
Frame Relay Overview
117376-A Rev. A 2-7
Multiple Service Records
Interfaces can have multiple service records, and each service record can contain
multiple PVCs.
Adding and Moving PVCs
You can add PVCs to a service record either individually, or in a range. You can
also move PVCs on the same interface from one service record to another
individually or as a group. See Cha
pter 3 for instructions.
Frame Relay Access Modes
Bay Networks describes frame relay in terms of three access modes: group, direct,
and hybrid. The following sections define each of these modes within the context
of service records.
Group Access Mode
Group mode describes a service record with multiple PVCs. It represents a true
point-to-multipoint circuit. In group access mode, upper-layer protocols treat each
frame relay network interface as a single access point to the switched network.
The upper-layer protocols use a single network address to send all traffic destined
for the switched network to the frame relay network interface. When you
configure each router, you assign only one network address -- for example, an IP
or IPX address -- to the frame relay interface, not to each PVC. The Data Link
Control Management Interface (DLCMI) dynamically configures PVCs on the
default service record; you do not need to explicitly configure them.
Service records in group mode:
• Allow multiple groups of PVCs per frame relay connection.
• Enable you to gather multiple PVCs for each network protocol into a separate
group or service record, thereby reducing the number of buffers needed per
circuit during broadcasts.
• Lower customer costs by creating multiple broadcast domains.
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