AIS Router AI2524 - Manual (Page 334)

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:
z Configure Frame Relay Subinterfaces
z Configure Frame Relay Switching
z Disable or Reenable Frame Relay Inverse ARP
z Create a Broadcast Queue for an Interface
z Configure Payload Compression
z Configure TCP/IP Header Compression
z Configure Discard Eligibility
z Configure DLCI Priority Levels
Configure Frame Relay Subinterfaces
To understand and define Frame Relay Subinterfaces, perform these
tasks:
z Understand Frame Relay Subinterfaces
z Define Frame Relay Subinterfaces
z Define Subinterface Addressing
After these tasks are completed, you can also perform these optional
tasks:
z Configure Transparent Bridging for Frame Relay
z Configure 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 received on an interface cannot be trans
mitted out the same interface even if the packet is received and trans
mitted on different virtual circuits.