Obtaining an IP address using DHCP

Use DHCP to obtain an IPv4 address for your Management VLAN or a client on that VLAN. The following examples illustrate when an IP address will be received from the DHCP server.

DHCP server on a Management VLAN

If Blue_VLAN is configured as the Management VLAN and the DHCP server is also on Blue_VLAN, Blue_VLAN receives an IP address. Because DHCP Relay does not forward onto or off the Management VLAN, devices on Red_VLAN cannot get an IP address from the DHCP server on Blue_VLAN (Management VLAN) and Red_VLAN does not receive an IP address.

DHCP server on a different VLAN from the Management VLAN

If Red_VLAN is configured as the Management VLAN and the DHCP server is on Blue_VLAN, Blue_VLAN receives an IP address but Red_VLAN does not.

No Management VLANs configured

If no Management VLAN is configured, both Blue_VLAN and Red_VLAN receive IP addresses.

A client on a different Management VLAN from the DHCP server

If Red_VLAN is configured as the Management VLAN and the client is on Red_VLAN, but the DHCP server is on Blue_VLAN, the client will not receive an IP address.

A DHCP server and client on the Management VLAN

If Blue_VLAN is configured as the Management VLAN, the client is on Blue_VLAN, and the DHCP server is on Blue_VLAN, the client receives an IP address.