CDP is showing the wrong information.

[amjadkhan1920]

dear all,

i have one core switch 3800 and access 2960 there is no loops no stp no ether channel no hub not bridge  straight connectivity with each other (point to point ) but once i put the show cdp neighbor on core it show me one switch with tow ports while going to the access layer and show it show correct any idea please  

[paul driver]

Hello

Just to confirm you have these switches directly connected to each (1 or 2 links?) and you don't see an cdp information - correct?

Can you post what you see.

[amjadkhan1920]

dear ,

there is nothing elase one uplink  but cdp show the one access switch with two ports while physical it connected to only one ports 

[amjadkhan1920]

dear ,

there is nothing elase one uplink  but cdp show the one access switch with two ports while physical it connected to only one ports 

[Mark Malone]

Hi
Can you provide the out puts please from both switches so we can see what your looking at , usually on switches it works fine unless you have hit an odd bug ,simulators have issues alright sometimes

[amjadkhan1920]

dear i clear arp cdp nei  still same please find the pic it show the core switch two while the access show correct 

please keep mind on selected color (yellow 

[paul driver]

Hello

Are you sure those are the same switches and not different switches just with the same host name?

[amjadkhan1920]

yes these are the same switches with same model this is just few switches and i connected my self before it was working on copper now i migrate to fiber and remove all the copper physically i checked from core to every access only one up link  there is no backup even on core as well as access layer and stp showing root and designated this means nothing in alt blocking 

[amjadkhan1920]

dear ,

2ndly one ports from core ten1/0/8  is showing two switch with one ports this is only possible when hub or bridge is connected but i checked my self nothing directly connectivity as er below ITcab 2 and ITcab 3 having only one one uplink but it show two ports 

CORETWO#sh cdp nei
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
IT-SW1 Ten 1/0/9 148 S I WS-C3560- Gig 0/3
3RD_simen Ten 1/0/4 179 S I WS-C2960S Gig 1/0/27
IT-SW2 Ten 1/0/10 137 S I WS-C3560- Gig 0/3
CORESWITCH Ten 1/0/1 120 R S I WS-C4507R Gig 5/1
IT_Cabinet_3_2 Ten 1/0/6 133 S I WS-C2960S Gig 1/0/27
IT_Cabinet_3_2 Ten 1/0/8 133 S I WS-C2960S Gig 1/0/27
IT_Cabinet1 Ten 1/0/5 152 S I WS-C2960G Gig 0/23
IT_Cabinet2 Ten 1/0/3 141 S I WS-C2960G Gig 0/24
IT_Cabinet2 Ten 1/0/8 141 S I WS-C2960G Gig 0/24
IT_CABINET3 Ten 1/0/8 121 S I WS-C2960G Gig 0/21
ITCAM-SW3 Ten 1/0/11 176 S I WS-C2960X Gig 1/0/25
Exch.Cabin Ten 1/0/7 160 S I WS-C2960G Gig 0/23

Total cdp entries displayed : 12

[paul driver]

Hello

---

@amjadkhan1920 wrote:

yes these are the same switches with same model this is just few switches and i connected my self before it was working on copper now i migrate to fiber and remove all the copper physically

---

Then clear cdp table and let cdp rediscover

clear cdp table

[Mark Malone]

yes check the cdp neighbor detail see if IPs are different . prob different switches as stated
You could trace the cables too , to be sure

[amjadkhan1920]

i checked the IP both switch have separate host name and ip address and psychically i cross checked there is no chance for loops but once you checked the cdp nei access it show correct path this is very string 

[Mark Malone]

clear cdp neighbours as Paul stated and then please post the show cdp neigh g1/0/3 detail and show cdp neigh g1/0/8 detail from the core side

[amjadkhan1920]

dear still same, i did many times but no luck ,

CORETWO#clear cdp table
CORETWO#sh cdp nei ten
CORETWO#sh cdp nei tenGigabitEthernet 1/0/3
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
IT_Cabinet2 Ten 1/0/3 167 S I WS-C2960G Gig 0/24

Total cdp entries displayed : 1
CORETWO#sh cdp nei tenGigabitEthernet 1/0/3 det
-------------------------
Device ID: IT_Cabinet2
Entry address(es):
IP address: 10.67.0.12
Platform: cisco WS-C2960G-24TC-L, Capabilities: Switch IGMP
Interface: TenGigabitEthernet1/0/3, Port ID (outgoing port): GigabitEthernet0/2 4
Holdtime : 164 sec

Version :
Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 12.2(50)SE5, REL EASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Tue 28-Sep-10 13:44 by prod_rel_team

advertisement version: 2
Protocol Hello: OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=0000000 0FFFFFFFF010221FF000000000000E8BA70782E80FF0000
VTP Management Domain: 'ALHOKAIR'
Native VLAN: 1
Duplex: full
Management address(es):
IP address: 10.67.0.12

Total cdp entries displayed : 1
CORETWO#sh cdp nei tenGigabitEthernet 1/0/8 det
-------------------------
Device ID: IT_Cabinet_3_2
Entry address(es):
IP address: 10.67.0.17
Platform: cisco WS-C2960S-24PS-L, Capabilities: Switch IGMP
Interface: TenGigabitEthernet1/0/8, Port ID (outgoing port): GigabitEthernet1/0 /27
Holdtime : 162 sec

Version :
Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(55)SE7, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2013 by Cisco Systems, Inc.
Compiled Mon 28-Jan-13 10:28 by prod_rel_team

advertisement version: 2
Protocol Hello: OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=0000000 0FFFFFFFF010221FF0000000000006C998969F800FF0000
VTP Management Domain: 'ALHOKAIR'
Native VLAN: 1
Duplex: full
Management address(es):
IP address: 10.67.0.17

-------------------------
Device ID: IT_Cabinet2
Entry address(es):
IP address: 10.67.0.12
Platform: cisco WS-C2960G-24TC-L, Capabilities: Switch IGMP
Interface: TenGigabitEthernet1/0/8, Port ID (outgoing port): GigabitEthernet0/2 4
Holdtime : 154 sec

Version :
Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 12.2(50)SE5, REL EASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Tue 28-Sep-10 13:44 by prod_rel_team

advertisement version: 2
Protocol Hello: OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=0000000 0FFFFFFFF010221FF000000000000E8BA70782E80FF0000
VTP Management Domain: 'ALHOKAIR'
Native VLAN: 1
Duplex: full
Management address(es):
IP address: 10.67.0.12

-------------------------
Device ID: IT_CABINET3
Entry address(es):
IP address: 10.67.0.13
Platform: cisco WS-C2960G-24TC-L, Capabilities: Switch IGMP
Interface: TenGigabitEthernet1/0/8, Port ID (outgoing port): GigabitEthernet0/2 1
Holdtime : 157 sec

Version :
Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 12.2(50)SE5, REL EASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Tue 28-Sep-10 13:44 by prod_rel_team

advertisement version: 2
Protocol Hello: OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=0000000 0FFFFFFFF010221FF00000000000024B657C67F80FF0000
VTP Management Domain: 'ALHOKAIR'
Native VLAN: 1
Duplex: full
Management address(es):
IP address: 10.67.0.13

Total cdp entries displayed : 3
CORETWO#sh cdp nei
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
IT-SW1 Ten 1/0/9 149 S I WS-C3560- Gig 0/3
3RD_simen Ten 1/0/4 154 S I WS-C2960S Gig 1/0/27
IT-SW2 Ten 1/0/10 150 S I WS-C3560- Gig 0/3
CORESWITCH Ten 1/0/1 169 R S I WS-C4507R Gig 5/1
IT_Cabinet_3_2 Ten 1/0/6 155 S I WS-C2960S Gig 1/0/27
IT_Cabinet_3_2 Ten 1/0/8 155 S I WS-C2960S Gig 1/0/27
IT_Cabinet1 Ten 1/0/5 154 S I WS-C2960G Gig 0/23
IT_Cabinet2 Ten 1/0/3 147 S I WS-C2960G Gig 0/24
IT_Cabinet2 Ten 1/0/8 147 S I WS-C2960G Gig 0/24
IT_CABINET3 Ten 1/0/8 150 S I WS-C2960G Gig 0/21
ITCAM-SW3 Ten 1/0/11 146 S I WS-C2960X Gig 1/0/25
Exch.Cabin Ten 1/0/7 157 S I WS-C2960G Gig 0/23

Total cdp entries displayed : 12
CORETWO#

[Deepak Kumar]

Hi,

Can you verify one more thing:

Ping an IP "10.67.0.12" from the core switch and check ARP for this IP and mac-address-table. This process repeats 2 to 3 times after 5 minutes. and share  STP details from the Core switch and that access switch also.

Regards,
Deepak Kumar