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Chapter 13: AI2524 Frame Relay Configuration Steps
August 1997 Page 13-21
2524UM
Define Subinterface Addressing
For point-to-point subinterfaces, the destination is presumed to be
known and is identified or implied in the
frame-relay inter-
face-dlci
command. For multipoint subinterfaces, the destinations
can be dynamically resolved through the use of Frame Relay Inverse
ARP or can be statically mapped through the use of the
frame-
relay map
command.
Addressing on Point-to-Point Subinterfaces
If you specified a point-to-point subinterface in Step 3 unde Define
Frame Relay Subinterfaces, type (in interface configuration mode):
frame-relay interface-dlci
dlci
[
option
]
If you define a subinterface for point-to-point communication, you
cannot reassign the same subinterface number to be used for multi-
point communication without first rebooting the router or access
server. Instead, you can simply avoid using that subinterface numbe
and use a different subinterface number instead.
Examples: Basic Subinterface
In this example, subinterface 1 models a point-to-point subnet and sub-
interface 2 models a broadcast subnet. For emphasis, the multipoint
keyword is used for serial subinterface 2, even though a subinterface
is multipoint by default.
interface serial 0
encapsulation frame-relay
interface serial 0.1 point-to-point
ip address 10.0.1.1 255.255.255.0
frame-relay interface-dlci 42
interface serial 0.2 multipoint
ip address 10.0.2.1 255.255.255.0
frame-relay map 10.0.2.2 18
Addressing on Multipoint Subinterfaces
If you specified a multipoint subinterface in Step 3 under Define
Frame Relay Subinterfaces, perform the tasks in one or both of the
these sections:
z
Accept Inverse ARP for Dynamic Address Mapping on Multi-
point Subinterfaces
z
Configure Static Address Mapping on Multipoint Subinterfaces