Nortel Networks 4050 manual Overview

44Chapter 1 Overview

For each VLAN:

aCreate a DHCP scope.

bSpecify the IP address range and subnet mask for that scope.

cConfigure 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.

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.

3Configure 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.

Note: The uplink ports must participate in all the VLANs.

cConfigure IP addresses for the VLANs.

These IP interfaces are the default gateways the DHCP Relay will use.

dIf the edge switches are operating in Layer 2 mode, configure DHCP relay agents for the Red, Yellow, Green, and VoIP VLANs.

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