+--------+ | Sender | +---+----+ Multicast-enabled | Sending Network +-----------|-------------------------------+ | v | | +------------+ +=======+ +=======+ | | | Agg Router | | AMT | | AMT | | | +------------+ | relay | | relay | | | | +=======+ +=======+ | | | | | | | +-----+------+--------+---------+ | | | | | | +--------+ +--------+ | | | Border |---| Border | | | | Router | | Router | | | +--------+ +--------+ | +-----|------------|------------------------+ | | v v Internet (non-multicast)