Router Working Mode - Point-To-Multipoint; Figure 16-3. Router Mode, Point-To-Multipoint Diagram - Comtech EF Data CDM-570 Installation And Operation Manual

CDM-570/570L Satellite Modem with Optional IP Module
Typical IP Module Operation Setups
16.3.3 Router Working Mode – Point-to-MultiPoint
PC
IP 10.10.1.100/16
GW 10.10.1.1
Static Routes
IP Dest
10.20.0.0/16
10.30.0.0/16
239.255.30.10
239.255.30.11
RX HDLC Addresses - 0x01
"Star Network" Point-to-MultiPoint Configuration - Here, Hub CDM-IP 1 is
transmitting a common 2.048 Mbps link to 2 remote CDM-IPs. In turn, Remote CDM-IP
3 is transmitting a 256 kbps link back to Hub CDM-IP 1. Remote CDM-IP 4 is also
transmitting a 256 kbps link back to the Hub, but it is a separate link to Hub CDM-IP 2.
Since this is a Point-to-MultiPoint configuration, HDLC addressing is used so that the
traffic not intended for a particular destination can be filtered. For unicast traffic, it is best
to associate a unique HDLC address for each site in the network. For this case, the Hub
Site is HDLC 0x01, Remote A is HDLC 0x02 and Remote B is 0x03. Each CDM-IP
modem would select the HDLC address associated with its site as a RX HDLC Address,
so both CDM-IP modems at the Hub would have 0x01 as the first RX HDLC Address,
CDM-IP 3 would have 0x02 and CDM-IP 4 would have 0x03.
Hub CDM-IP 1 has static routes defined for both remote CDM-IP subnets with the Next
Hop HDLC address being the HDLC address associated with the remote site. Both
remote CDM-IPs have static routes to the hub with the next Hop being HDLC 0x01. The
Satellite dish
RX
TX
RX
Hub CDM-IP 1
(efi0) 10.10.1.1/16
Next Hop Type
0x02 ToSat
0x03 ToSat
0x10 ToSat
0x11 ToSat
Hub CDM-IP 2 (RX Only)
(efi0) 10.10.1.2/16
Static Routes
IP Dest Next Hop Type
0.0.0.0/0 10.10.1.1 ToEth
RX HDLC Addresses - 0x01

Figure 16-3. Router Mode, Point-to-Multipoint Diagram

Satellite
Remote A, CDM-IP 3
(efi0) 10.20.1.1/16
Static Routes
IP Dest
10.10.0.0/16
239.255.30.10
RX HDLC Addresses - 0x02, 0x10
Satellite dish
RX
TX
Remote B, CDM-IP 4
(efi0) 10.30.1.1/16
Static Routes
IP Dest Next Hop
10.10.0.0/16 0x01
239.255.30.10 N/A
239.255.30.11 N/A
RX HDLC Addresses - 0x03, 0x10, 0x11
16–6
MN/CDM570L.IOM
PC
IP 10.20.1.100/16
Satellite dish
GW 10.20.1.1
RX
TX
Next Hop Type
0x01 ToSat
N/A Sat-to-LAN
PC
IP 10.30.1.100/16
GW 10.30.1.1
Type
ToSat
Sat-to-LAN
Sat-to-LAN
Revision 3