Further Information On Option 43 (Dhcp Support) - Siemens optiPoint 410 S Administrator's Manual

xml_02.fm
XML Configuration Management
Installation
2.4.1.1

Further Information on Option 43 (DHCP Support)

As there is no DHCP option for exchanging VLAN information via DHCP, the "Vendor Specific
Information" option (43) is used to encapsulate VLAN and download information.
ing diagram illustrates the format of the "Vendor Specific" option.
Byte # 0 1 2 3
Description
Value 43 20 1 10 'S' 'i'
Byte 1 contains tag "43", "Option 1 data" contains the "Siemens" identifier. The "VLAN ID" is
contained in "Option 2". Five padding bytes (starting at byte 20) and the "Terminate Option 255"
tag in byte 25 complete the option frame.
You must enter the server values if you have to specify a configuration download server for the
configuration update. You can enter the new option before or after the VLAN information but
the five padding bytes (value 0) and the "Terminate Option 255" tag must close the option
frame.
Example:
Code: 3
Length: 21
File: ftp://ftp.siemens.com (or https://www.siemens.com, for example)
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
Option 1 data - "ftp server address"
3 21 'f' 't' 'p' ':'
The five padding bytes and the "Terminate Option 255" tag now complete the option frame in
byte 48.
1. Data is transferred from the application layer to the transport layer, where it is assigned a TPC or UDP header
and split into datagrams. The transport layer forwards the datagrams to the network layer which divides them
into packets and assigns them headers.
2-8
4 5 6 7 8 9
Option 1 data - "Siemens" identifier
'e' 'm' 'e' 'n'
'/' '/' 'f' 't' 'p' '.' 's' 'i'
10 11 12 13 14 15 16 17 18 19 20
Option 2 data - to
be allocated VID
's' 0 0 0 2 4 0
36 37 38
'e' 'm' 'e' 'n' 's'
A31003-2056-X619-1-76A9, March 25 2006
XML Configuration Management, Administration manual
21 22
0 0 0 0
39 40 41 42 43 44 45
'.' 'c' 'o' 'm' 0 0 0
1
The follow-
23 24 25
0 0 255
46 47 48
0 0 255