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CDP is showing the wrong information.

amjadkhan1920
Level 1
Level 1

‎03-21-2019 02:00 AM

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  

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23 Replies 23

amjadkhan1920
Level 1
Level 1
In response to Deepak Kumar

‎03-23-2019 11:18 PM

dear all,

 

hope you are doing well 

 

i did all the possibility but this is strange may be IOS have some issues? but once you check the access layer all the information is correct while core mismatch 

 

CORETWO#ping 10.67.0.12
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.67.0.12, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/10 ms
CORETWO#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.64.6.196 232 0012.daf6.b53f ARPA Vlan11
Internet 10.64.7.78 108 0012.daf6.b53f ARPA Vlan11
Internet 10.67.0.12 16 e8ba.7078.2ec1 ARPA Vlan11
Internet 10.67.0.254 - 706e.6d51.ecd4 ARPA Vlan11
CORETWO#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.64.6.196 234 0012.daf6.b53f ARPA Vlan11
Internet 10.64.7.78 110 0012.daf6.b53f ARPA Vlan11
Internet 10.67.0.12 19 e8ba.7078.2ec1 ARPA Vlan11
Internet 10.67.0.254 - 706e.6d51.ecd4 ARPA Vlan11
CORETWO#cle
CORETWO#clear arp
CORETWO#
CORETWO#ping 10.67.0.12
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.67.0.12, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/4/10 ms
CORETWO#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.64.6.196 0 0012.daf6.b53f ARPA Vlan11
Internet 10.64.7.78 0 0012.daf6.b53f ARPA Vlan11
Internet 10.67.0.12 0 e8ba.7078.2ec1 ARPA Vlan11
Internet 10.67.0.254 - 706e.6d51.ecd4 ARPA Vlan11
CORETWO#
 

0 Helpful

amjadkhan1920
Level 1
Level 1
In response to Deepak Kumar

‎03-23-2019 11:28 PM

dear deepak below is the stp result 

CORETWO#sh sp

VLAN0001
Spanning tree enabled protocol rstp
Root ID Priority 24577
Address 0012.daf6.b500
Cost 4
Port 1 (TenGigabitEthernet1/0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 706e.6d51.ec80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/0/1 Root FWD 4 128.1 P2p
Te1/0/2 Desg FWD 4 128.2 P2p
Te1/0/3 Desg FWD 4 128.3 P2p Peer(STP)
Te1/0/4 Desg FWD 4 128.4 P2p Peer(STP)
Te1/0/5 Desg FWD 4 128.5 P2p Peer(STP)
Te1/0/6 Desg FWD 4 128.6 P2p Peer(STP)
Te1/0/7 Desg FWD 4 128.7 P2p Peer(STP)
Te1/0/8 Desg FWD 4 128.8 P2p Peer(STP)
Te1/0/9 Desg FWD 4 128.9 P2p Peer(STP)
Te1/0/10 Desg FWD 4 128.10 P2p Peer(STP)
Te1/0/11 Desg FWD 4 128.11 P2p Peer(STP)

 

VLAN0002
Spanning tree enabled protocol rstp
Root ID Priority 24578
Address 0012.daf6.b500
Cost 4
Port 1 (TenGigabitEthernet1/0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32770 (priority 32768 sys-id-ext 2)
Address 706e.6d51.ec80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/0/1 Root FWD 4 128.1 P2p
Te1/0/2 Desg FWD 4 128.2 P2p
Te1/0/3 Desg FWD 4 128.3 P2p Peer(STP)
Te1/0/4 Desg FWD 4 128.4 P2p Peer(STP)
Te1/0/5 Desg FWD 4 128.5 P2p Peer(STP)
Te1/0/6 Desg FWD 4 128.6 P2p Peer(STP)
Te1/0/7 Desg FWD 4 128.7 P2p Peer(STP)
Te1/0/8 Desg FWD 4 128.8 P2p Peer(STP)
Te1/0/9 Desg FWD 4 128.9 P2p Peer(STP)
Te1/0/10 Desg FWD 4 128.10 P2p Peer(STP)
Te1/0/11 Desg FWD 4 128.11 P2p Peer(STP)

 

VLAN0003
Spanning tree enabled protocol rstp
Root ID Priority 24579
Address 0012.daf6.b500
Cost 4
Port 1 (TenGigabitEthernet1/0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32771 (priority 32768 sys-id-ext 3)
Address 706e.6d51.ec80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/0/1 Root FWD 4 128.1 P2p
Te1/0/2 Desg FWD 4 128.2 P2p
Te1/0/3 Desg FWD 4 128.3 P2p Peer(STP)
Te1/0/4 Desg FWD 4 128.4 P2p Peer(STP)
Te1/0/5 Desg FWD 4 128.5 P2p Peer(STP)
Te1/0/6 Desg FWD 4 128.6 P2p Peer(STP)
Te1/0/7 Desg FWD 4 128.7 P2p Peer(STP)
Te1/0/8 Desg FWD 4 128.8 P2p Peer(STP)
Te1/0/9 Desg FWD 4 128.9 P2p Peer(STP)
Te1/0/10 Desg FWD 4 128.10 P2p Peer(STP)
Te1/0/11 Desg FWD 4 128.11 P2p Peer(STP)

 

VLAN0011
Spanning tree enabled protocol rstp
Root ID Priority 20491
Address 706e.6d51.ec80
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 20491 (priority 20480 sys-id-ext 11)
Address 706e.6d51.ec80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/0/1 Desg FWD 4 128.1 P2p
Te1/0/2 Desg FWD 4 128.2 P2p
Te1/0/3 Desg FWD 4 128.3 P2p Peer(STP)
Te1/0/4 Desg FWD 4 128.4 P2p Peer(STP)
Te1/0/5 Desg FWD 4 128.5 P2p Peer(STP)
Te1/0/6 Desg FWD 4 128.6 P2p Peer(STP)
Te1/0/7 Desg FWD 4 128.7 P2p Peer(STP)
Te1/0/8 Desg FWD 4 128.8 P2p Peer(STP)
Te1/0/9 Desg FWD 4 128.9 P2p Peer(STP)
Te1/0/10 Desg FWD 4 128.10 P2p Peer(STP)
Te1/0/11 Desg FWD 4 128.11 P2p Peer(STP)

 

VLAN0051
Spanning tree enabled protocol rstp
Root ID Priority 32819
Address 0012.daf6.b500
Cost 4
Port 1 (TenGigabitEthernet1/0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32819 (priority 32768 sys-id-ext 51)
Address 706e.6d51.ec80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/0/1 Root FWD 4 128.1 P2p
Te1/0/2 Desg FWD 4 128.2 P2p
Te1/0/3 Desg FWD 4 128.3 P2p Peer(STP)
Te1/0/4 Desg FWD 4 128.4 P2p Peer(STP)
Te1/0/5 Desg FWD 4 128.5 P2p Peer(STP)
Te1/0/6 Desg FWD 4 128.6 P2p Peer(STP)
Te1/0/7 Desg FWD 4 128.7 P2p
Te1/0/8 Desg FWD 4 128.8 P2p Peer(STP)
Te1/0/9 Desg FWD 4 128.9 P2p
Te1/0/10 Desg FWD 4 128.10 P2p Peer(STP)
Te1/0/11 Desg FWD 4 128.11 P2p Peer(STP)

 

0 Helpful

amjadkhan1920
Level 1
Level 1
In response to Deepak Kumar

‎03-23-2019 11:28 PM

dear deepak below is the stp result 

CORETWO#sh sp

VLAN0001
Spanning tree enabled protocol rstp
Root ID Priority 24577
Address 0012.daf6.b500
Cost 4
Port 1 (TenGigabitEthernet1/0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 706e.6d51.ec80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/0/1 Root FWD 4 128.1 P2p
Te1/0/2 Desg FWD 4 128.2 P2p
Te1/0/3 Desg FWD 4 128.3 P2p Peer(STP)
Te1/0/4 Desg FWD 4 128.4 P2p Peer(STP)
Te1/0/5 Desg FWD 4 128.5 P2p Peer(STP)
Te1/0/6 Desg FWD 4 128.6 P2p Peer(STP)
Te1/0/7 Desg FWD 4 128.7 P2p Peer(STP)
Te1/0/8 Desg FWD 4 128.8 P2p Peer(STP)
Te1/0/9 Desg FWD 4 128.9 P2p Peer(STP)
Te1/0/10 Desg FWD 4 128.10 P2p Peer(STP)
Te1/0/11 Desg FWD 4 128.11 P2p Peer(STP)

 

VLAN0002
Spanning tree enabled protocol rstp
Root ID Priority 24578
Address 0012.daf6.b500
Cost 4
Port 1 (TenGigabitEthernet1/0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32770 (priority 32768 sys-id-ext 2)
Address 706e.6d51.ec80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/0/1 Root FWD 4 128.1 P2p
Te1/0/2 Desg FWD 4 128.2 P2p
Te1/0/3 Desg FWD 4 128.3 P2p Peer(STP)
Te1/0/4 Desg FWD 4 128.4 P2p Peer(STP)
Te1/0/5 Desg FWD 4 128.5 P2p Peer(STP)
Te1/0/6 Desg FWD 4 128.6 P2p Peer(STP)
Te1/0/7 Desg FWD 4 128.7 P2p Peer(STP)
Te1/0/8 Desg FWD 4 128.8 P2p Peer(STP)
Te1/0/9 Desg FWD 4 128.9 P2p Peer(STP)
Te1/0/10 Desg FWD 4 128.10 P2p Peer(STP)
Te1/0/11 Desg FWD 4 128.11 P2p Peer(STP)

 

VLAN0003
Spanning tree enabled protocol rstp
Root ID Priority 24579
Address 0012.daf6.b500
Cost 4
Port 1 (TenGigabitEthernet1/0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32771 (priority 32768 sys-id-ext 3)
Address 706e.6d51.ec80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/0/1 Root FWD 4 128.1 P2p
Te1/0/2 Desg FWD 4 128.2 P2p
Te1/0/3 Desg FWD 4 128.3 P2p Peer(STP)
Te1/0/4 Desg FWD 4 128.4 P2p Peer(STP)
Te1/0/5 Desg FWD 4 128.5 P2p Peer(STP)
Te1/0/6 Desg FWD 4 128.6 P2p Peer(STP)
Te1/0/7 Desg FWD 4 128.7 P2p Peer(STP)
Te1/0/8 Desg FWD 4 128.8 P2p Peer(STP)
Te1/0/9 Desg FWD 4 128.9 P2p Peer(STP)
Te1/0/10 Desg FWD 4 128.10 P2p Peer(STP)
Te1/0/11 Desg FWD 4 128.11 P2p Peer(STP)

 

VLAN0011
Spanning tree enabled protocol rstp
Root ID Priority 20491
Address 706e.6d51.ec80
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 20491 (priority 20480 sys-id-ext 11)
Address 706e.6d51.ec80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/0/1 Desg FWD 4 128.1 P2p
Te1/0/2 Desg FWD 4 128.2 P2p
Te1/0/3 Desg FWD 4 128.3 P2p Peer(STP)
Te1/0/4 Desg FWD 4 128.4 P2p Peer(STP)
Te1/0/5 Desg FWD 4 128.5 P2p Peer(STP)
Te1/0/6 Desg FWD 4 128.6 P2p Peer(STP)
Te1/0/7 Desg FWD 4 128.7 P2p Peer(STP)
Te1/0/8 Desg FWD 4 128.8 P2p Peer(STP)
Te1/0/9 Desg FWD 4 128.9 P2p Peer(STP)
Te1/0/10 Desg FWD 4 128.10 P2p Peer(STP)
Te1/0/11 Desg FWD 4 128.11 P2p Peer(STP)

 

VLAN0051
Spanning tree enabled protocol rstp
Root ID Priority 32819
Address 0012.daf6.b500
Cost 4
Port 1 (TenGigabitEthernet1/0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32819 (priority 32768 sys-id-ext 51)
Address 706e.6d51.ec80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/0/1 Root FWD 4 128.1 P2p
Te1/0/2 Desg FWD 4 128.2 P2p
Te1/0/3 Desg FWD 4 128.3 P2p Peer(STP)
Te1/0/4 Desg FWD 4 128.4 P2p Peer(STP)
Te1/0/5 Desg FWD 4 128.5 P2p Peer(STP)
Te1/0/6 Desg FWD 4 128.6 P2p Peer(STP)
Te1/0/7 Desg FWD 4 128.7 P2p
Te1/0/8 Desg FWD 4 128.8 P2p Peer(STP)
Te1/0/9 Desg FWD 4 128.9 P2p
Te1/0/10 Desg FWD 4 128.10 P2p Peer(STP)
Te1/0/11 Desg FWD 4 128.11 P2p Peer(STP)

 

0 Helpful

paul driver
VIP
VIP
In response to amjadkhan1920

‎03-23-2019 03:22 AM

Hello
What is connected to this port?
IT_Cabinet_3_2 Ten 1/0/8 155 S I WS-C2960S Gig 1/0/27
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


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul
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amjadkhan1920
Level 1
Level 1
In response to paul driver

‎03-23-2019 11:20 PM

dear paul ,

 

physically my self i pull new fiber cable 3 times i cross check my self  this is very strange and first time i am facing such a issue may be IOS have some bugs ?

0 Helpful

amjadkhan1920
Level 1
Level 1
In response to paul driver

‎03-23-2019 11:23 PM

dear paul,

 

physically ten1/0/8 is connected to IT_CABINET3 below is the details of access layer

 

IT_CABINET3#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
CORETWO Gig 0/21 130 S I WS-C3850- Ten 1/0/8
IT_CABINET3#

0 Helpful

amjadkhan1920
Level 1
Level 1
In response to paul driver

‎03-23-2019 11:23 PM

dear paul,

 

physically ten1/0/8 is connected to IT_CABINET3 below is the details of access layer

 

IT_CABINET3#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
CORETWO Gig 0/21 130 S I WS-C3850- Ten 1/0/8
IT_CABINET3#

0 Helpful

Larry Sullivan
Level 3
Level 3
In response to amjadkhan1920

‎03-23-2019 05:21 PM

Strange indeed.  1/0/3 and 1/0/8 on the Core switch have the same MAC address coming in?

0 Helpful

amjadkhan1920
Level 1
Level 1
In response to Larry Sullivan

‎03-23-2019 11:26 PM

dear this is very strange and first time i am facing this issue i know only possible when hub or bridge is  live with in infrastructure but here nothing i 3 time cross check the physical connectivity my self there is no loops no stp nothing 

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