Copyright CCNA 2 Chapter 13 Learning About Other Devices By Your Name

Copyright Objectives Overview Getting information about remote devices

Copyright Using the Cisco Discovery Protocol (CDP) Showing CDP neighbor entries A CDP configuration example Showing CDP entries for a device Showing CDP neighbors

Copyright Cisco Discovery Protocol (CDP) CDP is media and protocol independent, and runs on all Cisco equipment over the Subnetwork Access Protocol (SNAP). CDP Version 2 (CDPv2) is the most recent release of the protocol. Cisco IOS Software (Release 12.0(3)T or later) supports CDPv2. CDP Version 1 (CDPv1) is enabled by default with Cisco IOS Software (Release 10.3 to 12.0(3)T).

Copyright Showing CDP Neighbor Entries

Copyright CDP Configuration Example

Copyright The show cdp neighbors Command

Copyright Implementation, Monitoring, and Maintenance of CDP The following commands are used to implement, monitor and maintain CDP information: cdp run cdp enable clear cdp counters show cdp show cdp entry entry-name [protocol | version] show cdp interface [type number] show cdp neighbors [type number] [detail]

Copyright Creating a Network Map The show cdp neighbors [type number] [detail] command can be used to obtain the following: Device ID Address Port ID Capabilities Version Platform IP network prefix VTP management domain name (CDPv2 only) Native VLAN (CDPv2 only) Full/Half duplex (CDPv2)

Copyright Disabling CDP To disable CDP on a specific interface after it has been enabled, use the no cdp enable command in interface configuration mode.

Copyright Troubleshooting CDP show cdp clear cdp table show cdp traffic show debugging debug cdp cdp timers cdp holdtime debug cdp adjacency debug cdp events debug cdp ip debug cdp packets

Copyright Getting Information about Remote Devices

Copyright Telnet

Copyright Disconnecting and Suspending Telnet Sessions

Copyright Establishing Telnet Connections A host name table or access to DNS for Telnet must be present for a name to work. Otherwise, the IP address of the host must be entered. Denver>connect paris Denver>paris Denver> Denver>telnet paris Telnet can be used to perform a test to determine whether access can be obtained from a remote router.

Copyright Advanced Telnet Multiple Telnet sessions can be used and suspended by using the Ctrl+Shift+6 and x sequence.

Copyright The ping Command

Copyright The trace Command