Avaya 1140E User Manual download pdf (Page 62)

62 Conﬁgure the DHCP server

After multiple VLAN IDs are returned from the DHCP server, the IP Phone

1140E tr ies to connect to each of the VLANs, following the order in which

VLAN IDs are speciﬁed in the DHCP option.

The format of the ﬁeld for DHCP VLAN Auto Discovery is: Type, length, and

data, described in the following sections.

Type (1 octet)

To avoid the possibility of option types already being used by different

vendors, there are fourteen options types supported by the telephone. They

are: 128, 131, 144, 157, 188, 191, 205, 219, 223, 232, 247, 251, 247, and

251. Select one value from the type byte list for the DHCPOFFER response.

Nortel recommends using 232, 247, or 251. DHCP option numbers less

than 224 are reclaimed by the IETF (RFC 3942). Future changes in the

DHCP protocol can force the telephone to stop sending these option

requests. Currently, IP Phone 1140E with SIP Firmware does support the

remaining listed options to maintain backward compatibility.

Length (1 octet)

The Length value is variable. Count only the number of octets in the data

ﬁeld.

Data (variable number of octets)

ASCII based format: VLAN-A:XXX+YYY+ZZZ. where, VLAN– A: uniquely

identiﬁes this as the Nortel DHCP VLAN discover y request. Each VLAN ID

is followed by a plus (+) sign if there are more VLAN IDs or a period (.) to

terminate the string.

There are a maximum of 10 VLAN IDs that can be conﬁgured in the current

version.

Once IP Phone 1140E with SIP Firmware receives the DHCP offer

containing the site-speciﬁc Voice VLAN option, the next DHCPDISCOVERY

message is tagged with the Voice VLAN ID.

SIP Fir mware Release 1.1 for IP Phone 1140E Administration

NN43113-300 02.05 Standard

27 May 2008

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Avaya 1140E User Manual Page 62