Huawei Quidway S3000-EI Series User Manual

Operation Manual - Network Protocol
Quidway S3000-EI Series Ethernet Switches Chapter 3
DHCP Client Configuration
Huawei Technologies Proprietary
3-2
z
t
z
P_Request message from the client, the DHCP
Othe
later
DHCP client logs into the network for a second time, its communication with the
he DHCP_Request message containing the IP
z
to indicate
z
r returns the DHCP_NAK message.
3)
Ther P clients. The DHCP server shall
riod expires. If the DHCP client wants to
the IP lease. If the
3.2 DHC
address using DHCP
Select stage, the stage when the client selects the IP address. If several DHCP
servers send DHCP_Offer messages to the client, the client only accepts the firs
received one and then broadcasts DHCP_Request messages respectively to
those DHCP servers. The message contains the information of IP address request
from the selected DHCP server.
Acknowledge stage, the stage when the DHCP server acknowledges the IP
address. When receiving the DHC
server sends the DHCP_ACK message containing the allocated IP address and
other settings back to the client. Then the DHCP client binds its TCP/IP
components to the NIC (network interface card).
r DHCP servers not selected still can allocate their IP addresses to other clients
.
2) DHCP client logs into the network for a second time
When
DHCP server includes these stages:
z When the DHCP client logs into the network at the first time, then at later login the
client only needs to broadcast t
address obtained last time, other than the DHCP_Dsicover message.
After the reception of the DHCP_Request message, the DHCP server returns the
DHCP_ACK message if the requested IP address is still not allocated,
the client to continue use of the IP address.
If the requested IP address becomes unavailable (for example, having been
allocated to another client), the DHCP serve
After receiving the DHCP_NAK message, the client sends the DHCP_Discover
message to request another new IP address.
DHCP client extends its IP lease period
e is time limit for the IP addresses leased to DHC
withdraw the IP addresses when their lease pe
continue use of the old IP address, it has to extend the IP lease.
In practice, the DHCP client, by default, shall originate the DHCP_Request message to
the DHCP server right in the middle of the IP lease period, to update
IP address is still available, the DHCP server responds with the DHCP_ACK message,
notifying the client that it has got the new IP lease.
The DHCP client implemented on the switch supports automatic IP lease update.
P Client Configuration
DHCP client configuration include:
Configuring a VLAN interface to obtain IP

Huawei Quidway S3000-EI Series Specifications

General

Brand	Huawei
Model	Quidway S3000-EI Series
Category	Switch
Language	English