Avaya Configuring Frame Relay Services Manuel d'utilisateur Page 40

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Configuring Frame Relay Services
2-14 117376-B Rev. 00
Address Resolution for SVCs
For SVCs, adjacent host configuration including either an E.164 or X.121 address
eliminates the need for the router to do address resolution.
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.
F
igure 2-7 illustrates this concept.
Table 2-2. How Protocols Handle Address Resolution
Protocol
How Router Performs
Address Resolution Configuration Requirements
Bridge (including
source route) Automatic None
IP ARP
or
Inverse ARP
Configure ARP
Configure Inverse ARP
DECnet IV Automatic None
VINES ARP
or
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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