Devices Multiple Telnet sessions

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

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

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

3. Router Booting Sequence and Verification Commands Configuration register

3. Router Booting Sequence and Verification Commands

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

3. Router Booting Sequence and Verification Commands Troubleshooting

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

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

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

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

IOS naming conventions 4. Managing IOS Images IOS naming conventions

4. Managing IOS Images Example

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

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

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

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