SampleCaptures/cdp.pcap Capture of a CDP v1 frame transmitted by a router. Keep this file short, it's also a good idea to gzip it to make it even smaller, as Wireshark can open gzipped files automatically. XXX - Add a simple example capture file to the SampleCaptures page and link from here (see below). There are no CDP specific preference settings. Also add info of additional Wireshark features where appropriate, like special statistics of this protocol. The CDP dissector is fully functional (as far as I can tell).
Sent through Interface: GigabitEthernet0/21
#Cisco switch port numbering software#
Software Version: Cisco IOS Software, C3560 Software (C3560-ADVIPSERVICESK9-M), Version 12.2(44)SE, RELEASE SOFTWARE (fc1)Ĭopyright (c) 1986-2008 by Cisco Systems, Inc. = IG bit: Individual address (unicast)Ĭhecksum: 0x7256 = LG bit: Globally unique address (factory default) = IG bit: Group address (multicast/broadcast) Time since reference or first frame: 2.641698000 secondsĪnother example: Frame 1 (417 bytes on wire, 417 bytes captured)ĭestination: CDP/VTP/DTP/PAgP/UDLD (01:00:0c cc:cc)Īddress: CDP/VTP/DTP/PAgP/UDLD (01:00:0c cc:cc) Time delta from previous packet: 2.641698000 seconds Software Version: Cisco Internetwork Operating System Software 11 = Frame type: Unnumbered frame (0x03) Time since reference or first frame: 0.000000000 seconds Time delta from previous packet: 0.000000000 seconds $ sudo tshark -i eth0 -V -f "ether host 01:00:0c cc:cc" -c 2įrame 1 (386 bytes on wire, 386 bytes captured) XXX - Add example traffic here (as plain text or Wireshark screenshot). PPP: CDP is encapsulated over PPP with a protocol type of 0x0207. LLC/ SNAP: CDP is encapsulated as LLC/SNAP with an OUI of 0x00000C and a protocol ID of 0x2000.Ĭisco HDLC: CDP is encapsulated over Cisco HDLC with a protocol type of 0x2000. XXX - add a brief description of CDP history (see third external link for a detailed history) Protocol dependencies The purpose of the protocol is to supply a network entity with information about its direct connected neighbors. CDP (Cisco Discovery Protocol) is a Cisco proprietary protocol that runs between direct connected network entities (routers, switches, remote access devices, IP telephones etc.).
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