User Guide

44 Chapter 1 Overview
320818-A
For each VLAN:
a Create a DHCP scope.
b Specify the IP address range and subnet mask for that scope.
c Configure the following DHCP options:
— Specify the default gateway.
— Specify the DNS server to be used by endpoints in that scope.
— If desired, configure DHCP so that the IP Phones learn their VLAN
configuration data automatically from the DHCP server. For more
information, see Appendix F, “Configuring DHCP to auto-configure
IP Phones,” on page 891.
3 Configure the network core router:
a Create the Red, Yellow, Green, VoIP, and Nortel SNAS 4050 management
VLANs.
b If the edge switches are operating in Layer 2 mode, enable 802.1q tagging
on the uplink ports to enable them to participate in multiple VLANs, then
add the ports to the applicable VLANs.
c Configure IP addresses for the VLANs.
These IP interfaces are the default gateways the DHCP Relay will use.
d If the edge switches are operating in Layer 2 mode, configure DHCP relay
agents for the Red, Yellow, Green, and VoIP VLANs.
Note: For the Red VLANs, the DNS server setting is one of the Nortel
SNAS 4050 portal Virtual IP addresses (pVIP).
While the endpoint is in the Red VLAN, there are limited DNS server
functions to be performed, and the Nortel SNAS 4050 itself acts as the
DNS server. When the endpoint is in one of the other VLANs, DNS
requests are forwarded to the corporate DNS servers.
The DNS server setting is required for the captive portal to work.
Note: The uplink ports must participate in all the VLANs.