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Basic Frame Relay Configuration
North American routers are configured to have frame relay enabled as
the default setting. With frame relay enabled, the router will
communicate over WAN connections to other frame relay units via
frame relay Permanent Virtual Circuits (PVC). From 1 to 40 PVC’s
may be defined to connect to other frame relay units. Before the
router can establish a PVC connection to another frame relay router, at
least one PVC must be defined. The router is pre-configured to query
the frame relay service to auto-learn the required parameters; they may
also be set manually.
The DLCI (Data Link Connection Identifier) number for the PVC is
assigned by the frame relay service provider. The PVC must be defined
on the physical link on the router. Refer to the following diagram that
shows three router units connected together with a PVC being
configured on each unit. The configuration of the PVCs within the
frame relay cloud is controlled by the frame relay service provider.
Figure 2 - 1 Frame Relay configuration
Frame Relay PVC
WAN connections
DLCI numbers
assigned for these
PVCs from the
frame relay provider.
51 52
55