Dhcp Troubleshooting - Huawei Quidway S3500 Series Operation Manual

Operation Manual - Network Protocol
Quidway S3500 Series Ethernet Switches
# Assign to VLAN interface 2 an IP address in the same network segment where the
DHCP clients reside.
[Quidway-Vlan-interface2] ip address 10.110.1.1 255.255.0.0
# Configure on VLAN interface 2 the DHCP server address to which DHCP messages
are to be relayed.
[Quidway-Vlan-interface2] ip relay-address 202.38.1.2
To enable the DHCP clients to obtain IP addresses from the DHCP server, you still need
to make more configurations on the DHCP server. These configurations vary by DHCP
server device and are beyond the scope of this manual.

5.7 DHCP Troubleshooting

I. DHCP server
Fault: Dynamic IP address conflict presented at a client.
Troubleshooting:
Check for the host using the IP address by pinging the address at relatively long
intervals for several times;
If such a host exists, forbid the IP address in automatic allocation by using the
dhcp server forbidden-ip command.
At the client, you can release the current dynamic IP address by executing the
ipconfig/release_all command in DOS or [winipcfg/Release] in GUI, and then request
a new one by executing the ipconfig/renew_all command or [winipcfg/Update].
II. DHCP relay
Fault: DHCP clients could not obtain configuration information.
Troubleshooting:
Check that:
An address pool with the network segment where DHCP clients reside is available
on the DHCP server;
Routes are available on both the DHCP Relay-enabled network device (switch for
example) and the DHCP server for them to reach each other.
The correct IP relay address is configured on the VLAN interface connected to the
network segment where the DHCP clients reside and no conflict presents due to
the existence of multiple IP relay addresses.
Huawei Technologies Proprietary
5-27
Chapter 5 DHCP Configuration