Ip Forwarding - Alcatel-Lucent OmniSwitch 6800 Series Network Configuration Manual

Hide thumbs Also See for OmniSwitch 6800 Series:

Table of Contents

Configuring IP

IP Forwarding

Network device traffic is bridged (switched) at the Layer 2 level between ports that are assigned to the

same VLAN. However, if a device needs to communicate with another device that belongs to a different

VLAN, then Layer 3 routing is necessary to transmit traffic between the VLANs. Bridging makes the

decision on where to forward packets based on the packet's destination MAC address; routing makes the

decision on where to forward packets based on the packet's IP network address (e.g., IP - 21.0.0.10).

Alcatel-Lucent switches support routing of IP traffic. A VLAN is available for routing when at least one

router interface is defined for that VLAN and at least one active port is associated with the VLAN. If a

VLAN does not have a router interface, the ports associated with that VLAN are in essence firewalled

from other VLANs.

IP multinetting is also supported. A network is said to be multinetted when multiple IP subnets are brought

together within a single broadcast domain. It is now possible to configure up to eight IP interfaces per

VLAN. Each interface is configured with a different subnet. As a result, traffic from each configured

subnet can coexist on the same VLAN.

In the illustration below, an IP router interface has been configured on each VLAN. Therefore, worksta-

tions connected to ports on VLAN 1 on Switch 1 can communicate with VLAN 2; and workstations

connected to ports on VLAN 3 on Switch 2 can communicate with VLAN 2. Also, ports from both

switches have been assigned to VLAN 2, and a physical connection has been made between the switches.

Therefore, workstations connected to VLAN 1 on Switch 1 can communicate with workstations connected

to VLAN 3 on Switch 2.

If the switch is running in single MAC router mode, a maximum of 4094 VLANs can have IP interfaces

defined and a maximum of 64 VLANs can have IPX interfaces defined. In this mode, each router VLAN

is assigned the same MAC address, which is the base chassis MAC address for the switch.

Chapter 4, "Configuring VLANs,"

OmniSwitch 6800/6850/9000 Network Configuration Guide

IP Router Interface

IP Forwarding

for more information about configuring the IPX router interfaces.

IP Forwarding