Q-Flex Satellite Modem Installation and Operating Handbook
6-47
Figure 6-22 Edit->IP Screen
6.2.2.1 IP Mode
Table 6-50
shows the
IP mode
options. The operation of the M&C and IP Traffic Ethernet
ports is summarized in
Table 6-51
.
Bridge mode
In this mode the modem acts as an Ethernet bridge, preserving the
original Ethernet frames (including additional fields such as VLAN and
MPLS headers) over satellite.
Routing
mode
In this mode IP packets are forwarded based on the contents of the
modem’s routing table, which can be configured manually with static
routes or controlled dynamically by enabling dynamic routing. Dynamic
routing populates the routing table based on information forwarded by
other routers in the network. The modem operates as a two-port router in
this mode (with separate terrestrial and satellite IP addresses).
Trunking
mode
Trunking mode implements a Layer 2 bridge in hardware. This results in a
much higher packet handling capability (up to 500,000 packets per
second as opposed to a maximum of 150,000 packets per second when
in other modes). Because the processor is bypassed in this mode, jitter is
also minimised and typically registers as zero when measured with
Ethernet test equipment. ACM (and AUPC) can be used in Trunking mode
but other IP features such as TCP acceleration cannot be used because
they require the packets to be passed through the processor.
Table 6-50 IP Mode
