In Inter-AS Option C, the PEs in two different ASs have their system IP address in the RTM, but the intermediate nodes in the remote AS do not have the system IP of the PEs in their RTM. As such, for NG-MVPN, a recursive opaque value in mLDP FEC is needed to signal the LSP to the first ASBR in the local AS path.
The recursive opaque type used for Inter-AS Option B is the Recursive Opaque (Basic Type), shown as opaque type 7 in Table 1.