Dell PowerEdge FX2/FX2s - Manual (Page 64)

address remains in the running configuration for the interface. To acquire a new IP address, enter either
the renew dhcp command at the EXEC privilege level or the ip address dhcp command at the
interface configuration level.
If you enter renew dhcp command on an interface already configured with a dynamic IP address, the
lease time of the dynamically acquired IP address is renewed.
Important: To verify the currently configured dynamic IP address on an interface, enter the show
ip dhcp lease command. The show running-configuration command output only displays
ip address dhcp; the currently assigned dynamic IP address is not displayed.
DHCP Client on a Management Interface
These conditions apply when you enable a management interface to operate as a DHCP client.
• The management default route is added with the gateway as the router IP address received in the
DHCP ACK packet. It is required to send and receive traffic to and from other subnets on the external
network. The route is added irrespective when the DHCP client and server are in the same or different
subnets. The management default route is deleted if the management IP address is released like other
DHCP client management routes.
• ip route for 0.0.0.0 takes precedence if it is present or added later.
• Management routes added by a DHCP client display with Route Source as DHCP in the show ip
management route and show ip management-route dynamic command output.
• Management routes added by DHCP are automatically reinstalled if you configure a static IP route
with the ip route command that replaces a management route added by the DHCP client. If you
remove the statically configured IP route using the no ip route command, the management route
is reinstalled. Manually delete management routes added by the DHCP client.
• To reinstall management routes added by the DHCP client that is removed or replaced by the same
statically configured management routes, release the DHCP IP address and renew it on the
management interface.
• Management routes added by the DHCP client have higher precedence over the same statically
configured management route. Static routes are not removed from the running configuration if a
dynamically acquired management route added by the DHCP client overwrites a static management
route.
• Management routes added by the DHCP client are not added to the running configuration.
NOTE: Management routes added by the DHCP client include the specific routes to reach a DHCP
server in a different subnet and the management route.
DHCP Client on a VLAN
The following conditions apply on a VLAN that operates as a DHCP client:
• The default VLAN 1 with all ports auto-configured as members is the only L3 interface on the
Aggregator.
• When the default management VLAN has a DHCP-assigned address and you reconfigure the default
VLAN ID number, the Aggregator:
– Sends a DHCP release to the DHCP server to release the IP address.
– Sends a DHCP request to obtain a new IP address. The IP address assigned by the DHCP server is
used for the new default management VLAN.
64 Dynamic Host Configuration Protocol (DHCP)