Double tagged traffic on L3 Interface

Answered Question
Feb 10th, 2012

Hello All,

Traffic tagged with outer vlan 3050 and inner vlan 350 isn't matching the following L3 interface configuration:

interface GigabitEthernet0/4/0/28.3050

vrf ABC

ipv4 address 20.0.0.11 255.255.255.0

encapsulation dot1q 3050

Even with no second tag configured should´t the outer vlan match vlan 3050 configured on the interface ?

Many thanks for your help!

David

I have this problem too.
0 votes
Correct Answer by Alexei Kiritchenko about 3 years 1 month ago

Hello David,

Unambiguous vlan definition works for L2 interfaces.

For L3 you should define 2nd tag too.

!

interface GigabitEthernet0/4/0/28.3050

vrf ABC

ipv4 address 20.0.0.11 255.255.255.0

encapsulation dot1q 3050 second-dot1q 350

!

Regards,

/A

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Correct Answer
Alexei Kiritchenko Fri, 02/10/2012 - 08:01

Hello David,

Unambiguous vlan definition works for L2 interfaces.

For L3 you should define 2nd tag too.

!

interface GigabitEthernet0/4/0/28.3050

vrf ABC

ipv4 address 20.0.0.11 255.255.255.0

encapsulation dot1q 3050 second-dot1q 350

!

Regards,

/A

dfranjoso Fri, 02/10/2012 - 08:41

Thanks Akiritch, once again for your prompt response.

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Posted February 10, 2012 at 4:40 AM
Updated February 10, 2012 at 4:41 AM
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