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124 Configuring and managing IP interfaces and services
NN47250-500 (320657-F Version 02.01)
How WSS software resolves conflicts with statically configured IP
parameters
WSS Software 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, WSS Software uses an address from
the DHCP server instead of the statically configured address.
WSS Software 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, WSS Software configures the VLAN that has the DHCP client
enabled with the IP address received from the DHCP server. WSS Software then
configures the other values as follows:
❍ Default router—WSS Software 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, WSS Software 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,
WSS Software sends a DHCP Decline message to the server and generates a log message.
If the switch is powered down or restarted, WSS Software does not retain the values received from the DHCP
server. However, if the IP interface goes down but WSS Software is still running, WSS Software attempts to
reuse the address when the interface comes back up.
Configuring the DHCP client
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:
WSS# set interface corpvlan ip dhcp-client enable
success: change accepted.
You can configure the DHCP client on more than one VLAN, but the client can be active on only one VLAN.
To remove all IP information from a VLAN, including the DHCP client and user-configured DHCP server,
use the following command:
clear interface vlan-id ip
Note. This command clears all IP configuration information from the interface.