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CDP

CDP. Introduction to CDP. Layer 2 protocol that connects lower physical media and upper network layer protocols used to obtain information about neighboring devices, such as the types of devices connected router interfaces they are connected to interfaces used to make the connections

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CDP

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  1. CDP

  2. Introduction to CDP • Layer 2 protocol that connects lower physical media and upper network layer protocols • used to obtain information about neighboring devices, such as the • types of devices connected • router interfaces they are connected to • interfaces used to make the connections • model numbers of the devices.

  3. Introduction to CDP • device configured for CDP sends periodic messages, known as advertisements, to multiple routers • device advertises at least one address at which it can receive Simple Network Management Protocol (SNMP) messages • advertisements also contain “time-to-live” or holdtime information, indicating the length of time that receiving devices should hold CDP information before discarding it • each device listens to periodic CDP messages sent by others in order to learn about neighboring devices

  4. Information obtained with CDP • router that is running CDP exchanges protocol information with its neighbors • administrator display the results of this CDP information exchange on a console that is connected to a local router • uses the show cdp neighbors command to display information about the networks directly connected to the router • CDP provides information about each CDP neighbor device by transmitting type length values (TLVs), which are blocks of information embedded in CDP advertisements

  5. Information obtained with CDP • Device TLVs displayed by the show cdp neighbors command include the following: • Device ID • Local Interface • Holdtime • Capability • Platform • Port ID • VTP Management Domain Name (CDPv2 only) • Native VLAN (CDPv2 only) • Full/Half-Duplex (CDPv2 only)

  6. Implementation, monitoring, and maintenance of CDP

  7. Troubleshooting CDP • The following commands can be used to show the version, update information, tables, and traffic: • • clear cdp table • • clear cdp counters • • show cdp traffic • • show debugging • • debug cdp adjacency • • debug cdp events • • debug cdp ip • • debug cdp packets • • cdp timer • • cdp holdtime • • show cdp

  8. Telnet • Telnet is a virtual terminal protocol that is part of the TCP/IP protocol suite. • It allows connections to be made to remote hosts. • The verification of application layer connectivity is a by-product of Telnet.

  9. Establishing and verifying a Telnet connection • Denver>connect paris • Denver>paris • Denver>131.108.100.152 • Denver>telnet paris

  10. Disconnecting and suspending Telnet sessions

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

  12. Alternative connectivity tests • ping command sends a packet to the destination host and then waits for a reply packet from that host Each exclamation point (!) indicates a successful echo. Each period (.) on the display indicates that the application on the router timed out while it waited for a packet echo from a target.

  13. Alternative connectivity tests • traceroute command is similar to the ping command, except that instead of testing end-to-end connectivity, traceroute tests each step along the way The traceroute command will attempt to reach the next step until the Ctrl-Shift-6 escape sequence is used.

  14. ping uses the ICMP protocol to verify the hardware connection and the IP address of the network layer. • telnet verifies the application layer software between a source and a destination. • traceroute locates failures in a path from a source to a destination. This command uses Time to Live values to generate Troubleshooting IP addressing issues

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