CDP---思科发现协议（二层协议）
发现对端设备信息，即使ip冲突，通过cdp也能发现对端信息R1#showcdp neighborsCapability Codes: R - Router, T - Trans Bridge, B - Source RouteBridge S -Switch, H - Host, I - IGMP, r - RepeaterDevice ID LocalIntrfce Holdtme Capability PlatformPort IDR7 Fas0/0 171 R S I 3640 Fas 0/0R1#showcdp neighbors detail-------------------------Device ID: R7Entry address(es):Platform: Cisco 3640, Capabilities: Router Switch IGMPInterface: FastEthernet0/0, Port ID (outgoing port): FastEthernet0/0Holdtime : 155 secVersion :Cisco IOS Software, 3600 Software (C3640-JK9O3S-M), Version12.4(7a), RELEASE SOFTWARE (fc3)Technical Support: http://www.cisco.com/techsupportCopyright (c) 1986-2006 by Cisco Systems, Inc.Compiled Mon 24-Apr-06 23:37 by ssearchadvertisement version: 2VTP Management Domain: ''Duplex: full
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