SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
2.2 VLAN Forwarding and IP Routing
2.2.1 VLAN Support
2.2.1.1 Introduction
It is possible to use VLANs (Virtual LAN) on the Ethernet interfaces.
VLANs are virtual Ethernet links on top of 1 physical Ethernet link.
These VLANs are interesting when a HUB modulator gives access to multiple
remote sites:
• Without VLANs, the modulator can perform static routing, and send the traffic to
the right destination by looking up the destination IP address;
• With VLANs, the modulator forwards IP transparently: there is at least one
VLAN to each remote site.
In this case, the routing is under responsibility of the router. This router can
perform dynamic routing, by making use of routing protocols. Routing
information can be sent transparently over the satellite link, to the neighbour
routers at the other side of the satellite link.
Figure 7 –With/Without VLANS
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