124 Configuring and managing IP interfaces and servicesNN47250-500 (320657-F Version 02.01)How WSS software resolves conflicts with statically configured IPparametersWSS Software compares the IP parameter values already configured on the switch with the values receivedfrom 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 fromthe 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 theaddress is not already in use.● If the address is not in use, WSS Software configures the VLAN that has the DHCP clientenabled with the IP address received from the DHCP server. WSS Software thenconfigures the other values as follows:❍ Default router—WSS Software adds a default route for the gateway, with a metric of10.❍ DNS domain name and DNS server IP address—If the default domain name andDNS server IP address are already configured on the switch, and DNS is enabled, theconfigured values are used. Otherwise, the values received from the DHCP server areused.● If the address offered by the DHCP server is already in use, WSS Software sends a DHCPDecline 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 DHCPserver. However, if the IP interface goes down but WSS Software is still running, WSS Software attempts toreuse the address when the interface comes back up.Configuring the DHCP clientTo 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 enablesuccess: 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 ipNote. This command clears all IP configuration information from the interface.
