Research Article
QoS-Based Multicast Routing in Network Function Virtualization-Enabled Software-Defined Mobile Edge Computing Networks
| | | PIM-SM | SDM | SDUM |
| | Incremental implementation | All routers in the network need to install multicast protocol | No legacy router allowed in SDM domain | Support hybrid networks; only operation nodes are OpenFlow demand | | Scalability | Low (distributed routers of multiple ISPs result in difficulty to use same multicast mechanism) | Low (in the current evolution network, it is hard to build a pure large-scale SDN) | High (virtualized network on top of hybrid network is possible) | | ISP control | Low (distributed legacy routers are hard to be managed) | High (centralized control of OFSs in SDM domain) | High (centralized control of fork OFSs distributed in the network) | | Access control | Some specific protocols are necessary, for example, IGMP-AC and SIGMP | No concern | Source, receiver, and on-the-fly traffic management and control |
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