Cisco Discovery Protocol (CDP)
CDP is a proprietary protocol developed by Cisco Systems that is used to discover information about other Cisco devices on a network. It is used by Cisco devices to advertise their presence on the network and to share information about other directly connected Cisco equipment, including device type, uptime, IOS version, and IP address. CDP is enabled on switches by default.
Description
Enter into global configuration mode
Enable CDP
Disable CDP
Exit from the configuration mode
Display connected Cisco device neighbors
Display more details of connected Cisco device neighbors
CLI Commands
configure terminal
cdp run
no cdp run
end
show cdp neighbors
show cdp neighbors detail
cdp run
LABSWITCH01#conf t
LABSWITCH01(config)#cdp run
LABSWITCH01(config)#end
LABSWITCH01#
show cdp neighbors
LABSWITCH01#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
LABSWITCH02
Gig 1/1/1 172 S I C9300-24P Gig 1/1/1
Total cdp entries displayed : 1
LABSWITCH01#
show cdp neighbors detail
LABSWITCH01#show cdp neighbors detail
-------------------------
Device ID: LABSWITCH02
Entry address(es):
IP address: 192.20.8.2
Platform: cisco C9300-24P, Capabilities: Switch IGMP
Interface: GigabitEthernet1/1/1, Port ID (outgoing port): GigabitEthernet1/1/1
Holdtime : 158 sec
Version :
Cisco IOS Software [Bengaluru], Catalyst L3 Switch Software (CAT9K_IOSXE), Version 17.6.5, RELEASE SOFTWA RE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2023 by Cisco Systems, Inc.
Compiled Wed 25-Jan-23 16:15 by mcpre
advertisement version: 2
VTP Management Domain: ''
Native VLAN: 1
Duplex: full
Management address(es):
IP address: 192.20.8.2
Total cdp entries displayed : 1
LABSWITCH01#
show cdp neighbors ?
LABSWITCH01#show cdp neighbors ?
AccessTunnel Access Tunnel interface
AppGigabitEthernet App-hosting Gigabit Ethernet
Auto-Template Auto-Template interface
BDI Bridge-Domain interface
Bluetooth Bluetooth interface
CEM-PG Circuit Emulation interface with Protection group
FortyGigabitEthernet Forty Gigabit Ethernet
GMPLS MPLS interface
GigabitEthernet GigabitEthernet IEEE 802.3z
InternalInterface Internal Interface
LISP Locator/ID Separation Protocol Virtual Interface
Lspvif LSP virtual interface
PROTECTION_GROUP Protection-group controller
Port-channel Ethernet Channel of interfaces
SDH_ACR Virtual SDH-ACR controller
SERIAL-ACR Serial interface with ACR
Serial-PG Serial interface with Protection Group
TLS-VIF TLS Virtual Interface
TenGigabitEthernet Ten Gigabit Ethernet
Tunnel Tunnel interface
Tunnel-tp MPLS Transport Profile interface
TwentyFiveGigE Twenty Five Gigabit Ethernet
VirtualPortGroup Virtual Port Group
detail Show detailed information
nve Network virtualization endpoint interface
| Output modifiers
show cdp ?
LABSWITCH01#show cdp ?
entry Information for specific neighbor entry
interface CDP interface status and configuration
neighbors CDP neighbor entries
tlv CDP optional TLVs
tlv-list Information about specific tlv list
traffic CDP statistics
vlan Limit CDP info to interfaces on a given vlan
| Output modifiers
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