MARITIME TACTICAL WIDE AREA NETWORKING (MTWAN ...

Uncontrolled copy when printedUNCLASSIFIEDACP 200(B) Vol 2ROUTING PROTOCOLS113. An MTWAN employs standard IP routing protocols to achieve connectivity. This hasthe advantage of utilizing Commercially-Off-The-Shelf (COTS) equipment, but constrains theamount of configuration that can be done to the network. Routing is achieved using standardprotocols Open Shortest Path First (OSPF) and Protocol Independent Multicast (PIM) forrouting within the AS (interior-AS routing), and Border Gateway Protocol Version 4 (BGP4)for routing between AS‘s (exterior-AS routing). Figure 1-4 shows a MTWAN that comprises asingle-AS TGAN and depicts where BGP4 and OSPF are deployed. Detailed information onthe routing architecture can be found in Chapter 15COMMUNICATIONS ARCHITECTURE (CA)114. The communication subnets within a TGAN, such as those shown in Figure 1–4 aresupported by point-to-point and multi-member (shared) links.POINT-TO-POINT115. Point-to-point links are communication bearers that connect two nodes in either fullduplexor half-duplex mode. Examples of full-duplex point-to-point links are INMARSAT andSHF. A half-duplex point-to-point link between two nodes can be established using radiosoperating on a single frequency as only one node can transmit at any one time.1-5UNCLASSIFIEDOriginal