DHCP functions of S series switches

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DHCP dynamically configures and uniformly manages network parameters of hosts on a TCP/IP network. DHCP provides the following functions:
- Dynamic allocation: DHCP allocates an IP address with a limited validity period (called lease) to a client.
This mechanism applies to hosts that temporarily connect to a network with fewer IP addresses than the total number of hosts and hosts do not need to permanently connect to the network. For example, this mechanism can be used to allocate IP addresses to laptops used by employees on business trips or mobile terminals in cafes.
- Static allocation: Fixed IP addresses are assigned to specified hosts.
This mechanism applies to hosts with special IP address requirements. For example, the file server of an enterprise needs to use a fixed IP address to provide services for extranet users.
Compared with manual IP address configuration, DHCP static allocation prevents manual configuration errors and helps network administrators perform unified maintenance and management.
DHCP can allocate other network parameters except for the IP address to hosts, including the DNS server address, routing information, and gateway address.

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DHCP functions of S series switches
DHCP dynamically configures and uniformly manages network parameters of hosts on a TCP/IP network. DHCP provides the following functions: - Dynamic allocation: DHCP allocates an IP address with a limited validity period (called lease) to a client. This mechanism applies to hosts that temporarily connect to a network with fewer IP addresses than the total number of hosts and hosts do not need to permanently connect to the network. For example, this mechanism can be used to allocate IP addresses to laptops used by employees on business trips or mobile terminals in cafes. - Static allocation: Fixed IP addresses are assigned to specified hosts. This mechanism applies to hosts with special IP address requirements. For example, the file server of an enterprise needs to use a fixed IP address to provide services for extranet users. Compared with manual IP address configuration, DHCP static allocation prevents manual configuration errors and helps network administrators perform unified maintenance and management. DHCP can allocate other network parameters except for the IP address to hosts, including the DNS server address, routing information, and gateway address.

Function of DHCP Request packets on S series switch
For S series switches, DHCP Request messages are sent in the following conditions: - Respond to the DHCP Offer message sent by DHCP servers. - Notify the selected DHCP server using the server identifier option. - Check the allocated network addresses. - Apply for the valid period of addresses. - Extend the existing lease and prolong the lease period.

Functions of the GIADDR field of DHCP messages on S series switches
Functions of the GIADDR field of DHCP messages on S series switches: he GIADDR field (gateway IP address) in DHCP messages records the IP address of the first DHCP relay agent that DHCP messages pass through. After a client sends a DHCP Request message, the first DHCP relay agent fills its own IP address in this field when forwarding this DHCP Request message to the DHCP server if the server and the client are located on different network segments. The DHCP server uses the field to determine the network segment on which a client resides so that the server can assign an IP address on this network segment to the client.

Do S series switches support the DHCP server polling function on a DHCP relay agent
When functioning as a DHCP relay agent, the S series switch excluding the S1700 supports the DHCP server polling function on a DHCP relay agent starting from V100R006C00. By default, the DHCP server polling function on a DHCP relay agent is disabled. You can enable the DHCP server polling function on a DHCP relay agent by configuring ip relay address cycle in the system view.

Support for the DHCP snooping location transition function on S series switch
S series switches (except S1700 switches) in V100R003 and later versions support the DHCP snooping location transition function, which is enabled by default.

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