I did a cdp neighbors and it is showing me 3 different equipment in the same interface
MAPCO-MDF-SW05#sh cdp ne gi2/0/39 det
-------------------------
Device ID: SW1
Entry address(es):
IP address: 10.130.4.1
Platform: cisco WS-C3850-24T, Capabilities: Router Switch IGMP
Interface: GigabitEthernet2/0/39, Port ID (outgoing port): GigabitEthernet1/0/24
Holdtime : 147 sec
Version :
Cisco IOS Software [Denali], Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 16.3.6, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2018 by Cisco Systems, Inc.
Compiled Wed 28-Feb-18 15:23 by mcpre
advertisement version: 2
VTP Management Domain: ''
Duplex: full
Management address(es):
IP address: 10.130.4.1
-------------------------
Device ID: STK1
Entry address(es):
IP address: 10.1.0.8
Platform: cisco WS-C2960X-48FPD-L, Capabilities: Switch IGMP
Interface: GigabitEthernet2/0/39, Port ID (outgoing port): GigabitEthernet3/0/48
Holdtime : 123 sec
Version :
Cisco IOS Software, C2960X Software (C2960X-UNIVERSALK9-M), Version 15.2(2)E7, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2017 by Cisco Systems, Inc.
Compiled Wed 12-Jul-17 13:06 by prod_rel_team
advertisement version: 2
Protocol Hello: OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=00000000FFFFFFFF010221FF0000000000007001B5C70180FF0000
VTP Management Domain: ''
Native VLAN: 998
Duplex: full
Management address(es):
IP address: 10.1.0.8
-------------------------
Device ID: VEGASSW
Entry address(es):
IP address: 192.168.19.16
Platform: cisco WS-C3560CX-8TC-S, Capabilities: Router Switch IGMP
Interface: GigabitEthernet2/0/39, Port ID (outgoing port): GigabitEthernet0/1
Holdtime : 174 sec
Do you know why this is happening?
