
Frame Relay Overview
114058 Rev. A 2-5
Frame Processing
When a frame enters a Frame Relay network, the network performs three steps to
process the data:
1. Verifies the cyclic redundancy check (CRC); if an error is found, it drops the
frame.
2. Performs a table lookup for the DLCI; if the DLCI is invalid or unknown, it
drops the frame.
3. If the frame is valid, forwards it to its destination.
Frame Relay Service Records
Bay Networks uses service records to define Frame Relay circuits. A service
record is a data structure that allows flexible grouping and characterization of
PVCs. A service record can contain a single PVC or multiple PVCs.
Service records
• Support all protocols
• Simplify network addressing because you define and associate only one
protocol address with groups of Frame Relay PVCs
• Allow multiple groups of PVCs per Frame Relay interface
• Enable you to group multiple PVCs for each network protocol into separate
service records, thereby reducing the number of buffers needed per circuit
during broadcasts
• Lower customer costs by creating multiple broadcast domains
• Conserve resources because they require a small number of circuits
• Are easy to configure
Default Service Record
The router creates the first service record automatically when you select Frame
Relay as your WAN protocol. This first service record is the default service
record. Any PVCs not associated with another configured service record use the
default service record.
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