Lab
8.3.4: Configuring Frame Relay with Subinterfaces
Objectives:
Configure Frame Relay to function correctly using
sub-interfaces.
Scenario:
You have been contracted by a small bank to install a Frame Relay
network to connect their offices in Atlanta, Orlando, and Houston.
Each office needs to connect to the other two. You have ordered Frame Relay
service from a national Frame Relay service provider and
have received the DLCIs in the above diagram. Routing should be
handled using IGRP.
Notes:
Lab Tasks:
Cable the lab as shown in the diagram. Use the Adtran Atlas 550
to simulate the Frame Relay network. Start with a clean
configuration on all routers.
Configure the Ethernet interfaces on all three routers.
Configure IGRP using AS# 100 on all three routers.
Configure the serial interfaces that connect to the Frame Relay network for
Frame Relay encapsulation and set the LMI type to
ANSI.
Create the sub-interfaces on each router as a point-to-point
sub-interface using the DLCI number as the sub-interface number.
Also, configure the Frame Relay DLCI for each sub-interface.
What command is used to assign the Frame Relay DLCI to each
sub-interface?
Check your PVCs to make sure they are active with the
show
frame-relay pvc
command. Once all of your PVCs are active, check
your routing tables and connectivity. You may need to give your
network a minute or so for the PVCs to become active.
Examine the routing table. Notice how the routing table reflects
routes to PVCs (sub-interfaces) just as it would if you had
point-to-point leased line connections.
What are some advantages of using point-to-point sub-interfaces
in a Frame Relay network?