Helping with Dot1q termination on sub interface

Hello,
We're working on your problem. Please be patient.

Hi friend!
You can change the native vlan 60 untag to native vlan 131 untag and it will work.
Hope to help you!

The configuration could look as follows:

interface FastEthernet0/10

switchport trunk encapsulation dot1q ! Necessary only on 3550 and higher Catalysts

switchport trunk native vlan 100 ! Here I assume that the mgmt VLAN is 100

switchport mode trunk

Few switches do not support user settable encapsulation and come with default encap.

you can verify this by below command

#sh interfaces Fa1/0/1 capabilities | inc encap
  Trunk encap. type:     802.1Q

If 802.1q is already there then you can type rest of the commands suggested by peter.

Regards

Best regards,

Procedure
Configure SwitchA.
# Create a VLAN.

<HUAWEI> system-view
[HUAWEI] sysname SwitchA
[SwitchA] vlan batch 30
# Add an interface to the VLAN.

[SwitchA] interface gigabitethernet 0/0/2
[SwitchA-GigabitEthernet0/0/2] port link-type trunk
[SwitchA-GigabitEthernet0/0/2] port trunk allow-pass vlan 30
[SwitchA-GigabitEthernet0/0/2] quit
# Assign an IP address to a VLANIF interface.

[SwitchA] interface vlanif 30
[SwitchA-Vlanif30] ip address 10.10.30.1 24
[SwitchA-Vlanif30] quit
# Create and configure GE0/0/1.1.

[SwitchA] vcmp role silent
[SwitchA] interface gigabitethernet0/0/1
[SwitchA-GigabitEthernet0/0/1] port link-type hybrid
[SwitchA-GigabitEthernet0/0/1] quit
[SwitchA] interface gigabitethernet 0/0/1.1
[SwitchA-GigabitEthernet0/0/1.1] dot1q termination vid 10
[SwitchA-GigabitEthernet0/0/1.1] ip address 10.10.10.1 24
[SwitchA-GigabitEthernet0/0/1.1] arp broadcast enable
[SwitchA-GigabitEthernet0/0/1.1] quit
# Configure basic OSPF functions.

[SwitchA] router id 1.1.1.1
[SwitchA] ospf
[SwitchA-ospf-1] area 0
[SwitchA-ospf-1-area-0.0.0.0] network 10.10.10.0 0.0.0.255
[SwitchA-ospf-1-area-0.0.0.0] network 10.10.30.0 0.0.0.255
[SwitchA-ospf-1-area-0.0.0.0] return
Configure SwitchB.
# Create a VLAN.

<HUAWEI> system-view
[HUAWEI] sysname SwitchB
[SwitchB] vlan batch 30
# Add an interface to the VLAN.

[SwitchB] interface gigabitethernet 0/0/1
[SwitchB-GigabitEthernet0/0/1] port link-type trunk
[SwitchB-GigabitEthernet0/0/1] port trunk allow-pass vlan 30
[SwitchB-GigabitEthernet0/0/1] quit
# Assign an IP address to a VLANIF interface.

[SwitchB] interface vlanif 30
[SwitchB-Vlanif30] ip address 10.10.30.2 24
[SwitchB-Vlanif30] quit
# Create and configure GE0/0/2.1.

[SwitchB] vcmp role silent
[SwitchB] interface gigabitethernet0/0/2
[SwitchB-GigabitEthernet0/0/2] port link-type hybrid
[SwitchB-GigabitEthernet0/0/2] quit
[SwitchB] interface gigabitethernet 0/0/2.1
[SwitchB-GigabitEthernet0/0/2.1] dot1q termination vid 20
[SwitchB-GigabitEthernet0/0/2.1] ip address 10.10.20.1 24
[SwitchB-GigabitEthernet0/0/2.1] arp broadcast enable
[SwitchB-GigabitEthernet0/0/2.1] quit
# Configure basic OSPF functions.

[SwitchB] router id 2.2.2.2
[SwitchB] ospf
[SwitchB-ospf-1] area 0
[SwitchB-ospf-1-area-0.0.0.0] network 10.10.20.0 0.0.0.255
[SwitchB-ospf-1-area-0.0.0.0] network 10.10.30.0 0.0.0.255
[SwitchB-ospf-1-area-0.0.0.0] return
Verify the configuration.
On the PCs residing on the Layer 2 network connected to SwitchA, set the default gateway address to 10.10.10.1/24, which is the IP address of GE0/0/1.1. The switch connected to SwitchA allows VLAN 10.

On the PCs residing on the Layer 2 network connected to SwitchB, set the default gateway address to 10.10.20.1/24, which is the IP address of GE0/0/2.1. The switch connected to SwitchA allows VLAN 20.

After the configuration is complete, PCs on the two Layer 2 networks are isolated at Layer 2 and interwork at Layer 3.

Configuration Files
SwitchA configuration file

#
sysname SwitchA
#
router id 1.1.1.1
#
vcmp role silent
#
vlan batch 30
#
interface Vlanif30
ip address 10.10.30.1 255.255.255.0
#
interface GigabitEthernet0/0/1
port link-type hybrid
#
interface GigabitEthernet0/0/1.1
dot1q termination vid 10
ip address 10.10.10.1 255.255.255.0
arp broadcast enable
#
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 30
#
ospf 1
area 0.0.0.0
network 10.10.10.0 0.0.0.255
network 10.10.30.0 0.0.0.255
#
return
SwitchB configuration file

#
sysname SwitchB
#
router id 2.2.2.2
#
vcmp role silent
#
vlan batch 30
#
interface Vlanif30
ip address 10.10.30.2 255.255.255.0
#
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 30
#
interface GigabitEthernet0/0/2
port link-type hybrid
#
interface GigabitEthernet0/0/2.1
dot1q termination vid 20
ip address 10.10.20.1 255.255.255.0
arp broadcast enable
#
ospf 1
area 0.0.0.0
network 10.10.20.0 0.0.0.255
network 10.10.30.0 0.0.0.255
#
return

Hi @user_3808562
First of all, it is IMPOSSIBLE to modify the router to send and receive untagged packets on the sub-interface.
So, in your scenario, you can set the switch to tag VLAN 60, rather than sending the VLAN 60 packets untagged.