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Learning about Neighboring and Remote Devices

Learning about Neighboring and Remote Devices. PJC CCNA Semester 2 Ver. 3.0 by William Kelly. Cisco Discovery Protocol (CDP) Basics. CDP’s primary purpose is to discover all directly connected Cisco devices CDP is a layer 2 protocol linking physical layer and upper layer protocols

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Learning about Neighboring and Remote Devices

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  1. Learning about Neighboring and Remote Devices PJC CCNA Semester 2 Ver. 3.0 by William Kelly

  2. Cisco Discovery Protocol (CDP) Basics • CDP’s primary purpose is to discover all directly connected Cisco devices • CDP is a layer 2 protocol linking physical layer and upper layer protocols • CDP provides info. about connected devices, the model number of those devices, and the connected interfaces • CDP is a Cisco proprietary protocol • CDP is media and protocol independent (can learn info. even if other devices use different protocols) • CDP v2 is the most recent release and runs on IOS 12.0(3) and later

  3. Common CDP Commands

  4. Info. from show cdp neighbors Command • Device ID • Address • Port ID • Capabilities • Version • Platform • IP Network Prefix • VTP Management Domain Name (CDPv2 only) • Native VLAN (CDP v2 only) • Full/Half-Duplex (CDPv2 only)

  5. Overview of Testing

  6. Telnet and Advanced Telnet • Telnet is used to verify the application layer between the source and the destination • A router can have 5 simultaneous telnet sessions (vty 0 – 4) • Telnet depends on the TCP to accurately deliver the data • Ctrl + Shift + 6 followed by hitting the letter x will escape the current telnet session • The show sessions command will display all the current telnet sessions • The resume session# will resume a particular telnet session

  7. Alternate Connectivity Tests • ping • traceroute • show ip route • show interfaces serial • show interfaces/clear counter • debug

  8. The ping Command • Ping is an echo protocol that helps evaluate path reliability • Ping is used to troubleshoot lower level OSI connectivity • The basic ping can be used in both the user and privileged mode

  9. Ping Return Codes

  10. The traceroute Command • Traceroute follows the route data travels through a network and can be used to find broken network connections (broken end to end connectivity) • Traceroute can be used at the user and privileged level • Traceroute operates by sending pings with ever increasing Time to Live (TTL) values • Ctrl-Shift-6 can be used to cancel a traceroute

  11. Traceroute Return Codes

  12. The show ip route Command • The show ip route command lists the map the router has constructed to switch packets • The output of this command is referred to as the routing table

  13. The show interfaces serial Command • The show interfaces serial command displays information about the serial connection between two routers • The hardware including cables and interfaces • The software including protocols

  14. The states of a serial interface • Serial0 is up, line protocol is up – OPERATIONAL • Serial0 is up, line protocol is down – CONNECTION PROBLEM • Serial0 is down, line protocol is down – INTERFACE PROBLEM • Serial0 is administratively down, line protocol is down - DISABLED

  15. Debug Commands • Debug all should not be used on a production router as it will slow down or crash your network • Use debug ? to find the appropriate debug command • Use undebug all to turn off all debugging

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