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Cisco config/trunking

Posted on 2017-10-12
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Last Modified: 2017-10-12
I have 4 switches in this issue, 2 core switches (3650 in stack) and then 2 2960-x each on different floors.  

First 2960 has a link to the core switches, and the second is trunked to first 2960.  I have each of the 2960 with a management IP assigned to vlan1.  Port config is as follows

2960-1   Port 1/0/48 trunked to 3650 stack port 2/0/48

2960 2  port 1/0/48 trunked to 2960 1 port 1/0/47

all ports in trunked mode with switchport trunk vlan allowed all  

I'm not sure if i need dot1q on the 2960's to work.  But i'm not able to access the management ip of either 2960.  Was hoping to have someone peek at the config and see if i'm missing something.  

The 3650 config for that interface :

interface GigabitEthernet2/0/48
 description Link to COB-ITCONF 2960
 switchport mode trunk
itconf2960.txt
meter2960.txt
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Question by:leadtheway
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Accepted Solution

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Svet Chinkov earned 3000 total points
Hi

I would start by making sure you have switchport trunk encapsulation dot1q on the 3650 switchport (gi2/0/48) that connects to the 2960 switch. Please let me know if that fixed the issue or not.

Thank you
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by:leadtheway
Dos it have to be enabled on trunk ports of all 3?
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Expert Comment

by:Svet Chinkov
The 2960 switches are layer 2, therefore you do not need to enter the command on them. You have to use the above mentioned command only when you are trunking layer 3 switches such as the 3650. I hope that clarifies things for you.

Also, if that is not the fix can you please paste the output of the following commands form all 3 switches:
1. show interface trunk
2. show interface status

Thank You
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Author Comment

by:leadtheway
doesn't appear to be a valid command on the 3650
COB-3650-CORE(config-if)#switchport trunk encap dot1q
                                          ^
% Invalid input detected at '^' marker.
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Author Comment

by:leadtheway
looks like it auto encaps

COB-3650-CORE#sh interface trunk

Port        Mode             Encapsulation  Status        Native vlan
Gi1/0/43    on               802.1q         trunking      1
Gi1/0/44    on               802.1q         trunking      1
Gi2/0/44    on               802.1q         trunking      1
Gi2/0/48    on               802.1q         trunking      1
Po10        on               802.1q         trunking      1
Po11        on               802.1q         trunking      1
Po12        on               802.1q         trunking      1
Po14        on               802.1q         trunking      1
Po15        on               802.1q         trunking      1
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Expert Comment

by:Svet Chinkov
I just realized  that the 3650 only supports 802.1q, therefore you do not have to specify the encapsulation type. Can you provide the output of the same command from the 2960-1 switch and also the below commands:

show ip int brief
show int status
show int switchport - please paste the output for the uplink ports only

Thank You
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LVL 2

Expert Comment

by:Svet Chinkov
I forgot to ask if you tried pinging any of the switches.

Thank You
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Author Comment

by:leadtheway
i have tried pinging, both from desk and from the 3650, cannot ping

the show interfaces trunk

COB_ITCONF#sh interface trunk      

Port        Mode             Encapsulation  Status        Native vlan
Gi1/0/47    on               802.1q         trunking      1
Gi1/0/48    on               802.1q         trunking      1

Port        Vlans allowed on trunk
Gi1/0/47    1-4094
Gi1/0/48    1-4094

Port        Vlans allowed and active in management domain
Gi1/0/47    1,10,19-20,30,40,50,100,200,203,255,750,999
Gi1/0/48    1,10,19-20,30,40,50,100,200,203,255,750,999

Port        Vlans in spanning tree forwarding state and not pruned
Gi1/0/47    1,10,19-20,30,40,50,100,200,203,255,750,999
Gi1/0/48    1,10,19-20,30,40,50,100,200,203,255,750,999



COB_ITCONF#sh ip int brief
Interface              IP-Address      OK? Method Status                Protocol
Vlan1                  10.2.100.20     YES NVRAM  up                    up      
FastEthernet0          unassigned      YES NVRAM  administratively down down    
GigabitEthernet1/0/1   unassigned      YES unset  down                  down    
GigabitEthernet1/0/2   unassigned      YES unset  down                  down    
GigabitEthernet1/0/3   unassigned      YES unset  down                  down    
GigabitEthernet1/0/4   unassigned      YES unset  down                  down    
GigabitEthernet1/0/5   unassigned      YES unset  down                  down    
GigabitEthernet1/0/6   unassigned      YES unset  down                  down    
GigabitEthernet1/0/7   unassigned      YES unset  down                  down    
GigabitEthernet1/0/8   unassigned      YES unset  down                  down    
GigabitEthernet1/0/9   unassigned      YES unset  down                  down    
GigabitEthernet1/0/10  unassigned      YES unset  down                  down    
GigabitEthernet1/0/11  unassigned      YES unset  down                  down    
GigabitEthernet1/0/12  unassigned      YES unset  down                  down    
GigabitEthernet1/0/13  unassigned      YES unset  down                  down    
GigabitEthernet1/0/14  unassigned      YES unset  down                  down    
GigabitEthernet1/0/15  unassigned      YES unset  down                  down    
GigabitEthernet1/0/16  unassigned      YES unset  down                  down    
GigabitEthernet1/0/17  unassigned      YES unset  down                  down    
GigabitEthernet1/0/18  unassigned      YES unset  down                  down    
GigabitEthernet1/0/19  unassigned      YES unset  down                  down    
GigabitEthernet1/0/20  unassigned      YES unset  down                  down    
GigabitEthernet1/0/21  unassigned      YES unset  down                  down    
GigabitEthernet1/0/22  unassigned      YES unset  down                  down    
GigabitEthernet1/0/23  unassigned      YES unset  down                  down    
GigabitEthernet1/0/24  unassigned      YES unset  down                  down    
GigabitEthernet1/0/25  unassigned      YES unset  down                  down    
GigabitEthernet1/0/26  unassigned      YES unset  down                  down    
GigabitEthernet1/0/27  unassigned      YES unset  down                  down    
GigabitEthernet1/0/28  unassigned      YES unset  down                  down    
GigabitEthernet1/0/29  unassigned      YES unset  down                  down    
GigabitEthernet1/0/30  unassigned      YES unset  down                  down    
GigabitEthernet1/0/31  unassigned      YES unset  down                  down    
GigabitEthernet1/0/32  unassigned      YES unset  down                  down    
GigabitEthernet1/0/33  unassigned      YES unset  down                  down    
GigabitEthernet1/0/34  unassigned      YES unset  down                  down    
GigabitEthernet1/0/35  unassigned      YES unset  down                  down    
GigabitEthernet1/0/36  unassigned      YES unset  down                  down    
GigabitEthernet1/0/37  unassigned      YES unset  down                  down    
GigabitEthernet1/0/38  unassigned      YES unset  down                  down    
GigabitEthernet1/0/39  unassigned      YES unset  down                  down    
GigabitEthernet1/0/40  unassigned      YES unset  down                  down    
GigabitEthernet1/0/41  unassigned      YES unset  down                  down    
GigabitEthernet1/0/42  unassigned      YES unset  down                  down    
GigabitEthernet1/0/43  unassigned      YES unset  down                  down    
GigabitEthernet1/0/44  unassigned      YES unset  down                  down    
GigabitEthernet1/0/45  unassigned      YES unset  down                  down    
GigabitEthernet1/0/46  unassigned      YES unset  down                  down    
GigabitEthernet1/0/47  unassigned      YES unset  up                    up      
GigabitEthernet1/0/48  unassigned      YES unset  up                    up      
GigabitEthernet1/0/49  unassigned      YES unset  down                  down    
GigabitEthernet1/0/50  unassigned      YES unset  down                  down    
Te1/0/1                unassigned      YES unset  down                  down    
Te1/0/2                unassigned      YES unset  down                  down    


Sh int status

Gi1/0/47                     connected    trunk      a-full a-1000 10/100/1000BaseTX
         
Port      Name               Status       Vlan       Duplex  Speed Type
Gi1/0/48                     connected    trunk      a-full a-1000 10/100/1000Ba






Name: Gi1/0/47
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none

Name: Gi1/0/48
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none
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Author Comment

by:leadtheway
i can ping from the 2960-1 to the other 2960
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Author Comment

by:leadtheway
ok i think i got the ping down, the issue is vlan 1, i created a vlan 100 for management and assigned ti IP there and i can ping now from the 3650 and vice versa, however i can't ping those switches from a different vlan ( my desk)
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Author Comment

by:leadtheway
nvm. i got it, needed to add gateway
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Author Closing Comment

by:leadtheway
fixed self, points awarded for effort
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