Frame relay is a packet-switching data Communications technology that can connect multiple network devices on a multipoint WAN (Wide Area Network), the design of Frame relay WANs can have impact on aspects or higher layer protocols such as IP, IPX, Apple Talk, (for Exmple, that split-horizon aspect of routing protocols). Frame relay is called a nonbroadcast multiaccess technology, because there is no broadcast channel. broadcasts are trasmitted by sending packets to all network destinations.
Two common topologies that can be used in a Frame Relay solution :
- Fully Meshed topology
Every frame relay network devices has a permanent Virtual circuit (PVC) to every other device on the multipoint WAN. any update sent by one device will be seen by every other. if this design is used, the entire Frame relay WAN van be treated as one data link.
- Partially Meshed topology
This is also often called a "star" or "hub-and-spoke" topology. in a partially meshed topology, not every device on the frame relay cloud has a PVC to every other device. in this topology, subinterfaces should be investigated and probably implemented to solve design issues. Frame relay WANs should be carefully designed with the above considerations is mind.
Dial-On-Demand Routing
Dial-on-Demand routing (DDR) enables you to make a standard telephone connection or an integrated services digital network (ISDN) connection only when required by the volume of network traffic, DDR may be less expensive than a leased line or multipoint solutions.
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