DHCP Principles
Page 934 7210 SAS-X OS Services Guide
DHCP Principles
NOTE: DHCP relay is supported on 7210 SAS-R6 devices.
In a Triple Play network, client devices (such as a routed home gateway, a session initiation
protocol (SIP) phone or a set-top box) use Dynamic Host Configuration Protocol (DHCP) to
dynamically obtain their IP address and other network configuration information. 7210 autoinit
procedure also uses DHCP to dynamically obtain the BOF file used for first-time booting of the
system (along with IP address required to retrieve the BOF file, the configuration file and the
Timos software image from the network). DHCP is defined and shaped by several RFCs and drafts
in the IETF DHC working group including the following
• RFC 2131, Dynamic Host Configuration Protocol
• RFC 3046, DHCP Relay Agent Information Option
The DHCP operation is illustrated in Figure 59.
Figure 59: IP Address Assignment with DHCP
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