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9-2 CHAPTER 9: ADMINISTERING IP ROUTING
LIS Interfaces A logical IP subnet (LIS) interface supports logical IP over ATM. You define
LIS interfaces for the ports on ATM modules only. See the Chapter 11 of the
LANplex® 2500 Operation Guide for more information about the ATM
protocol. See the LANplex® 2500 Administration Console User Guide for
information about how to configure ATM ports.
Interface
Characteristics
Each IP interface has the following information associated with it:
■ IP Address — This address, which is specific to your network, should be
chosen from the range of addresses assigned to your organization by the
central agency. This address defines both the number of the network to
which the interface is attached and the interface’s host number on that
network.
■ Subnet Mask — A subnet mask is a 32-bit number that uses the same
format and representation as IP addresses. The subnet mask determines
which bits in the IP address are interpreted as the network number, the
subnet number, and the host number. Each IP address bit corresponding to
a 1 in the subnet mask is in the network/subnet part of the address. Each IP
address bit corresponding to a 0 is in the host part of the IP address.
■ Advertisement Address — The switching module uses this IP address
when it advertises routes to other stations on the same subnet. In particular,
the system uses this address for sending RIP updates. By default the
switching module uses a directed advertisement (all 1s in the host field).
■ Cost — This number, between 1 and 15, is used when calculating route
metrics. Unless your network has special requirements, assign a cost of 1 to
all interfaces.
■ Type — The IP interface is one of these types:
■ VLAN, which supports routing between two VLANs
■ LIS, which supports classical IP over ATM
■ State — This status of the IP interface indicates whether the interface is
available for communications.
■ VLAN Interface — When you select VLAN as the interface type, the
Administration Console prompts you for the VLAN index number. The VLAN
index number indicates which bridge ports are associated with the IP
interface. When the LANplex Administration Console menu prompts you for