Nexus Double Tagging VLAN

[ahmedfakkar]

Hello,

I have a Cisco 2900 which WAN interface works with double VLAN tagging as below,

interface GigabitEthernet0/0.1501
encapsulation dot1Q 2525 second-dot1q 1501
ip address 172.26.145.34 255.255.255.252

I am trying to migrate this Cisco router to Nexus 3K but i am struggling in achieving the same situation, Once i connect the Nexus and configure dot1q-tunnel, i can't ping my ISP anymore.

Please let me know your thoughts.

Regards,

Ahmed Fakkar

[balaji.bandi]

Can you post the nexus 3K config?

[ahmedfakkar]

VLAN 1501
name WAN

interface eth1/47
switchport mode dot1q-tunnel
switchport vlan mapping 1501 dot1q-tunnel 2525

interface vlan 1501
ip address 172.26.145.34 255.255.255.252
no shutdown

[Giuseppe Larosa]

Hello @ahmedfakkar ,

802.1Q tunneling is a transport solution for double tagged 802.1Q frames it is not good for a CE side. So the fact you can't ping ISP with 802.1Q tunnel in place is somewhat expected.

Here you would need the equivalent of the configuration you have on current router if supported on NX-OS on the Nexus 3K

See the attached file that is the Configuration guide for interfaces  Nexus 3000 NX OS 7.x series

It looks like you cannot configure a subinterface with two VLAN tags.

Hope to help

Giuseppe

[ahmedfakkar]

Hello Giuseppe,

do you mean it is not doable on the nexus?