If we have VC 5, then R2 will remove dot1q tag from the frame it receives from R1 before sending it to the core.
Quote from the above link:
EoMPLS is one of the AToM transport types. EoMPLS works by encapsulating Ethernet PDUs in MPLS packets and forwarding them across the MPLS network. Each PDU is transported as a single packet. Cisco IOS Release 15.0SY supports two EoMPLS modes:
•VLAN mode—Transports Ethernet traffic from a source 802.1Q VLAN to a destination 802.1Q VLAN through a single VC over an MPLS network. VLAN mode uses VC type 5 as default (no dot1q tag) and VC type 4 (transport dot1 tag) if the remote PE does not support VC type 5 for subinterface (VLAN) based EoMPLS.
•Port mode—Allows all traffic on a port to share a single VC across an MPLS network. Port mode uses VC type 5.
However I performed the lab, I found R2 is not doing that. R1 sends a ARP message which is received by R2. R2 sees a Vlan tag 200 on the the ARP message from R1. R2 even though has negotiated Vc type 5, did not remove dot1q tag 200 as it should based on the above Cisco.s link
Below is wireshark capture Between R2 and R3
No. Time Source Destination Protocol Length Info
277 161.435000 c0:00:14:c4:00:00 Broadcast ARP 90 Who has 10.10.10.2? Tell 10.10.10.1
Another difference between the port-tunneling mode and VLAN-tunneling mode is in the
handling of VLAN IDs. In port-tunneling mode, the VLAN ID is transparently passed from the
ingress PE to the egress PE over MPLS in a single VLAN.
This is exactly what I observed in my lab, regardless if the frame is tagged or untagged, PE router simply encapsulates the whole frame except for preamble and FCS in new ethernet with two mpls labels and control word and sends it over the pseudowire eventhough VC type was 5( Ethernet)
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