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Unable to ping or Telnet switch 3560 but showing in cdp neighbour

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Shahzad Ayub
Level 1
Level 1

‎08-30-2015 12:06 PM - edited ‎03-08-2019 01:34 AM

Hi,

 

I am unable to ping/telnet to one of our cisco switches model 3560, switch is working fine except I cannot access it.It's also showing as neighbor in show cdp neighbor command from neighbor switch.

show arp is not showing the entry for switch IP, when I start pinging it, it only shows incomplete entry in arp table.

 

configuration on both switches is very simple, ports are just configured as trunk

 

#switchport mode trunk

#switchport nonegotiate

I attached some output commands from neighbor switch: connected on Gi1/0/48

 


CISCO3850#sh int  trunk
 

Port        Mode             Encapsulation  Status        Native vlan
Gi1/0/3     on               802.1q         trunking      10
Gi1/0/4     on               802.1q         trunking      10
Gi1/0/5     on               802.1q         trunking      10
Gi1/0/6     on               802.1q         trunking      10
Gi1/0/48    on               802.1q         trunking      1
 
Port        Vlans allowed and active in management domain
Gi1/0/3     1,5,7,10-12,14-15
Gi1/0/4     1,5,7,10-12,14-15
Gi1/0/5     1,5,7,10-12,14-15
Gi1/0/6     1,5,7,10-12,14-15
Gi1/0/48    1,5,7,10-12,14-15
 
Port        Vlans in spanning tree forwarding state and not pruned
Gi1/0/3     1,5,7,10-12,14-15
Gi1/0/4     1,5,7,10-12,14-15
Gi1/0/5     1,5,7,10-12,14-15
Gi1/0/6     1,5,7,10-12,14-15
Gi1/0/48    1,5,7,10-12,14-15
 

CISCO3850#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
AMC-RYD-RTR.local.aldaramed.com
                                   Gig 1/0/47        160             R S I  CISCO2921 Gig 0/1
CISCO3560X                         Gig 1/0/48        134              S I   WS-C3560X Gig 0/48
SEP0c2724bba5f7                    Gig 1/0/43        138             H P M  IP Phone  Port 1
AldaraAP2                          Gig 1/0/4         175               T    AIR-AP114 Gig 0.1
AldaraAP3                          Gig 1/0/5         156               T    AIR-AP114 Gig 0.1
AldaraAP1                          Gig 1/0/3         148               T    AIR-AP114 Gig 0.1
AldaraAP4                          Gig 1/0/6         171               T    AIR-AP114 Gig 0.1
SEP0004f2f795ef                    Gig 1/0/38        168              H P   IP Phone  port 1
 
 
 
CISCO3850#show cdp nei det
-------------------------
Device ID: AMC-RYD-RTR.local.aldaramed.com
Entry address(es):
  IP address: 10.10.10.1
Platform: Cisco CISCO2921/K9,  Capabilities: Router Switch IGMP
Interface: GigabitEthernet1/0/47,  Port ID (outgoing port): GigabitEthernet0/1
Holdtime : 152 sec
 
Version :
Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.2(4)M3, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2013 by Cisco Systems, Inc.
Compiled Tue 26-Feb-13 03:42 by prod_rel_team
 

advertisement version: 2
VTP Management Domain: ''
Duplex: full
 
-------------------------
Device ID: CISCO3560X
Entry address(es):
  IP address: 10.100.25.3
Platform: cisco WS-C3560X-48P,  Capabilities: Switch IGMP
Interface: GigabitEthernet1/0/48,  Port ID (outgoing port): GigabitEthernet0/48
Holdtime : 127 sec
 
Version :
Cisco IOS Software, C3560E Software (C3560E-UNIVERSALK9-M), Version 12.2(55)SE5, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2012 by Cisco Systems, Inc.
Compiled Thu 09-Feb-12 18:32 by prod_rel_team
 

advertisement version: 2
Protocol Hello:  OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=00000000FFFFFFFF010221FF0000000000006C416A81F700FF0000
VTP Management Domain: ''
Native VLAN: 1
Duplex: full
Management address(es):
  IP address: 10.100.25.3
 

CISCO3850#sh arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  10.10.10.1            178   e02f.6d38.5371  ARPA   GigabitEthernet1/0/47
Internet  10.10.10.2            168   e02f.6d38.5371  ARPA   GigabitEthernet1/0/47
Internet  10.10.10.5              -   a055.4fc6.af55  ARPA   GigabitEthernet1/0/47
Internet  10.100.0.1              -   a055.4fc6.af47  ARPA   Vlan5
Internet  10.100.0.10             0   00e0.db0e.d556  ARPA   Vlan5
Internet  10.100.0.32             0   9cb6.5418.3246  ARPA   Vlan5
Internet  10.100.0.33            43   6451.0621.85f4  ARPA   Vlan5
Internet  10.100.0.52             0   90b1.1c90.3817  ARPA   Vlan5
Internet  10.100.0.53             0   f01f.af3c.a989  ARPA   Vlan5
Internet  10.100.0.54             0   a44e.3131.7190  ARPA   Vlan5
Internet  10.100.0.55            86   d0a6.3715.dcc3  ARPA   Vlan5
Internet  10.100.0.56             0   60fa.cd70.2a1c  ARPA   Vlan5
Internet  10.100.0.57            41   2c44.fd0a.9339  ARPA   Vlan5
Internet  10.100.0.58             1   1c99.4cbe.d6a9  ARPA   Vlan5
Internet  10.100.0.59             2   90b1.1c9c.cdf8  ARPA   Vlan5
Internet  10.100.0.60             0   a44e.3136.46b8  ARPA   Vlan5
Internet  10.100.0.61            31   f025.b7b5.68b7  ARPA   Vlan5
Internet  10.100.0.62             7   a44e.3136.57f0  ARPA   Vlan5
Internet  10.100.0.64             0   accf.5cc7.66af  ARPA   Vlan5
Internet  10.100.0.65             5   1c7b.2126.8d78  ARPA   Vlan5
Internet  10.100.0.67             1   f01f.af3c.b38e  ARPA   Vlan5
Internet  10.100.0.68            82   181e.b09c.ca30  ARPA   Vlan5
Internet  10.100.0.69            58   10a5.d0c4.8212  ARPA   Vlan5
Internet  10.100.0.70             0   0017.fc21.f0e6  ARPA   Vlan5
Internet  10.100.0.71             0   0017.fc1a.4ed8  ARPA   Vlan5
Internet  10.100.0.72             0   3c15.c230.b4ad  ARPA   Vlan5
Internet  10.100.0.73             0   0023.6333.cff8  ARPA   Vlan5
Internet  10.100.0.74             1   acb5.7d3e.e7b9  ARPA   Vlan5
Internet  10.100.0.75           106   5c0a.5ba0.8664  ARPA   Vlan5
Internet  10.100.0.77            54   08ee.8b81.66ad  ARPA   Vlan5
Internet  10.100.0.79           166   a44e.313a.9e88  ARPA   Vlan5
Internet  10.100.0.82             1   90b1.1c97.54e2  ARPA   Vlan5
Internet  10.100.0.83             1   b010.415f.e3cb  ARPA   Vlan5
Internet  10.100.0.86             0   f01f.af3d.0f7b  ARPA   Vlan5
Internet  10.100.0.88           226   e432.cbc8.8a3c  ARPA   Vlan5
Internet  10.100.0.90             4   8019.34e3.1d36  ARPA   Vlan5
Internet  10.100.0.91            85   a44e.313a.18f0  ARPA   Vlan5
Internet  10.100.0.92            41   f01f.af3d.00e7  ARPA   Vlan5
Internet  10.100.0.98             0   28e1.4ccc.ce68  ARPA   Vlan5
Internet  10.100.0.99           175   90b1.1c97.549b  ARPA   Vlan5
Internet  10.100.0.101          244   8438.3844.6ffb  ARPA   Vlan5
Internet  10.100.0.103            0   ec1f.724a.e550  ARPA   Vlan5
Internet  10.100.0.105            0   d0bf.9c84.323e  ARPA   Vlan5
Internet  10.100.0.109          197   3402.8660.9f14  ARPA   Vlan5
Internet  10.100.0.110            2   3402.8660.9ea6  ARPA   Vlan5
Internet  10.100.0.112           75   34e6.d75c.a96c  ARPA   Vlan5
Internet  10.100.0.115           41   a44e.3136.915c  ARPA   Vlan5
Internet  10.100.0.121           85   a4e4.b805.14d7  ARPA   Vlan5
Internet  10.100.0.122            0   843a.4bd0.108c  ARPA   Vlan5
Internet  10.100.0.123           81   703e.acac.34a6  ARPA   Vlan5
Internet  10.100.0.130           81   a099.9b75.3080  ARPA   Vlan5
Internet  10.100.0.131            7   c033.5e15.9053  ARPA   Vlan5
Internet  10.100.0.132           89   2818.78fe.9184  ARPA   Vlan5
Internet  10.100.0.135          201   2008.edff.206b  ARPA   Vlan5
Internet  10.100.0.136            0   5cc5.d403.28e3  ARPA   Vlan5
Internet  10.100.0.137           81   848e.0c6c.fcce  ARPA   Vlan5
Internet  10.100.4.1              -   a055.4fc6.af54  ARPA   Vlan11
Internet  10.100.4.4              0   b083.fec2.711e  ARPA   Vlan11
Internet  10.100.4.5              0   b083.febe.f16b  ARPA   Vlan11
Internet  10.100.5.1              -   a055.4fc6.af67  ARPA   Vlan12
Internet  10.100.5.5             15   00d0.b80f.3721  ARPA   Vlan12
Internet  10.100.8.1              -   a055.4fc6.af46  ARPA   Vlan14
Internet  10.100.8.13             0   4874.6e97.9c90  ARPA   Vlan14
Internet  10.100.8.14            69   5cc5.d403.28e3  ARPA   Vlan14
Internet  10.100.8.16           190   5c0a.5ba0.8664  ARPA   Vlan14
Internet  10.100.12.1             -   a055.4fc6.af67  ARPA   Vlan7
Internet  10.100.16.1             -   a055.4fc6.af54  ARPA   Vlan15
Internet  10.100.16.11            1   0004.f2f7.95ef  ARPA   Vlan15
Internet  10.100.16.12           37   5ca4.8a64.a3ec  ARPA   Vlan15
Internet  10.100.16.13           36   0c27.24bb.a5f7  ARPA   Vlan15
Internet  10.100.16.14           38   0c27.24bb.a597  ARPA   Vlan15
Internet  10.100.16.15           37   ece1.a984.1880  ARPA   Vlan15
Internet  10.100.16.16           20   0c27.24bb.a342  ARPA   Vlan15
Internet  10.100.16.17          197   0c27.24bb.a5de  ARPA   Vlan15
Internet  10.100.16.18           37   5ca4.8a64.9d91  ARPA   Vlan15
Internet  10.100.16.19           37   0c27.24bb.a587  ARPA   Vlan15
Internet  10.100.16.20           33   6886.a7c4.5103  ARPA   Vlan15
Internet  10.100.16.21            9   0004.f2f7.98f5  ARPA   Vlan15
Internet  10.100.16.22            4   0004.f2f7.97e0  ARPA   Vlan15
Internet  10.100.16.23           37   0c68.03c1.4e60  ARPA   Vlan15
Internet  10.100.16.24           37   ece1.a984.0825  ARPA   Vlan15
Internet  10.100.16.25           37   ece1.a984.0efb  ARPA   Vlan15
Internet  10.100.16.26           37   5ca4.8a64.997d  ARPA   Vlan15
Internet  10.100.16.27           37   0c27.24bb.a4c9  ARPA   Vlan15
Internet  10.100.16.28           26   0c27.24bb.a5e2  ARPA   Vlan15
Internet  10.100.16.29           37   0c27.24bb.7613  ARPA   Vlan15
Internet  10.100.16.30           36   20bb.c0dd.4eaf  ARPA   Vlan15
Internet  10.100.16.31           37   ece1.a984.0f27  ARPA   Vlan15
Internet  10.100.16.32           37   0c68.03c1.fedb  ARPA   Vlan15
Internet  10.100.16.33           37   ece1.a984.645b  ARPA   Vlan15
Internet  10.100.16.35           43   6886.a7c4.54c5  ARPA   Vlan15
Internet  10.100.25.1             -   a055.4fc6.af46  ARPA   Vlan10
Internet  10.100.25.2             0   Incomplete      ARPA 
Internet  10.100.25.5           242   4403.a701.1cc6  ARPA   Vlan10
Internet  10.100.25.6           243   e02f.6dfb.40bb  ARPA   Vlan10
Internet  10.100.25.7             3   4c4e.3557.a3b7  ARPA   Vlan10
Internet  10.100.25.8             2   e02f.6dc4.aa4b  ARPA   Vlan10
2 people had this problem
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omer shtivi
Level 1
Level 1
In response to Shahzad Ayub

‎08-31-2015 04:52 AM

it's look like you got some kind of configuration problem there, you will have to get console access to solve it.

View solution in original post

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omer shtivi
Level 1
Level 1

‎08-30-2015 11:44 PM

Hi Shazad,

Can you please share with us more information?

show ip route 10.100.25.3

show mac-address table int gi 1/0/48

 

Thanks,

Omer Shtivi

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Shahzad Ayub
Level 1
Level 1
In response to omer shtivi

‎08-31-2015 12:23 AM

Hi Omer,

 

show mac command is not running on cisco 3850

10.100.25.2 is mgmt ip of problematic switch, 10.100.25.3 is mgmt ip of router.

CISCO3850#sh ip route 10.100.25.2
Routing entry for 10.100.25.0/24
  Known via "connected", distance 0, metric 0 (connected, via interface)
  Routing Descriptor Blocks:
  * directly connected, via Vlan10
      Route metric is 0, traffic share count is 1


CISCO3850#sh ip route 10.100.25.3
Routing entry for 10.100.25.3/32
  Known via "static", distance 1, metric 0
  Routing Descriptor Blocks:
  * 10.10.10.1
      Route metric is 0, traffic share count is 1

 

Thanks

Shahzad
 

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Shahzad Ayub
Level 1
Level 1
In response to Shahzad Ayub

‎08-31-2015 12:52 AM

If you see two different command's output below; in first Gi1/0/48 is showing in native vlan 1 whereas in 2nd output its showing "directly connected, via Vlan10"

 

CISCO3850#sh int trun
 
Port        Mode             Encapsulation  Status        Native vlan
Gi1/0/3     on               802.1q         trunking      10
Gi1/0/4     on               802.1q         trunking      10
Gi1/0/5     on               802.1q         trunking      10
Gi1/0/6     on               802.1q         trunking      10
Gi1/0/48    on               802.1q         trunking      1
 
Port        Vlans allowed on trunk
Gi1/0/3     1-4094
Gi1/0/4     1-4094
Gi1/0/5     1-4094
Gi1/0/6     1-4094
Gi1/0/48    1-4094
 
Port        Vlans allowed and active in management domain
Gi1/0/3     1,5,7,10-12,14-15
Gi1/0/4     1,5,7,10-12,14-15
Gi1/0/5     1,5,7,10-12,14-15
Gi1/0/6     1,5,7,10-12,14-15
Gi1/0/48    1,5,7,10-12,14-15
 
Port        Vlans in spanning tree forwarding state and not pruned
 
CISCO3850#sh ip route 10.100.25.2
Routing entry for 10.100.25.0/24
  Known via "connected", distance 0, metric 0 (connected, via interface)
  Routing Descriptor Blocks:
  * directly connected, via Vlan10
      Route metric is 0, traffic share count is 1
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omer shtivi
Level 1
Level 1
In response to Shahzad Ayub

‎08-31-2015 01:22 AM

can you send show mac-address table int gi1/0/48?

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Shahzad Ayub
Level 1
Level 1
In response to omer shtivi

‎08-31-2015 01:44 AM

Please find the output below;

 

CISCO3850#show mac address-table interface gigabitEthernet 1/0/48
          Mac Address Table
-------------------------------------------
 
Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
   1    6c41.6a81.f730    DYNAMIC     Gi1/0/48
   5    00e0.db0e.d556    DYNAMIC     Gi1/0/48
   5    34e6.d75c.a96c    DYNAMIC     Gi1/0/48
   5    3c07.5416.b790    DYNAMIC     Gi1/0/48
   5    6451.0621.85f4    DYNAMIC     Gi1/0/48
   5    90b1.1c90.3817    DYNAMIC     Gi1/0/48
   5    90b1.1c97.54e2    DYNAMIC     Gi1/0/48
   5    90b1.1c9c.cdf8    DYNAMIC     Gi1/0/48
   5    d0bf.9c84.323e    DYNAMIC     Gi1/0/48
   5    f01f.af3c.b38e    DYNAMIC     Gi1/0/48
   5    f01f.af3d.0f7b    DYNAMIC     Gi1/0/48
  15    0004.f2f7.439c    DYNAMIC     Gi1/0/48
  15    0004.f2f7.97e0    DYNAMIC     Gi1/0/48
  15    0004.f2f7.98f5    DYNAMIC     Gi1/0/48
  15    0c27.24bb.7613    DYNAMIC     Gi1/0/48
  15    0c27.24bb.a342    DYNAMIC     Gi1/0/48
  15    0c27.24bb.a4c9    DYNAMIC     Gi1/0/48
  15    0c27.24bb.a587    DYNAMIC     Gi1/0/48
  15    0c27.24bb.a597    DYNAMIC     Gi1/0/48
  15    0c27.24bb.a5de    DYNAMIC     Gi1/0/48
  15    0c27.24bb.a5e2    DYNAMIC     Gi1/0/48
  15    0c68.03c1.4e60    DYNAMIC     Gi1/0/48
  15    0c68.03c1.fedb    DYNAMIC     Gi1/0/48
  15    20bb.c0dd.4eaf    DYNAMIC     Gi1/0/48
  15    5ca4.8a64.997d    DYNAMIC     Gi1/0/48
  15    5ca4.8a64.9d91    DYNAMIC     Gi1/0/48
  15    5ca4.8a64.a3ec    DYNAMIC     Gi1/0/48
  15    ece1.a984.0825    DYNAMIC     Gi1/0/48
  15    ece1.a984.0efb    DYNAMIC     Gi1/0/48
  15    ece1.a984.0f27    DYNAMIC     Gi1/0/48
  15    ece1.a984.1880    DYNAMIC     Gi1/0/48
  15    ece1.a984.645b    DYNAMIC     Gi1/0/48
Total Mac Addresses for this criterion: 32
 
Thanks
Shahzad
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omer shtivi
Level 1
Level 1
In response to Shahzad Ayub

‎08-31-2015 04:35 AM

Two things,

First you keep looking for 10.100.25.2 and pinging it while at the CDP neighbor the switch claims it's at address 10.100.25.3:

"Management address(es):
  IP address: 10.100.25.3 "

 

Second it's seems like vlan 10 is not on the trunk on the other side, you don't learn any mac addresses on this vlan on interface gi1/0/48.

 

The most common reason is that the vlan doesn't exsist on the other switch. Someone configured interface vlan 10, but didn't added the command vlan 10

Best regards,

Omer Shtivi

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Shahzad Ayub
Level 1
Level 1
In response to omer shtivi

‎08-31-2015 04:47 AM

Let me explain you my connectivity:

Router -------- Switch A--------Trunk Link-----------Switch B(Problematic)

 

Mgmt IP Addresses:

Router 10.100.25.3

Switch A: 10.100.25.1

Switch B:10.100.25.2

Switch A learns mac-address via vlan 1 as its considereing interface in vlan 1.

configuration of Switch B(Problematic):

interface GigabitEthernet0/48

 switchport trunk encapsulation dot1q

 switchport mode trunk

 switchport nonegotiate

interface Vlan10

 ip address 10.100.25.2 255.255.255.0

 

configuration on Switch A:

interface Vlan10

 ip address 10.100.25.1 255.255.255.0

 ip helper-address 10.100.4.4

 

interface GigabitEthernet1/0/48

 switchport mode trunk

 switchport nonegotiate

 

 

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omer shtivi
Level 1
Level 1
In response to Shahzad Ayub

‎08-31-2015 04:48 AM

Please add the "show vlan" on switch B

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Shahzad Ayub
Level 1
Level 1
In response to omer shtivi

‎08-31-2015 04:50 AM

I don't have access to switch B.

 

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Go to solution
omer shtivi
Level 1
Level 1
In response to Shahzad Ayub

‎08-31-2015 04:52 AM

it's look like you got some kind of configuration problem there, you will have to get console access to solve it.

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Shahzad Ayub
Level 1
Level 1
In response to omer shtivi

‎08-31-2015 07:05 AM

when I run command "sh cdp nei" I can see neighbor connected but when I run "sh cdp nei detail" I don't see neighbor detail there.

 

 

Shahzad

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omer shtivi
Level 1
Level 1
In response to Shahzad Ayub

‎08-31-2015 08:14 AM

From your show cdp neighbor detail output:

Device ID: CISCO3560X
Entry address(es):
  IP address: 10.100.25.3
Platform: cisco WS-C3560X-48P,  Capabilities: Switch IGMP
Interface: GigabitEthernet1/0/48,  Port ID (outgoing port): GigabitEthernet0/48
Holdtime : 127 sec

 
Version :
Cisco IOS Software, C3560E Software (C3560E-UNIVERSALK9-M), Version 12.2(55)SE5, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2012 by Cisco Systems, Inc.
Compiled Thu 09-Feb-12 18:32 by prod_rel_team
 

advertisement version: 2
Protocol Hello:  OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=00000000FFFFFFFF010221FF0000000000006C416A81F700FF0000
VTP Management Domain: ''
Native VLAN: 1
Duplex: full
Management address(es):
  IP address: 10.100.25.3
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Shahzad Ayub
Level 1
Level 1
In response to omer shtivi

‎09-03-2015 01:03 AM

I checked through console, 10.100.25.3 was assigned to vlan10 on switch B, which is mgmt. IP of router. I can't believe how it was happened.

 

 

Shahzad

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