Semester 2 v3'1'1: Routers and Routing Basics

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Semester 2 v3.1.1Routers and Routing Basics

• MODULE 4
• Learning About Other Devices

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Who Else Is Out There?

• Cisco Discovery Protocol (CDP)
• Layer 2 protocol that transmits to discover
  information about directly connected Cisco
  devices.
• Media and protocol independent.
• Transmits type length values (TLVs) embedded in
  CDP advertisements over Subnetwork Access
  Protocol (SNAP)
• CDP is enabled by default in IOS 10.3 and later.

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Discovering Your Network

• Router show cdp neighbors
• CDPv1 available on IOS 10.3 to 12.0(3)T
• Includes reporting on device ID, what interface
  and port its directly connected to, capability,
  and platform.
• CDPv2 available from IOS 12.0(3)T and later
• Includes reporting on VTP management domain
  membership, native VLAN, and half/full duplex
  mode.

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Take Command of CDP

• Router show cdp entry cdp-device-name
• Router show cdp traffic

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Time to Test with Telnet

• CDP only gathers information about other devices
• Telnet allows us to establish virtual terminal
  sessions with other devices.
• Provides remote login capabilities on
  telnet-enabled devices via virtual terminal
  lines.
• Facilitates remote device management.
• Operates at Application Layer (OSI Layer 7)
• Most complete form of connection verification
  available.

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Making the Connection?

• A successful telnet session to a remote router
  indicates functionality at all layers.
• Possible issues include access permissions,
  naming, logical addressing.
• Successful ping using router name indicates name
  resolved correctly.
• Incorrect access permissions
• Successful ping using router logical address
  indicates functioning path determination.
• Incorrect entry in host name table.
• Consider using traceroute to test all hops
  between source and destination.
• Ping tests end-to-end connectivity.

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Welcome to my world )

• Daniel Comarmond
• CCNP, CCDP, CCSP, CCAI
• Cisco Networking Academy Instructor
• Systems Engineer Cisco Systems
• E-Mail dcom_at_it.uts.edu.au
• MSN dcom82_at_dcom82.com
• Phone [phone]
• Website http//www-staff.it.uts.edu.au/dcom
• Take care, and SMILE!!! )