Every 10
seconds, the router exchanges LMI information with the switch (keepalives).
NOTE If Inverse ARP is not working or the remote router does not support Inverse
ARP, you must manually con?¬?gure static Frame Relay maps, which map the local
DLCIs to the remote network layer addresses.
1
DLCI = 100
Frame Relay
Cloud
172.168.5.5
DLCI = 400
172.168.5.7
Status Inquiry
Local DLCI 100 = Active
Status Inquiry
Local DLCI 400 = Active
Hello, I am 172.168.5.5.
2
4
3
2
3
334 Chapter 8: Extending the Network into the WAN
7. The router changes the status of each DLCI to active, inactive, or deleted, based on the
LMI response from the Frame Relay switch.
Figure 8-28 illustrates Steps 5??“7 of this process.
Figure 8-28 Stages of Inverse ARP and LMI Operation Continued
Configuring Frame Relay
A basic Frame Relay con?¬?guration assumes that you want to con?¬?gure Frame Relay on one
or more physical interfaces and that the routers support LMI and Inverse ARP.
The following steps are used to con?¬?gure basic Frame Relay:
Step 1 Select the interface needed for Frame Relay. Use the interface con?¬?guration mode.
RouterX(config)# iinntteerrffaaccee sseerriiaall11
After the interface con?¬?guration is entered, the command-line interface (CLI)
prompt changes from (con?¬?g)# to (con?¬?g-if)#.
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