Subinterfaces error with two VLANs

[Bruno Giorgio]

Hi all,

I'm running Packet Tracer 8.2.1, and I have the following network. Two VLANs (VLAN4 and VLAN5), one Switch 2960, and one Router 1941. 

The VLAN networks are:

VLAN4 172.16.0.0/18   - PC IP 172.16.0.2  - Gateway 172.16.0.1

VLAN5 172.16.96.0/19 - PC IP 172.16.96.2 - Gateway 172.16.96.1

On the Switch, I have set as follows,

VLAN4 --> Fa0/x range 1 - 10  (the PC is connected to Fa0/1)

VLAN5 --> Fa0/x range 11-15  (the PC is connected to Fa0/11)

The Gig0/1 is the trunk connected to the Gig0/1 of the Router.

Now, on the Router I have set 2 subinterfaces with encapsulation dot1Q. No shutdown. 

Every time I try to ping one PC on VLAN4 to another PC on VLAN5, for example

ping 172.16.96.2

it failed and on the Router I have the following error message. 

"There is no subinterface with this vlan enabled"

Any idea about how to solve this?

Thanks in advance!

[balaji.bandi]

how is your sub interface config look like. make sure PC FW also disabled.

check below config need to be done for the sub-interface :

https://networklessons.com/cisco/ccna-routing-switching-icnd1-100-105/how-to-configure-router-on-a-stick

[Martin L]

Zip your lab PT file and attach it here

[M02@rt37 · Accepted solution]

Hello @Bruno Giorgio,

Please share subinterface config.

It should look like:

interface gig 0/1.10

encapsulation dot1q 4

ip address 172.16.0.1 mask

!

interface gig 0/1.20

encapsulation dot1q 5

ip address 172.16.96.1 mask

[Bruno Giorgio]

Hi  balaji.bandi ,

Thank you, I will read your link and let you know.

Hi Martin L ,

Sure. Attached you'll find my lab file. 

[Martin L · Accepted solution]

Encapsulation Vlan ID

is wrong for both

vlan 4 and 5

as interface ID does not matter but

encapsulation ID

does matter. Command

encapsulation dot1Q.x

will mark or assign all traffic to belong to

vlan x

Note that interface number does not have to match

encapsulation

number but makes sense when it does.

Change 10 to 4 and 20 to  5 like

interface GigabitEthernet0/1.4

encapsulation dot1Q 4


interface GigabitEthernet0/1.5 


encapsulation dot1Q 5

Regards, ML
**Please Rate All Helpful Responses **

[Bruno Giorgio]

You are great guys!

Thank you so much for your support!

[M02@rt37]

You're very welcome @Bruno Giorgio.