Avaya Configuring Frame Relay Services Bedienungsanleitung PDF herunterladen (Seite 32)

Configuring Frame Relay Services

2-12 117376-A Rev. A

Trafﬁc Control

Frame relay is unreliable. It does not include error recovery mechanisms, relying

instead on the upper layer protocols to detect and retransmit lost frames.

Hub and spoke topologies often present a “big pipe/little pipe” situation. The

central or hub site has a faster link to the frame relay service because it is a point

of concentration for many remote sites: it has a “big pipe,” with, for example, a

T1/E1 connection that can transmit data at rates of 1.54 Mb/s. The remote sites

usually support a much lower line speed, 56 Kb/s to 64 Kb/s, or “little pipe.”

igure 2-7 illustrates this concept.

Table 2-1. How Protocols Handle Address Resolution

Protocol

How Router Performs

Address Resolution Conﬁguration Requirements

Bridge (including

source route) Automatic None

IP ARP

Inverse ARP

Conﬁgure ARP

Conﬁgure Inverse ARP

DECnet IV Automatic None

VINES ARP

Inverse ARP

None for ARP

Inverse ARP is the default for

frame relay.

Internet Packet

Exchange (IPX)

Automatic None

Xerox Networking

System (XNS)

Automatic None

AppleTalk AppleTalk ARP None

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Avaya Configuring Frame Relay Services Bedienungsanleitung Seite 32