Cisco Discovery Protocol (CDP) is a proprietaryData 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 destination MAC address01:00:0c:cc:cc:cc, out each connected network interface. These multicast frames 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 Virtual Local Area Network (VLAN) Trunking Protocol (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 Simple Network Management Protocol (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).
With Netdisco you can locate the switch port of an end-user system by IP or MAC address. Data is stored using a SQL database for scalability and speed. Layer-2 topology protocols such as CDP (Cisco Discovery Protocol) optionally provides automatic discovery of the network topology.
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.[1]
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Several other manufacturers, including Dell and Netgear have used the brand-neutral name Industry Standard Discovery Protocol (ISDP) to refer to their implementations of a CDP-compatible protocol.
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CDP was the abbreviation used by Cabletron who wrote the RFC 2641 for the discovery protocol. Cabletron's VlanHello Protocol Specification Version 4
See also[edit]
References[edit]
- ^Alternative Features for Link Aggregation and Device Discovery (End of Support for FEC and CDP)
External links[edit]
- Breakdown and explanation of a CDP packet by Wireshark packet sniffer.
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CDP Cisco Client is a highly efficient network monitor and troubleshooting tool for network administrator and network engineer. First, CDP Cisco Client is a CDP Client for windows host. It is able to use the CDP(Cisco Discovery Protocol) to send host. ..
- cdpclient_setup.zip
- TallSoft
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- 1.07 Mb
- Windows 2003, XP, 2000, 98, Me, NT
Cisco CDP Monitor is an efficient network diagnostic and troubleshooting tool. It is very useful for network administrator and network engineer.At first, Cisco CDP Monitor is a Cisco CDP Client for windows host. It is able to use the CDP(Cisco. ..
- cdpmonitor_setup.exe
- TallSoft
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- 963 Kb
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CDP Dissector is a plugin for Wireshark (the network protocol capture and analyzer tool) CDP Dissector is a plugin for Wireshark (the network protocol capture and analyzer tool) to dissect and analyze the UDP-based proprietary CDP protocol (Control Design Platform) from Industrial Control Design.
- CDPDissectorV2.zip
- menthal
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- 768 Kb
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CDP Dissector is a plugin for Wireshark (the network protocol capture and analyzer tool) to dissect and analyze the UDP-based proprietary CDP protocol (Control Design Platform) from Industrial Control. ..
Ipconfig tool for mac. Good luck out there, and stay salty. Mac Network Commands Cheat Sheet After writing up the presentation for MacSysAdmin in Sweden, I decided to go ahead and throw these into a quick cheat sheet for anyone who’d like to have them all in one place.
- CDPDissectorV2.zip
- cdpdissector
- Freeware (Free)
- 765 Kb
- Windows; Linux
cdpr is used to decode a Cisco Disovery Protocol (CDP) packet. cdpr is used to decode a Cisco Disovery Protocol (CDP) packet, by default it will report the device ID, the IP Address (of the device), and the port number that the machine is connected to. Optionally it will decode the entire CDP packet.
- cdpr-2.4.tgz
- Lance O'Connor
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EzRollback CDP restores an entire folder of files like a full backup EzRollBack CDP restores an entire folder of files like a full backup at any restore pointOther low-cost CDP software in market can restore only the changed files at a restore point. Ezrollback allows you to restore the entire folder of files or a group of project files, changed or not, at a restore point.
- XLinkEzRollBack_cdp.exe
- XLink Technology, Inc.
- Shareware ($)
- 6.79 Mb
- WinXP, Win2003, Window2008, Windows 7
Program designed to be run as a software deployment from SCCM that will capture CDP packets on the clients Program designed to be run as a software deployment from SCCM that will capture CDP packets on the clients, parse them and then inject that data into WMI where it can be retrieved by SCCM and reported to admins.If you find this useful feel free to donate, beer funds are always well received.
- CDPtoWMI.exe
- ryan1_00
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- 40 Kb
- Win All
cdp is a console-mode CD player for linux which can be used either through an interactive, ncurses-based system, or a command-line system suitable for cdp is a console-mode CD player for linux which can be used either through an interactive, ncurses-based system, or a command-line system suitable for scripting.
- cdp-0.33.tar.gz
- cdp
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This block level CDP module has introduced the concept of Time Addressable Storage in the world of Open Source. It provides continuous data protection and also ensures both physical and logical data protection. It also provides dynamic recovery points.
- sourceforge_nogui.zip
- Phoenix
- Freeware (Free)
- 10 Kb
- BSD; Linux
ScanCDP extracts informations from .cdp Auran Trainz files. See README for details.
Free microsoft excel for mac. The z-Test: Two Sample for Means analysis tool performs a two sample z-Test for means with known variances.
- scancdp12.zip
- trainz-scancdp
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- 199 Kb
- N/A
Backup solution with agentless backups of remote computers, patch technology, Disaster Recovery, Continues Data Protection (CDP), encryption and database backups allows you to protect your information everywhere, anytime - at home, at work, or on the. ..
- EaseBackup
- KieSoft
- Shareware ($29.95)
- 3.05 Mb
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Cisco Snmp Tool is a Freeware Cisco Configuration Management Application. After Version2.0 Beta there is a map interface which supports visual design of your network. Program can be used at LAN and WAN networks.
- ciscosnmptool-v2.2.zip
- Billy TheKid's Freeware
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Related:Windows Cdp Tool - Cdp Client Windows - Cdp Client - Audio File Cdp - Trainz Cdp Batcher