multiple relay agents (HP ProCurve 2900 switches) between a client and an Option 82 server

[kerby2000]

Dear all,

I'm trying to configure network with multiple relay agents between a client and an Option 82 server. (I'm using 2 identical switches). See attached picture.

In the documentation on my switch HP ProCurve 2900 it is written
Note: In networks with multiple relay agents between a client and an Option 82 server, append can be used only if the server supports multiple Option 82 fields in a client request. If the server supports only one Option 82 field in a request, consider using the keep option.
http://cdn.procurve.com/training/Manuals/2910-MRG-Sept09-W_14_03.pdf
I'm assuming that my switch supports multiple Option 82 fields.

Can you tel me which DHCP server supports it?
I'm using isc-dhcp-server 4.1.1-P1-15+squeeze2.

Does isc-dhcp-server supports multiple Option 82 fields in one client request?

If this option is supported how should I configure isc-dhcp-server ?

I also found this document:

http://tools.ietf.org/id/draft-ietf-dhc-dhcpv4-relay-encapsulation-00.txt

Does it mean that this option is only planned ?

Kind regards,

Sergey

[kerby2000]

Is anyboby here who can help?

How can I ask this question to HP support?

Could you post their email address?