It will also show me the local interface that is connected on my side. Over on the right, the port ID is the interface that it is plugged into on the far side device. It also says what the platform of that device is. I can see here my router and its IP address. This again is very useful if you need to find out an IP address of a neighbor so that you can Telnet or SSH onto it for troubleshooting. It also tells me the platform it's running on, the IOS version is running on there as well, and some other similar information.
If I hit the space bar I can scroll through and I can see the information for the other devices as well.
It's still going to do it on the other interfaces though, so usually, I would do that if this was facing an external entity. So, it's supported on most vendors' devices, and it provides similar information to CDP. Usage Guidelines To use this command, you must be in a user group associated with a task group that includes the proper task IDs.
Task ID Operations cdp read, write. Command Default Version 2 is enabled. Command Modes Global configuration. Range is 10 to Command Default seconds : Examples The following example shows how to specify that the CDP packets sent from the networking device are held by the receiving device for 60 seconds before being discarded.
Command Default CDP adjacency table logging is disabled. A lower timer setting causes CDP updates to be sent more frequently. Related Commands Command Description cdp holdtime Specifies the time for which the receiving device should hold a CDP packet sent by your networking device before discarding it.
Command Default The counters are set to zero. Examples The following example shows how to clear CDP counters. Command Default No default behavior or values. Examples The following example shows how to clear and resize the CDP table. Release 3. Task ID Operations cdp read. Sending a holdtime value of 30 seconds Time for which the device directs the neighbor to hold a CDP advertisement before discarding it.
Sending CDPv2 advertisements is not enabled State of being enabled or disabled for the transmission of CDP version 2-type advertisements. Command Default This command displays information about a particular device that has been discovered by CDP.
Examples The following example shows sample output from the show cdp entry command. Entry address es Addresses of the platform, selected interface, and port ID. Platform Platform name. Capabilities Special functions that the platform can perform in this case the platform is a trans-bridge switch. Port ID outgoing port Location of the port in use by the interface. Holdtime Time in seconds for which the device directs the neighbor to hold a CDP advertisement before discarding it.
Version Software version. Duplex Duplex setting: half or full. Note Use the show interfaces command to see a list of all interfaces currently configured on the router. Command Default This command displays information about the interfaces on which CDP has been enabled. Examples The following example shows sample output from the show cdp interface command. Holdtime is seconds Time for which the device directs the neighbor to hold a CDP advertisement before discarding it.
Device ID Name of the neighbor device. Local Intrfce Protocol being used by the connectivity media and the interface number. Holdtme Remaining time, in seconds, for which the current device holds the CDP advertisement from a sending router before discarding it.
Port ID Protocol and port number of the device. Entry address es List of network addresses of neighbor devices. Platform Product name and number of the neighbor device. Capabilities Device type of the neighbor. Interface Interface being used by the connectivity medium.
Port ID Port number of the port on the current device. Holdtime Remaining time in seconds for which the current device holds the CDP advertisement from a sending router before discarding it. Version Software version of the neighbor device. Input Number of CDP advertisements received by the local device. Hdr syntax Number of CDP advertisements having bad headers that have been received by the local device.
Chksum error Number of times the checksum verifying operation failed on incoming CDP advertisements. Encaps failed Number of times CDP failed to send advertisements on an interface because of a failure caused by the bridge port of the local device. No memory Number of times that the local device did not have enough memory to store the CDP advertisements in the advertisement cache table when the device was attempting to assemble advertisement packets for transmission and parse them when receiving them.
Since it is a layer two protocol, these packets frames are not routed. This document is not restricted to specific software and hardware versions. The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared default configuration. If your network is live, make sure that you understand the potential impact of any command.
Use the command no cdp run to disable CDP globally:. The following five commands all achieve the same result: the attempt to connect remotely to the router named Paris at IP address Enter if ip host command was used previously to create a mapping of an IP address to the word paris.
As long as vty password is set. See the Caution following this table. Moves to line configuration mode for vty lines
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