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VLAN IDs 667

Each VLAN ID is specified as follows

•

The default VLAN ID is 000 (hex).

• The VOICE and Data VLAN IDs can be specified in the manual

configuration user interface.

• Or, in the case of the VOICE VLAN ID, the VOICE VLAN ID can also

be configured by the DHCP parameter when using the Automatic

VLAN discovery using DHCP approach.

Automatic VOICE VLAN ID conﬁguration

As part of the 802.1Q feature, there are two options to automatically

discover the voice VLAN ID: using DHCP and 802.1ab LLDP. This process

reduces the configuration steps since entering data manually (the VOICE

VLAN ID) is not required.

When the Automatic VOICE VLAN Discovery using DHCP approach is

used, and the IP Phone has been configured as such, the following steps

are automatically taken to obtain the VOICE VLAN ID

1. The IP Phones perform an initial DHCP Discovery Request in the

default VLAN.

2. The DHCP server returns a DHCP Ack me ssage with an IP address in

the data VLAN and one or more voice VLAN IDs in the vendor-specific

field.

The IP Phone reads and saves the VOICE VLAN IDs.

The IP Phone rejects the DHCP offer (accepts it but immediately gives

up the lease).

The IP Phone reboots and sends a DHCP Discovery Request with the

first VLAN ID from the saved list. This is repeated for each VLAN ID in

the list until a response is received.

This works because the Layer 2 switch discards every DHCP Discovery

Request it receives from the IP Phone if the VLAN ID does not match the

VLAN IDs configured on the port. When the IP Phone sends a DHCP

Discovery Request with the port configured VLAN ID, the packet passes

into the network and the DHCP server Ack message is passed back.

When a DHCP Ack message is received, the IP Phone accepts the offer

and saves the IP address and Node IP address.

For information on how to implement Automatic VOICE VLAN ID, see

“DHCP Auto Discovery” (page 446) .

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.06 30 April 2010