Intel 480T, User Manual

Page: 179 / 367

C H A P T E R 1 0 IP Unicast Routing
177
Figure 19: VLAN aggregation
In Figure 19, all stations are configured to use the address 10.3.2.1
for the default router.
VLAN Aggregation Properties
VLAN aggregation is a very specific application, and the following
properties apply to its operation:
• All broadcast and unknown traffic remains local to the sub-VLAN
and does not cross the sub-VLAN boundary. All traffic within the
sub-VLAN is switched by the sub-VLAN, allowing traffic
separation between sub-VLANs (while using the same default
router address among the sub-VLANs).
• Hosts are located on the sub-VLAN. Each host can assume any IP
address within the address range of the super-VLAN router
interface. Hosts on the sub-VLAN are expected to have the same
network mask as the super-VLAN, and have their default router
set to the IP address or the super-VLAN.
480t_023
Sub-VLAN 1 Sub-VLAN 2 Sub-VLAN 3 Sub-VLAN n
Super VLAN_1
IP address: a.b.c.1
mask: /24
Sub-VLAN 1 Sub-VLAN 2 Sub-VLAN 3 Sub-VLAN n
Super VLAN_2
IP address: a.b.d.1
mask: /24
Sub-VLAN 1 Sub-VLAN 2 Sub-VLAN 3 Sub-VLAN n
Super VLAN_3
IP address: a.b.e.1
mask: /24
OSPF Rtr_Link
VLAN_A
OSPF Rtr_Link
VLAN_B