Dhcp Client Operation With Other Features - Dell C9000 Series Networking Configuration Manual

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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

Management routes added by the DHCP client are not added to the running configuration.

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

A DHCP client also operates with the following software features.

Virtual Link Trunking (VLT)

A DHCP client is not supported on VLT interfaces.

VLAN and Port Channels

DHCP client configuration and behavior are the same on Virtual LAN (VLAN) and port-channel (LAG)

interfaces as on a physical interface.

DHCP Snooping

A DHCP client can run on a switch simultaneously with the DHCP snooping feature as follows:

If you enable DHCP snooping globally on a switch and you enable a DHCP client on an interface, the

trust port, source MAC address, and snooping table validations are not performed on the interface by

DHCP snooping for packets destined to the DHCP client daemon.

The following criteria determine packets destined for the DHCP client:

DHCP is enabled on the interface.

The user data protocol (UDP) destination port in the packet is 68.

The chaddr (change address) in the DHCP header of the packet is the same as the interface's MAC

An entry in the DHCP snooping table is not added for a DHCP client interface.

Dynamic Host Configuration Protocol (DHCP)