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CDP is enabled, by default, on all Cisco devices CDP updates are generated as multicasts every 60 seconds with a hold-down period of 180 seconds for a missing neighborThe no cdp run command globally disables CDP, while the no cdp enable command disables CDP on an interface (you should do this on a
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device s interface connected to the Internet or untrusted devices) Use show cdp neighbors to list your directly connected Cisco neighboring devices Adding the detail parameter will display the layer 3 addressing, device model, software version, and other information con gured on the neighbor
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As you saw in the preceding section, CDP can be very useful in determining whether the data link layer is working correctly with another directly-connected Cisco device You can even see the layer 3 address(es) configured on your neighboring device and use this for testing layer 3 connectivity In addition to using CDP, you could also use the show interfaces command for data link layer testing ( 11) However, the main limitation of these two tools is that they don t test layer 3 problems Cisco does offer tools for testing layer 3 connectivity, however This section focuses on two of these commands: ping and traceroute Both of these commands come in two versions: one for User EXEC mode and one for Privilege EXEC mode The Privilege EXEC version provides additional options and parameters that can assist you in your troubleshooting process The following sections cover these tools in more depth
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Ping (Packet Internet Groper) was originally developed for the IP protocol stack to test layer 3 connectivity The Internet Control Message Protocol (ICMP) is used to implement ping However, Cisco s IOS has expanded the ping command to support other protocols, including Apollo, AppleTalk, CLNS, DECnet, IP, IPX, Vines, and XNS Cisco uses ping to test layer 3 connectivity with other, non-IP protocols in a (typically) proprietary fashion However, Cisco follows the standard when using ping to test IP connectivity
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Ping was originally never intended to be an acronym It was developed by Mike Muuss, who named it ping simply because it worked like sonar Later on, David Mils created an acronym for it: Packet Internet Groper Muuss was, apparently, not amused by the acronym
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Ping uses ICMP echo messages to initiate the test If the destination is reachable, the destination responds with an echo reply message for each echo sent by the source If the destination is not reachable, an
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intermediate router, if it exists, will respond with a destination unreachable message, indicating where the problem begins Both the ping and traceroute commands test layer 3 connectivity
Simple ping Command To execute a simple ping from either User mode or Privilege EXEC mode, enter the ping command on the CLI and follow it with the IP address or hostname of the destination:
IOS> ping destination_IP_address_or_host_name
Here is a simple example of using this command:
IOS> ping 192168110 Type escape sequence to abort Sending 5, 100-byte ICMP Echos to 192168110, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 2/4/6 ms
In this example, five test packets were sent to the destination and the destination responded to all five, as is shown by the exclamation marks (!) The default timeout to receive a response from the destination is 2 seconds if a response is not received from the destination for a packet within this time period, a period () is displayed Table 17-4 shows examples of ping messages that you might see in displayed output The bottom of the output shows the success rate how many replies were received and the minimum, average, and maximum round-trip times for the ping packets sent (in milliseconds) This information can be used to detect whether a delay exists between you and the destination
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