Atm Pvc Auto Discovery on End Routers

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R?(config)# interface atm l/0

R?(config-if)# ip address l0.l.l.l 255

.255.255.0

R?(config-if)# pvc

ILMI 0/l6 ilmi

R?(config-if-atm-v

:)# exit

R?(config-if)ft atm

ilmi-pvc-discovery

R?(config-if)ft end

R?# show atm vc

VCD /

Peak

Avg/Min Burst

Interface Name

VPI VCI Type

Encaps

SC Kbps Kbps

Cells Sts

l/O ILMI

O 16 PVC

ILMI

UBR 155OOO

UP

l/O 2

? ?O PVC-

D SNAP

UBR 155OOO

UP

ILMI uses the VPI/VCI pair of 0/16 Inverse ARP is enabled by default when you create a PVC using the pvc command or when a PVC is auto-discovered using the command above

© 2OO2, Cisco Systems, Inc. All rights reserved. Cisco CCIE Prep v1.O—Module 4-3O

You can use Integrated Local Management Interface (ILMI) to discover and configure the PVCs. ILMI uses what it gets from the adjacent switch. The router discovers the PVCs configured on the switch and configures the PVCs and their traffic parameters on the ATM main interface or subinterface that you specify.

In order to use this feature, first configure the PVC that ILMI will use, with the following commands in interface configuration mode:

pvc [name] 0/16 ilmi atm ilmi-pvc-discovery [subinterface]

Inverse ARP is enabled by default when you create a PVC using the pvc command or when a router auto-discovers a PVC by using the previous syntax. As a result, a configured protocol mapping between an ATM PVC and the router learns a network address dynamically because of the exchange of ATM Inverse ARP packets.

In this example, the service provider has reserved the VPI/VCI values of 7/70 for your PVC.

The router will automatically discover these values using ILMI. Examine the output shown below:

R7(config)# interface atm 1/0

R7(config-if)# ip address 10.1.1.1 255.255.255.0 R7(config-if)# pvc ILMI 0/16 ilmi

R7(config-if-atm-vc)# exit R7(config-if)# atm ilmi-pvc-discovery

R7(config-if)# end

R7# show atm vc

Interface Name VPI 1/0 ILMI 0

VCI Type Encaps SC 16 PVC ILMI UBR 7 0 PVC-D SNAP UBR

Peak Avg/Min Burst Kbps Kbps Cells Sts 155000 UP

155000 UP

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.1.2, timeout is 2 seconds: iiiii

Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms

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