Passing tagged traffic on virtual links created by vr-xcon on CSRs

[udaykiran-chava]

Hi,
I have 2 CSRs connected via vr-xcon. When i configure ip address on direct main interfaces , the traffic works.
But if i configure ip addresses on subinterfaces with encapsulation, They cannot ping each other.
Configuration below. So i was wondering if this is a issue with vr-xcon proces.. Had anyone faced similar issues or knows a clue, pls reply. @plajjan You have any inputs ?.

CSR1:
interface GigabitEthernet12
description toCSR2
no ip address
negotiation auto
no mop enabled
no mop sysid
!
interface GigabitEthernet12.100
encapsulation dot1Q 100
ip address 5.1.1.2 255.255.255.252

CSR2:

interface GigabitEthernet12
description toCSR1
no ip address
negotiation auto
no mop enabled
no mop sysid
!
interface GigabitEthernet12.100
encapsulation dot1Q 100
ip address 5.1.1.1 255.255.255.252