![]() 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). This multicast destination is also used in other Cisco protocols such as Virtual Local Area Network (VLAN) Trunking Protocol (VTP). ![]() These multicast frames may be received by Cisco switches and other networking devices that support CDP into their connected network interface. 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.Ĭisco devices send CDP announcements to the destination MAC address 01:00:0c:cc:cc:cc, out each connected network interface. It is used to share information about other directly connected Cisco equipment, such as the operating system version and IP address. Cisco Discovery Protocol Communication protocolĬisco Discovery Protocol ( CDP) is a proprietary data link layer protocol developed by Cisco Systems in 1994 by Keith McCloghrie and Dino Farinacci.
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