Packet Tracer 4.0 Activity: Lab 4.1.6 Using CDP Commands - Solution
Objective

Use CDP to obtain information about neighboring Cisco devices.

Display information on how CDP is configured for its advertisement and discovery frame
transmission.

Disable CDP on an interface and globally on the router.
Scenario
This topology represents a basic routed network with two locations.
Required Files
To complete this lab, you will need the following files.

4.1.6_UsingCDPCommands.pka
Plan:
Familiarize yourself with PT 4.0 help menu, in case you have questions. Open
4.1.6_UsingCDPCommands.pka and follow the Instructions, which are repeated below:
Act:
Step 1 Display the values of the CDP timers, the interface status and encapsulation used.
a. Enter show cdp interface at the GAD router cli prompt.
b. How often is the router sending CDP packets? every 60 seconds
c.
What is the holdtime value? 180 seconds
d. Global CDP settings can be seen using the show cdp by itself.
e. What information is not displayed in the show cdp command that is displayed in the show cdp
interface command?
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Packet Tracer 4.0 Activity
Copyright  2006, Cisco Systems, Inc.
The status of the interface and its line protocol
Step 2 Display the CDP updates received on the local router.
a. Enter show cdp neighbors at the GAD router cli prompt.
b. Fill in the information in the following table.
Device ID
Local interface
Hold Time
Capability
Platform
Port ID
BHM
Serial0/0
Varies
R
C2600-I-M
Serial0/0
Step 3 Display details about updates received on the local router.
a. Enter show cdp neighbors detail at the GAD router cli prompt.
b. Fill in the information in the following table.
Information Gathered
Remote Device
Neighbor Device Name
BHM
Neighbor Device type
Router
IP Address of Interface Attached to Your Router
192.168.15.2
Port ID of Your Router That the Neighbor IS On
Serial0/0
Port ID of Neighbor Router That Your Router Is On
Serial0/0
IOS Version of Neighbor Router
(C2600-I-M), Version 12.2(28)
Step 4 Disable CDP on selected interfaces and globally on a router.
a. For security reasons CDP should advertisements should not be sent out interfaces that do not
connect to other Cisco devices. Prevent the sending of advertisements on the FastEthernet
interfaces on both routers.
b. From what mode is this command issued? Interface configuration mode
c.
What is the command? no cdp enable
d. Disable CDP globally on both routers.
e. From what mode is this command issued? Global configuration mode
f.
What is the command? no cdp run
g. Verify your configuration by clicking the Check Results button.
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Packet Tracer 4.0 Activity
Copyright  2006, Cisco Systems, Inc.