IP Addressing Commands 465
• 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
name list.
Examples
To enable DHCPv4 on vlan 2:
console#config
console(config)#interface vlan 2
console(config-if-vlan2)#ip address dhcp
ip default-gateway
Use the ip default-gateway command in Global Configuration mode to
configure a default gateway (router).
Syntax
ip default-gateway
ip-address
no ip default-gateway
ip-address
Parameter Description
Parameter Description
ip-address Valid IPv4 address of an attached router.
2CSPC4.XModular-SWUM200.book Page 465 Thursday, March 10, 2011 11:18 AM
