3com 2500 User Guide
10-2
C
HAPTER
10: A
DMINISTERING
IP R
OUTING
Administering
Interfaces
Interfaces
You can define two types of IP interfaces through CoreBuilder 2500
Extended Switching software: IP VLAN interfaces and IP LIS interfaces.
This section describes these interfaces and how to administer them.
Extended Switching software: IP VLAN interfaces and IP LIS interfaces.
This section describes these interfaces and how to administer them.
IP VLAN Interfaces
An IP VLAN interface defines the relationship between an IP virtual LAN
(VLAN) and the subnets in the IP network. Every IP VLAN interface has
one IP VLAN associated with it. Each Ethernet and FDDI module has one
interface defined for each subnetwork that is directly connected to it.
(VLAN) and the subnets in the IP network. Every IP VLAN interface has
one IP VLAN associated with it. Each Ethernet and FDDI module has one
interface defined for each subnetwork that is directly connected to it.
You must first define a VLAN, as described in Chapter 9, Administering
VLANs, before you define an associated IP VLAN interface.
VLANs, before you define an associated IP VLAN interface.
IP LIS Interfaces
A logical IP subnet (LIS) interface supports classical IP over ATM. You
define LIS interfaces only for the ports on ATM modules. See Chapter 11
of the CoreBuilder 2500 Operation Guide for more information about the
ATM protocol. See the CoreBuilder 2500 Administration Console User
Guide for information about how to configure ATM ports.
define LIS interfaces only for the ports on ATM modules. See Chapter 11
of the CoreBuilder 2500 Operation Guide for more information about the
ATM protocol. See the CoreBuilder 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 — The address specific to your network. Choose an IP
address from the range of addresses assigned to your organization.
This address defines both the number of the network to which the
interface is attached and its host number on that network.
address from the range of addresses assigned to your organization.
This address defines both the number of the network to which the
interface is attached and its host number on that network.
■
Subnet Mask — A 32-bit number that uses the same format and
representation as an IP address. The subnet mask determines the bits
in the IP address that are interpreted as the network number, the
subnetwork number, and the host number. Each IP address bit that
corresponds to a 1 in the subnet mask is in the network/subnetwork
part of the address. Each IP address bit that corresponds to a 0 is in
the host part of the IP address.
representation as an IP address. The subnet mask determines the bits
in the IP address that are interpreted as the network number, the
subnetwork number, and the host number. Each IP address bit that
corresponds to a 1 in the subnet mask is in the network/subnetwork
part of the address. Each IP address bit that corresponds to a 0 is in
the host part of the IP address.
■
Type — VLAN, which supports routing between two VLANs, or LIS,
which supports classical IP over ATM
which supports classical IP over ATM
■
State — This status of the IP interface indicates whether the interface
is available for communications.
is available for communications.
■
VLAN index number — When you select
vlan
as the interface type,
the system prompts you for the VLAN index number, which indicates
which bridge ports are associated with the IP interface. The system
prompt includes a list of available VLAN indexes and the bridge ports
associated with them.
which bridge ports are associated with the IP interface. The system
prompt includes a list of available VLAN indexes and the bridge ports
associated with them.