Quick Steps for Configuring IP Forwarding Configuring IP
page 18-4 OmniSwitch 6800/6850/9000 Network Configuration Guide March 2008
Quick Steps for Configuring IP Forwarding
Using only IP, which is always enabled on the switch, devices connected to ports on the same VLAN are
able to communicate at Layer 2. The initial configuration for all Alcatel-Lucent switches consists of a
default VLAN 1. All switch ports are initially assigned to this VLAN. In addition, when an OmniSwitch
6800/6850 switch is added to a stack of switches or a switching module is added to an OmniSwitch 9000
switch, all ports belonging to the new switch and/or module are also assigned to VLAN 1. If additional
VLANs are not configured on the switch, the entire switch is treated as one large broadcast domain, and
all ports receive all traffic from all other ports.
Note. The operational status of a VLAN remains inactive until at least one active switch port is assigned to
the VLAN. Ports are considered active if they are connected to an active network device. Non-active port
assignments are allowed, but do not change the operational state of the VLAN.
To forward packets to a different VLAN on a switch, you must create a router interface on each VLAN.
The following steps show you how to enable IP forwarding between VLANs “from scratch”. If active
VLANs have already been created on the switch, you only need to create router interfaces on each VLAN
(Steps 5 and 6).
1 Create VLAN 1 with a description (e.g., VLAN 1) by using the vlan command. For example:
-> vlan 1 name “VLAN 1”
2 Create VLAN 2 with a description (e.g., VLAN 2) by using the vlan command. For example:
-> vlan 2 name “VLAN 2”
3 Assign an active port to VLAN 1 by using the vlan port default command. For example, the follow-
ing command assigns port 1 on slot 1 to VLAN 1:
-> vlan 1 port default 1/1
4 Assign an active port to VLAN 2 by using the vlan port default command. For example, the follow-
ing command assigns port 2 on slot 1 to VLAN 2:
-> vlan 2 port default 1/2
5 Create an IP router interface on VLAN 1 using the ip interface command. For example:
-> ip interface vlan-1 address 171.10.1.1 vlan 1
6 Create an IP router interface on VLAN 2 using the ip interface command. For example:
-> ip interface vlan-2 address 171.11.1.1 vlan 2
Note. See Chapter 4, “Configuring VLANs.” for more information about how to create VLANs and
VLAN router interfaces.
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