ABR uses IBGP and peers between systemIP or loopback IP addresses, as shown in Figure: ABR and IBGP.
Figure: ABR and IBGP
The generate-basic-fec-only command is supported on leaf PE and ABR nodes. The generate-basic-fec-only command only interoperates with intra-AS as option C, or opaque type 7 with inner opaque type 1. No other opaque type is supported.