Many inexpensive Frame Relay services are based
on a CIR of 0. A CIR of 0 means that every frame is a DE frame, and the network
throws any frame away when it needs to. The DE bit is within the address ?¬?eld of the
Frame Relay frame header.
?– Inverse Address Resolution Protocol (ARP): A method of dynamically associating
the network layer address of the remote router with a local DLCI. Inverse ARP allows
a router to automatically discover the network address of the remote DTE device that
is associated with a VC.
?– Local Management Interface (LMI): A signaling standard between the router (DTE
device) and the local Frame Relay switch (DCE device) that is responsible for managing
the connection and maintaining status between the router and the Frame Relay switch.
NOTE With ANSI T1.617 and ITU-T Q.933 (Layer 3) and Q.922 (Layer 2), Frame
Relay now supports SVCs. Cisco IOS Release 11.2 or later supports Frame Relay
SVCs. This book does not cover information on con?¬?guring Frame Relay SVCs.
328 Chapter 8: Extending the Network into the WAN
?– Forward explicit congestion noti?¬?cation (FECN): A bit in the address ?¬?eld of the
Frame Relay frame header.
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