Operation Manual – DHCPH3C S3100 Series Ethernet Switches Chapter 1 DHCP Overview1-4z hops: Number of DHCP relay agents which a DHCP packet passes. For eachDHCP relay agent that the DHCP request packet passes, the field value increasesby 1.z xid: Random number that the client selects when it initiates a request. The numberis 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 DHCPresponse packet is a unicast (set to 0) or broadcast (set to 1). Other bits arereserved.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 afterit 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 forthe DHCP client.z option: Optional variable-length fields, including packet type, valid lease time, IPaddress of a DNS server, and IP address of the WINS server.1.4 Protocol SpecificationProtocol specifications related to DHCP include:z RFC2131: Dynamic Host Configuration Protocolz RFC2132: DHCP Options and BOOTP Vendor Extensionsz RFC1542: Clarifications and Extensions for the Bootstrap Protocolz RFC3046: DHCP Relay Agent Information option
