To enable the sending of complete
routing updates in a Frame Relay network, you can configure the router
with logically assigned interfaces called subinterfaces. Subinterfaces
are logical subdivisions of a physical interface. In a subinterface
configuration, each PVC can be configured as a point-to-point
connection, which allows the subinterface to act as a dedicated line,
as shown in Figure .
Early implementation of Frame Relay
required that a router (that is, a DTE device) have a WAN serial
interface for every PVC, as shown in Figure
By logically dividing a single physical WAN serial interface into multiple virtual subinterfaces, the overall cost of implementing a Frame Relay network can be reduced.
As shown in
Figure ,
a single router interface can service many remote locations through
individual unique subinterfaces.
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