Nortel Networks WEB OS 212777 - Manual (Page 58)

Web OS 10.0 Application Guide
58 n Chapter 2: VLANs
212777-A, February 2002
VLANs and Default Gateways
Web OS allows you to assign different default gateways for each VLAN. You can effectively
map multiple customers to specific gateways on a single switch. The benefits of segregating
customers to different default gateways are:
n
Resource optimization
n
Enhanced customer segmentation
n
Improved service differentiation
Segregating VLAN Traffic
Deploy this feature in an environment where you want to segregate VLAN traffic to a config-
ured default gateway. In
Figure 2-6 , VLANs 2 and 3 have different routing requirements.
VLAN 2 is required to route traffic through default gateway 5 and VLAN 3 is required to route
traffic through default gateway 6.
Figure 2-6 Default Gateways per VLAN
You can configure 246 default gateways per VLAN with values starting from 5 through 250. If
default gateways per VLAN fail, then traffic is directed to default gateways 1 through 4.
Default gateways 1 through 4 are used for load balancing session requests and as backup when
a specific gateway that has been assigned to a VLAN is down.
nortelnetworks.com
192.168.20.200
yahoo.com
200.1.2.200
Web Switch
VLAN 2 using Gateway 5
172.21.2.1
Internet
VLAN 3 using Gateway 6
172.21.3.1
Gateway 5: 10.10.1.20
Gateway 6: 10.10.1.30
Gateway 1: 10.10.4.1
Router 2
VLAN 4
10.10.1.30
Router 3
VLAN 1
10.10.4.1
IF 1: 10.10.1.1
IF 2: 10.10.4.40
IF 3: 172.21.2.200
IF 4: 172.21.3.200
1
2
3
7
8
Router 1
VLAN 4
10.10.1.20