Comtech EF Data SLM-5650A Installation And Operation Manual page 499

H.2.5.2 OSPF Test Solution
Multi- Time-Division Multiplexing (TDM) Tunneling is a technique where a VLAN "tunnel" is set up
between the Hub unit and any expansion units that are being used to create an SCPC link with a
Remote that is Home Stated to the specified Hub TDM Modem.
As shown in Figure H-5, if an IP tunnel is configured from each of the remote Autonomous
System Boundary Routers (ASBRs) to the OSPF routers at the hub, the two routers will attain
neighbor adjacency. All of the necessary OSPF messages will be exchanged to include the
remote shipboard network into the OSPF domain.
This configuration allows the network to automatically reconfigure to the lower-cost terrestrial link
when connected and automatically return to the higher-cost satellite link when the terrestrial link
is disconnected.
It is recommended that the hub OSPF router be a backbone router (area 0.0.0.0), and each of the
shipboard networks be a single OSPF area. This will reduce the amount of OSPF messaging
required to be transmitted over the satellite network.
Appendix I
Figure H-5. OSPF Test Solution
H–7
SLM-5650A Satellite Modem
Revision 10
MN-SLM-5650A