
Configuring ATM Services
5-4
Interim Local Management Interface (ILMI)
In a switched ATM network, an ATM device must register its ATM address with
an ATM switch. The router uses ILMI to send and receive initial registration data
to and from an ATM switch. Using a series of ILMI SNMP
set and get
commands, the router
1. Initializes its ATM address table for the interface (the switch also initializes its
address table for the interface).
2. Receives the ATM Address Network Prefix from the switch.
3. Combines this Network Prefix with its own User Part (suffix).
4. Transmits the entire address to the switch.
ARP and Inverse ARP Support
ATM supports address resolution protocol (ARP), enabling the router to
dynamically resolve IP network layer protocol-to-VPI/VCI address mappings.
ATM learns the address of the virtual circuit by detecting the virtual circuit that
delivered the ARP response.
ATM also supports Inverse ARP. However, you can use Inverse ARP only if both
the local and remote router support it.\
Bay Networks uses both proprietary and standard ARP and Inverse ARP for PVCs
that run IP. Which method the PVC uses depends on how you configure the
address resolution parameter for the IP interface. Refer to Configuring IP Services
for additional information about the IP address resolution parameter.
Bay Networks uses standard ARP and Inverse ARP for SVCs running classical IP
(RFC 1577) and SVCs running LAN emulation.
LAN Emulation
Today’s networks consist of a vast amount of existing LAN application software.
LAN emulation provides a way to accommodate this software while taking
advantage of ATM technology. In other words, LAN emulation allows the router
to connect to the ATM network while LAN application software continues to
operate as if it were running on a traditional LAN.
For additional information on LAN emulation, refer to Appendix B.
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