Comtech EF Data SLM-5650A - Manual (Page 407)

SLM-5650A Satellite Modem Revision 8
Appendix E MN-SLM5650A
E–3
satellite link, or to a lower-cost link, such a terrestrial fiber, based upon availability. The
possibility of such a solution is examined in the following use case.
E.2.4 OSPF Maritime Use Cases
The maritime use cases presented here depicts application of OSPFv2 as part of a deployed
network of routers that includes the SLM-5650A Network Processor (NP) Interface.
The primary objective of these use cases is to describe the process of automatically re-routing
traffic when alternative transmission links are available in a maritime environment. Specifically,
the satellite link should be used when at sea, and the high-speed terrestrial link should be used
when at shore. This switch should occur automatically.
If other communication links such as ship-to-ship or back-up lower-speed satellite networks are
available, then the OSPF routing protocol will select the best path as defined by link cost.
E.2.4.1 OSPF Use Case: At Shore
When at shore, as depicted in Figure E-2, the shipboard OSPF network automatically re-routes
packets destined to non-shipboard networks over the high-speed, low-cost network.
Figure E-2. OSPF Support at Shore