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C-1

Appendix C

Conﬁguring Classical IP over ATM

RFC 1577, “Classical IP and ARP over ATM,” is a speciﬁcation for an

administrative entity within an ATM network called a logical IP subnet (LIS). Bay

Networks supports RFC 1577.

Each ATM LIS consists of multiple network devices — hosts and routers —

connected to the ATM network and conﬁgured with interfaces to the same IP

subnetwork. Each LIS operates and communicates independently of other LISs in

the ATM network. A host connected to an ATM network communicates directly

with other hosts in its own LIS. To communicate with hosts in other LISs, the host

must use an IP router. A router can be connected to multiple LISs.

An ATM LIS must meet the following requirements as described in RFC 1577:

• All members of the LIS (hosts and routers) must have the same IP network/

subnet number and address mask.

• All members must be directly connected to the ATM network, using switched

virtual circuits (SVCs).

• All members must access hosts outside the LIS through a router.

• All members must be able to communicate by means of ATM with every other

member of the LIS (that is, the virtual connection topology must be fully

meshed).

An ATM LIS can replace an IP LAN. In Figure C-1, for example, three IP host

systems and an IP router have interfaces to an Ethernet LAN. To communicate

with each other on the LAN, the devices use the media access control (MAC)

addresses of the LAN that they obtain via ARP or by static conﬁguration. For

communications beyond the LAN, the devices use IP addresses.

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