How Mss Resolves Conflicts With Statically Configured Ip Parameters; Configuring The Dhcp Client - D-Link DWS-1008 - AirPremier MobileLAN Switch Product Manual

How MSS Resolves Conflicts with Statically Configured IP
MSS compares the IP parameter values already configured on the switch with the values received from
the DHCP server, and resolves any conflicts as follows:
• IP address - If the VLAN also has a statically configured IP address, MSS uses an address from
the DHCP server instead of the statically configured address.
MSS sends an ARP for the IP address offered by the DHCP server to verify that the address is not
already in use.
• If the address is not in use, MSS configures the VLAN that has the DHCP client enabled with
the IP address received from the DHCP server. MSS then configures the other values as
follows:
• Default router - MSS adds a default route for the gateway, with a metric of 10.
• DNS domain name and DNS server IP address - If the default domain name and DNS
server IP address are already configured on the switch, and DNS is enabled, the configured
values are used. Otherwise, the values received from the DHCP server are used.
• If the address offered by the DHCP server is already in use, MSS sends a DHCP Decline message
to the server and generates a log message.
• If the address is in a subnet that is already configured on another VLAN on the switch, MSS
sends a DHCP Decline message to the server and generates a log message.
If the switch is powered down or restarted, MSS does not retain the values received from the DHCP
server. However, if the IP interface goes down but MSS is still running, MSS attempts to reuse the
address when the interface comes back up.
To configure the DHCP client on a VLAN, use the following command:
set interface vlan-id ip dhcp-client {enable | disable}
The vlan-id can be the VLAN name or number.
The following command enables the DHCP client on VLAN corpvlan:
DWS-1008# set interface corpvlan ip dhcp-client enable
success: change accepted.
D-Link DWS-1008 User Manual
Parameters

Configuring the DHCP Client