Release Notes for Router Software Version 11.00 Revision 4n
26 114968-A Rev. A
Service Records and Direct Access Mode
In direct access mode, upper-layer protocols treat the Frame Relay network as a
series of point-to-point connections. The upper-layer protocols view each PVC as
an individual network interface.
Direct access mode advantages are that it
• Limits broadcasts to one PVC.
• Enables multiple layer-three networks per interface.
Direct access mode disadvantages are that it
• Creates a new Frame Relay circuit for each PVC, consuming router resources.
• Allows only one PVC per network.
Service Records and Direct Mode
A service record with a single PVC is the same as a direct access mode PVC.
Using service records to define Frame Relay removes the need to think in terms of
direct mode.
Service Records and Hybrid Access Mode
Hybrid access mode, as its name implies, combines characteristics of group and
direct access modes. It works only for non-fully meshed network configurations
that use both bridging and routing over a single Frame Relay interface. This mode
is also best for spanning tree bridging.
You configure hybrid mode by enabling the hybrid mode service record
parameter. See Chapter 3, “Customizing Frame Relay,” for instructions.
Default Service Record
The router creates the first service record automatically. This first service record is
called the default service record. Any PVCs that are not associated with a
configured service record use the default service record.
