Static Virtual LANs (VLANs)

Special VLAN Types

Using DHCP to Obtain an IP Address

You can 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.

1.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 of 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. See figure 2-32.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Blue_VLAN is Management VLAN - receives IP

 

 

 

 

 

 

 

 

 

 

 

 

 

DHCP

 

 

 

 

 

 

 

address

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Server

 

 

 

 

 

 

 

Red_VLAN does not receive IP address

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Red_VLAN

Blue_VLAN is Management VLAN

Figure 2-32. Example of DHCP Server on Management VLAN

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