Operation Manual – DHCP
H3C S3100 Series Ethernet Switches Chapter 1 DHCP Overview
1-4
z hops: Number of DHCP relay agents which a DHCP packet passes. For each
DHCP relay agent that the DHCP request packet passes, the field value increases
by 1.
z xid: Random number that the client selects when it initiates a request. The number
is used to identify an address-requesting process.
z secs: Elapsed time after the DHCP client initiates a DHCP request.
z flags: The first bit is the broadcast response flag bit, used to identify that the DHCP
response packet is a unicast (set to 0) or broadcast (set to 1). Other bits are
reserved.
z ciaddr: IP address of a DHCP client.
z yiaddr: IP address that the DHCP server assigns to a client.
z siaddr: IP address of the DHCP server.
z giaddr: IP address of the first DHCP relay agent that the DHCP client passes after
it sent the request packet.
z chaddr: Hardware address of the DHCP client.
z sname: Name of the DHCP server.
z file: Path and name of the boot configuration file that the DHCP server specifies for
the DHCP client.
z option: Optional variable-length fields, including packet type, valid lease time, IP
address of a DNS server, and IP address of the WINS server.
1.4 Protocol Specification
Protocol specifications related to DHCP include:
z RFC2131: Dynamic Host Configuration Protocol
z RFC2132: DHCP Options and BOOTP Vendor Extensions
z RFC1542: Clarifications and Extensions for the Bootstrap Protocol
z RFC3046: DHCP Relay Agent Information option
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