Point-To-Multipoint Routing - Teledyne QMultiFlex-400 Installation And Operating Handbook

QMultiFlex-400™ Installation and Operating Handbook
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Figure 7-4 Q-NET™ Point-to-multipoint Bridged Network
Note that advanced IP features, including TCP acceleration can be used in point-to-
multipoint bridging mode. In these cases, the QMultiFlex-400™ and QFlex-400™
terrestrial IP traffic ports are typically addressless (i.e. IP address set to 0.0.0.0).
Assigning a traffic IP address in bridging mode can be useful as part of status monitoring
and fault detection. Being able to ping the IP traffic port allows a monitoring system to
confirm the traffic network is accessible at each modem and can help narrow down the
point in the network where there is a connectivity problem. This is particularly useful if the
IP traffic is run as a separate network to the M&C network and needs its own independent
monitoring system (for example, where the M&C network comes under control of the
operator while the traffic network remains the responsibility of the end user).
Note also that all forms of Ethernet frame extension, including VLAN tags, MPLS labels
and jumbo frames (of up to 10kbytes) are handled correctly, with fully transparent satellite
operation as expected.
7.2.2

Point-to-Multipoint Routing

In routing mode, the QMultiFlex-400™ and QFlex-400™ modems act as two-port routers,
with the terrestrial IP port being on one subnet and the satellite port being on another
subnet. (The M&C network can be on yet another subnet.) The satellite ports of all
QMultiFlex-400™ and QFlex-400™ devices are configured to be on the same subnet.
Each QFlex-400™ remote modem can be configured to have a unique terrestrial subnet,
as required. Routers attached to the modems then allow other networks to be connected.
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