Avaya IP Line User Manual Page 129

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Features Page 129 of 770
IP Line Description, Installation, and Operation
DHCP requirements
Some implementation requirements of the Automatic VLAN Discovery using
DHCP are:
1 A DHCP server IP address pool must exist for each subnet (also
VLANs). This is standard DHCP operation. The requirement is the same
for PCs or IP Phones.
2 A DHCP server should not exist in more than one VLAN at one time (one
subnet for each VLAN), unless the link to the DHCP server is tagged and
the DHCP server can recognize this. With an untagged link to the DHCP
server, traffic could originate on one VLAN and end up on the other
VLAN. In this case, the VLAN using DHCP feature does not work.
3 Voice and data subnets must be separate if the three-port switch with
VLANs is being used.
4 A Layer three switch (or router) with a relay agent must be used because
traffic from the voice VLAN to the data VLAN must be routed.
Presumably, the DHCP server is on the data VLAN. Without a relay
agent, a DHCP server must exist on each subnet.
5 At least two IP address pools are used on the DHCP server – one for the
Voice VLAN/subnet and another for the Data VLAN/subnet. Additional
pools can be added as required as long as one IP address pool per subnet
and VLAN is used. A relay agent is required if it is a PC-only network.
Control of the IP Phone’s 802.1Q
The 802.1Q header in the outgoing packets from the IP Phones is enabled by
one of the following:
If the IP Phone’s VLAN GUI response is set to 1, then the 802.1Q
functionality is enabled. All packets from the IP Phone have the 802.1Q
header as part of the Ethernet frame.
If the IP Phone’s VLAN GUI response is set to 2, then the 802.1Q
functionality is enabled after the DHCP response is received with the
VLAN ID.
If the OTM or Element Manager configuration enables the use of the “p”
bits, once downloaded to the IP Phone, the 802.1Q functionality is
enabled.
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