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FRAME-RELAY



Packet switching

This is a WAN switching method that allows you to share bandwidth with other companies to save money.Packet switching can be thought of as a network that’s designed to look like a leased line yet charges you more like circuit switching. But less cost isn’t always better—there’s definitely a downside: Packet switching will only work for you if your data transfers are the bursty type—not continuous. Frame Relay and X.25 are packet-switching technologies with speeds that can range from 56 Kbps up to T3 (45 Mbps).

Frame Relay

FrameRelay is a high-performance Data Link and Physical layer specification. Frame Relay is that it can be more cost effective than point-to-point links, plus it typically runs at speeds of 64 Kbps up to 45 Mbps. Another Frame Relay benefit is that it provides features for dynamic bandwidth allocation and congestion control.

Frame Relay is still one of the most popular WAN services deployed over the past decade, and there’s a good reason for this—cost!

By default, Frame Relay is classified as a non-broadcast multi-access (NBMA) network,meaning it doesn’t send any broadcasts.

Committed Information Rate (CIR)

Frame Relay provides a packet-switched network to many different customers at the same time. This is a really good thing because it spreads the cost of the switches among many customers. But remember, Frame Relay is based on the assumption that all customers won’t ever need to transmit data constantly, and all at the same time.

There are two separate bandwidth specifications with Frame Relay:

    Access rate

    The maximum speed at which the Frame Relay interface can transmit.

    CIR

    The maximum bandwidth of data guaranteed to be delivered

Data Link Connection Identifiers (DLCIs)

Frame Relay PVCs are identified to DTE end devices byData Link Connection Identifiers(DLCIs). A Frame Relay service provider typically assigns DLCI values, which are used onFrame Relay interfaces to distinguish between different virtual circuits. Because many virtualcircuits can be terminated on one multipoint Frame Relay interface, many DLCIs are oftenaffiliated with it.



On Router 1

Router # config terminal

Router (config) # interface serial 0/0

Router (config-if) # encapsulation frame-relay

Router (config-if) # frame-realy map ip 10.1.1.2 102 broadcast

Router (config-if) # frame-realy map ip 10.1.1.3 103 broadcast


On Router 2

Router # config terminal

Router (config) # interface serial 0/0

Router (config-if) # encapsulation frame-relay

Router (config-if) # frame-realy map ip 10.1.1.1 201 broadcast

Router (config-if) # frame-realy map ip 10.1.1.3 203 broadcast


On Router 3

Router # config terminal

Router (config) # interface serial 0/0

Router (config-if) # encapsulation frame-relay

Router (config-if) # frame-realy map ip 10.1.1.2 302 broadcast

Router (config-if) # frame-realy map ip 10.1.1.1 301 broadcast








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