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QMultiFlex-400™ Installation and Operating Handbook
8.4.4
IP Addressing and Operation in Redundancy Configurations
8.4.4.1 1:1 IP Operation
The following rules should be observed when using 1:1 redundancy for IP.
1. In 1:1 mode, the M&C IP addresses need to be different for each modem.
2. In 1:1 mode, if using IP traffic addresses (e.g. in routing mode), these also need to
be different for each modem. In bridging modes, the IP traffic address is not used.
3. The M&C Ethernet port must not be bridged to the IP traffic port (this is controlled
via the Bridge M&C control on the Edit->IP screen).
4. The M&C IP address and the traffic IP address should be on different subnets. The
modem defines one default gateway. If the second subnet also requires a gateway,
then a static route should be added that defines a gateway for that subnet.
On the 1:1 Standby modem, the carrier is muted, as is the satellite receive port (in order to
ensure that no received data is passed out of the terrestrial port). The M&C port and the
terrestrial IP traffic port are not muted.
If a switchover occurs when in bridging mode, the Standby modem will automatically learn
to bridge the traffic as necessary, once it comes online.
If static routing is being used, then the M&C system will need to detect that a switchover
has occurred and update the routes accordingly for the new IP address associated with the
online modem. Some network devices support route failover, which automates this
process. In this case the M&C system router that supports route failover should be
configured to include another route in the routing table with a higher 'metric' or 'distance'
for the route that uses the Standby modem's IP traffic address. The switchover to using the
Standby modem will then be automatic when it detects the path through the primary modem
is no longer available.
8.4.4.2 1:N IP Operation
The following rules should be observed when using 1:N redundancy for IP.
5. In 1:N mode, the M&C IP addresses need to be different for each modem.
6. In 1:N mode, the IP traffic addresses should be set to be the same in both
modems. The IP traffic port on the Standby modem is physically isolated from the
network via a relay contact, which ensures that having identical IP addresses does
not cause any problems.
7. The M&C Ethernet port must not be bridged to the IP traffic port (this is controlled
via the Bridge M&C control on the Edit->IP screen).
8. The M&C IP address and the traffic IP address should be on different subnets. The
modem defines one default gateway. If the second subnet also requires a gateway,
then a static route should be added that defines a gateway for that subnet.
On the 1:N Standby modem, the carrier is muted. The IP traffic port remains active but is
physically isolated from the network. The M&C port is not muted, allowing the M&C system
to always control the Standby modem.
The switchover operation in relation to bridging and routing is similar to that for 1:1
operation.
8-28
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