Avaya BCM50 Konfigurationsanleitung PDF herunterladen (Seite 474)

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474 Chapter 64 VLAN overview

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Specifying the site-specific options for VLAN

The BCM DHCP server resides in the default VLAN and is configured to supply the VLAN

information to the IP phones. The DHCP server supplies site-specific options in the DHCP offer

message.

The following definition describes the Nortel IP Phone 2004-specific, site-specific option. This

option uses the reserved for site specific use DHCP options (DHCP option values 128 to 254) and

must be returned by the DHCP server as part of each DHCP OFFER and ACK message for the

IP Phone 2004 to accept these messages as valid. The IP Phone 2004 pulls the relevant

information out of this option and uses it to configure the IP phone.

Format of field is: Type, Length, Data.

Type (1 octet):

• Five choices 0x80, 0x90, 0x9d, 0xbf, 0xfb (128, 144, 157, 191, 251).

• Providing a choice of five types allows the IP Phone 2004 to work in environments where the

initial choice may already be in use by a different vendor. Select only one TYPE byte.

Length (1 octet): (variable depends on the message content)

Data (length octets):

• ASCII based

• format: VLAN-A:XXX,YYY.ZZZ.

where VLAN-A: uniquely identifies this as the Nortel DHCP VLAN discovery.

— -A signifies this version of this spec. Future enhancements could use -B, for example.

— ASCII , (comma) is used to separate fields.

— ASCII . (period) is used to signal end of structure.

— XXX, YYY and ZZZ are ASCII-encoded decimal numbers with a range of 0-4095. The

number is used to identify the VLAN Ids. A maximum of 10 VLAN Ids can be configured.

NONE means no VLAN (default VLAN).

The DHCP Offer message carrying VLAN information has no VLAN tag when it is sent out from

the DHCP server. However, a VLAN tag is added to the packet at the switch port. The packets are

untagged at the port of the IP phone.

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