Users Guide

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 Operation with Other Features
The DHCP client operates with other Dell Networking OS features, as the following describes.
Stacking
The DHCP client daemon runs only on the master unit and handles all DHCP packet transactions. It
periodically synchronizes the lease file with the standby unit.
When a stack failover occurs, the new master requires the same DHCP server-assigned IP address on DHCP
client interfaces. The new master reinitiates a DHCP packet transaction by sending a DHCP discovery packet
on nonbound interfaces.
Virtual Link Trunking (VLT)
A DHCP client is not supported on VLT interfaces.
Dynamic Host Configuration Protocol (DHCP) 317