The command no ip address removes the interface's primary address only
if configured through DHCP and sets the interface method to None. It
does not remove a manually configured address.
In addition to leasing an IP address and subnet mask, the DHCP client may
learn the following parameters from a DHCP server:
The IPv4 address of a default gateway. If the device learns different default
gateways on different interfaces, the system uses the first default gateway
learned. The system installs a default route in the routing table, with the
default gateway's address as the next hop address. This default route has a
preference of 254.
The IPv4 address of a DNS server. The DNS client stores each DNS server
address in its server list.
A domain name. The DNS client stores each domain name in its domain
To enable DHCPv4 on vlan 2:
console(config)#interface vlan 2
console(config-if-vlan2)#ip address dhcp
Use the ip default-gateway command in Global Configuration mode to
configure a default gateway (router).
no ip default-gateway
Valid IPv4 address of an attached router.
IP Addressing Commands