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IES-1248-51V User’s Guide
217
CHAPTER 28
DHCP Relay
This chapter shows you how to set up DHCP relays for each VLAN.
28.1 DHCP Relay
DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC 2132) allows
individual clients to obtain TCP/IP configuration at start-up from a DHCP server.
You can configure the IES-1248-51V to relay DHCP requests to one or more DHCP
servers and the server’s responses back to the clients.You can configure the
system to forward client DHCP requests from different VLANs to specific DHCP
servers.
28.2 DHCP Relay Agent Information Option
(Option 82)
The IES-1248-51V can add information to DHCP requests that it relays to a DHCP
server. This helps provide authentication about the source of the requests. You can
also specify additional information for the IES-1248-51V to add to the DHCP
requests that it relays to the DHCP server. Please see RFC 3046 for more details.
The DHCP relay agent information feature adds an Agent Information field to the
option 82 field of the DHCP headers of client TCP/IP configuration request frames
that the IES-1248-51V relays to a DHCP server. The IES-1248-51V supports two
formats for the DHCP relay agent information: Private and TR-101.
28.2.1 Private Format
The DHCP relay agent information feature adds an Agent Information field to the
option 82 field of the DHCP headers of DHCP request frames that the device relays
to a DHCP server. The Agent Information field that the device adds contains an
Agent Circuit-ID sub-option” that includes the slot and port numbers, VLAN ID
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