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- Cisco_Discovery_Protocol abstract "The Cisco Discovery Protocol (CDP) is a proprietary Data Link Layer protocol developed by Cisco Systems. It is used to share information about other directly connected Cisco equipment, such as the operating system version and IP address. CDP can also be used for On-Demand Routing, which is a method of including routing information in CDP announcements so that dynamic routing protocols do not need to be used in simple networks.Cisco devices send CDP announcements to the multicast destination address 01-00-0c-cc-cc-cc, out each connected network interface. These multicast packets may be received by Cisco switches and other networking devices that support CDP into their connected network interface. This multicast destination is also used in other Cisco protocols such as VTP. By default, CDP announcements are sent every 60 seconds on interfaces that support Subnetwork Access Protocol (SNAP) headers, including Ethernet, Frame Relay and Asynchronous Transfer Mode (ATM). Each Cisco device that supports CDP stores the information received from other devices in a table that can be viewed using the show cdp neighbors command. This table is also accessible via snmp. The CDP table information is refreshed each time an announcement is received, and the holdtime for that entry is reinitialized. The holdtime specifies the lifetime of an entry in the table - if no announcements are received from a device for a period in excess of the holdtime, the device information is discarded (default 180 seconds).The information contained in CDP announcements varies by the type of device and the version of the operating system running on it. This information may include the operating system version, hostname, every address (i.e. IP address) from all protocol(s) configured on the port where CDP frame is sent, the port identifier from which the announcement was sent, device type and model, duplex setting, VTP domain, native VLAN, power draw (for Power over Ethernet devices), and other device specific information. The details contained in these announcements is easily extended due to the use of the type-length-value (TLV) frame format. See external links for a technical definition.Hewlett-Packard removed support for transmitting CDP from HP Procurve products shipped after February 2006 and all future software upgrades. Receiving and processing CDP information is still supported. CDP support was replaced with IEEE 802.1AB Link Layer Discovery Protocol (LLDP), an IEEE standard that is implemented by multiple vendors and is functionally similar to CDP.".
- Cisco_Discovery_Protocol wikiPageExternalLink gpl.internetconnection.net.
- Cisco_Discovery_Protocol wikiPageExternalLink CDP.
- Cisco_Discovery_Protocol wikiPageExternalLink xtocid12.
- Cisco_Discovery_Protocol wikiPageID "1022738".
- Cisco_Discovery_Protocol wikiPageRevisionID "606436461".
- Cisco_Discovery_Protocol hasPhotoCollection Cisco_Discovery_Protocol.
- Cisco_Discovery_Protocol subject Category:Cisco_protocols.
- Cisco_Discovery_Protocol type Abstraction100002137.
- Cisco_Discovery_Protocol type CiscoProtocols.
- Cisco_Discovery_Protocol type Communication100033020.
- Cisco_Discovery_Protocol type Direction106786629.
- Cisco_Discovery_Protocol type Message106598915.
- Cisco_Discovery_Protocol type Protocol106665108.
- Cisco_Discovery_Protocol type Rule106652242.
- Cisco_Discovery_Protocol comment "The Cisco Discovery Protocol (CDP) is a proprietary Data Link Layer protocol developed by Cisco Systems. It is used to share information about other directly connected Cisco equipment, such as the operating system version and IP address.".
- Cisco_Discovery_Protocol label "CDP".
- Cisco_Discovery_Protocol label "Cisco Discovery Protocol".
- Cisco_Discovery_Protocol label "Cisco Discovery Protocol".
- Cisco_Discovery_Protocol label "Cisco Discovery Protocol".
- Cisco_Discovery_Protocol label "Cisco Discovery Protocol".
- Cisco_Discovery_Protocol label "Cisco Discovery Protocol".
- Cisco_Discovery_Protocol label "Cisco Discovery Protocol".
- Cisco_Discovery_Protocol label "Cisco Discovery Protocol".
- Cisco_Discovery_Protocol label "Cisco Discovery Protocol".
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- Cisco_Discovery_Protocol sameAs Q1093194.
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- Cisco_Discovery_Protocol wasDerivedFrom Cisco_Discovery_Protocol?oldid=606436461.
- Cisco_Discovery_Protocol isPrimaryTopicOf Cisco_Discovery_Protocol.