You can configure subinterfaces to support the following
connection types:
- Point-to-point -- A single subinterface
is used to establish one PVC connection to another physical
interface or subinterface on a remote router. In this case, the
interfaces would be in the same subnet, and each interface would
have a single DLCI. Each point-to-point connection is its own
subnet. In this environment, broadcasts are not a problem because
the routers are point-to-point and act like a leased line.
- Multipoint -- A single subinterface is
used to establish multiple PVC connections to multiple physical
interfaces or subinterfaces on remote routers. In this case, all
the participating interfaces would be in the same subnet, and each
interface would have its own local DLCI. In this environment,
because the subinterface is acting like a regular Frame Relay
network, routing updates are subject to split horizon.
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