L2oGRE is supported for IPv4 and IPv6 transport with a termination IP address that must reside in the base router. Multiple L2oGRE tunnels can share the same termination IP address.
Each L2oGRE tunnel is represented by a unique pair of tunnel-end IP addresses. As the local endpoint address in VSR is usually shared between the tunnels, the tunnel far-end IP address becomes a differentiating field.
In VSR, an L2oGRE tunnel is represented by an SDP, which is then mapped as a spoke-SDP to a Flex PW port. Although it is mandatory to configure a VC-ID, in spoke-SDP the VC-ID loses its meaning because of the nature of L2oGRE tunnel: no sub-tunnels based on an MLPS label can be multiplexed within the two L2oGRE endpoints.