Comtech EF Data SLM-5650A - Manual (Page 410)

SLM-5650A Satellite Modem Revision 8
Appendix E MN-SLM5650A
E–6
E.2.5.2 OSPF Test Solution
Multi-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 Time-Division Multiplexing (TDM) Modem.
As shown in Figure E-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.
Figure E-5. OSPF Test Solution