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Configuring IP IP Forwarding

OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006 page 12-7

Configuring an IP Router Interface

IP is enabled by default. Using IP, devices connected to ports on the same VLAN are able to communi-

cate. However, to forward packets to a different VLAN, you must create at least one router interface on

each VLAN.

Use the ip interface command to define up to eight IP interfaces for an existing VLAN. The following

parameter values are configured with this command:

• A unique interface name (text string up to 20 characters) is used to identify the IP interface. Specify-

ing this parameter is required to create or modify an IP interface.

• The VLAN ID of an existing VLAN.

• An IP address to assign to the router interface (e.g., 193.204.173.21). Note that router interface IP

addresses must be unique. You cannot have two router interfaces with the same IP address.

• A subnet mask (defaults to the IP address class).

• The forwarding status for the interface (defaults to forwarding). A forwarding router interface sends IP

frames to other subnets. A router interface that is not forwarding can receive frames from other hosts

on the same subnet.

• An Ethernet-II or SNAP encapsulation for the interface (defaults to Ethernet-II). The encapsulation

determines the framing type the interface uses when generating frames that are forwarded out of

VLAN ports. Select an encapsulation that matches the encapsulation of the majority of VLAN traffic.

• The Local Proxy ARP status for the VLAN. If enabled, traffic within the VLAN is routed instead of

bridged. ARP requests return the MAC address of the IP router interface defined for the VLAN. For

more information about Local Proxy ARP, see “Local Proxy ARP” on page 12-12.

• The primary interface status. Designates the specified IP interface as the primary interface for the

VLAN. By default, the first interface bound to a VLAN becomes the primary interface for that VLAN.

The following ip interface command example creates an IP interface named Marketing with an IP

network address of 21.0.0.1 and binds the interface to VLAN 455:

-> ip interface Marketing address 21.0.0.1 vlan 455

Note. The ip interface command is not supported in Release 5.3.1. For this release use the vlan router ip

command instead. See the OmniSwitch CLI Reference Guide for more information.

The name parameter is the only parameter required with this command. Specifying additional parameters

is only necessary to configure a value other than the default value for that parameter. For example, both of

the following commands will create an IP router interface for VLAN 955 with a class A subnet mask, an

enabled forwarding status, Ethernet-II encapsulation, and a disabled Local Proxy ARP and primary inter-

face status:

-> ip interface Accounting address 71.0.0.1 mask 255.0.0.0 vlan 955 forward e2

no local-proxy-arp no primary

-> ip interface Accounting address 71.0.0.1 vlan 955

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