AI2524 Router Card User’s Manual
Page 13-18 August 1997
2524UM
Customize Frame Relay for Your Network
Perform these tasks to customize Frame Relay:
zConfigure Frame Relay Subinterfaces
zConfigure Frame Relay Switching
zDisable or Reenable Frame Relay Inve rse ARP
zCreate a Broadcast Queue for an Interface
zConfigure Payload Compression
zConfigure TCP/IP Header Compression
zConfigure Discard Eligibility
zConfigure DLCI Priority Levels

Configure Frame Relay Subinterfaces

To understand and define Fram e Relay Subinterfaces, perform these
tasks:
zUnderstand Frame Relay Subinterfaces
zDefine Frame Relay Subinterfaces
zDefine Subinterface Addre ssing
After these tasks are completed, you can also perform these optional
tasks:
zConfigure Transparent Bridging for Frame Relay
zConfigure a Backup Interface for a Subinterface

Understand Frame Relay Subinterfaces

Frame Relay subinterfaces provide a mechanism for supporting par-
tially meshed Frame Relay networks. Most protocols assume transitiv-
ity on a logical network; that is, if station A can talk to station B, and
station B can talk to station C, then station A should be able to talk to
station C directly. Transitivity is true on LANs, but not on Fram
Relay networks unless A is directly connected to C.
Additionally, certain protocols such as transparent bridging cannot b
supported on partially meshed networks because they require "split
horizon," in which a packet r eceived on an interface cannot be trans
mitted out the same interface even if the packet is received and trans
mitted on different virtual circuits.