Dhcp Server Access - Dell PowerConnect J-EX4200-24T Software Manual

DHCP Server Access

Figure 60: DHCP Snooping
For general information about the messages that the DHCP client and DHCP server
exchange during the assignment of an IP address for the client, see the Junos OS System
Basics Configuration Guide at
Switch access to the DHCP server can be configured in three ways:
Switch, DHCP Clients, and DHCP Server Are All on the Same VLAN on page 2551
Switch Acts as DHCP Server on page 2553
Switch Acts as Relay Agent on page 2553
Switch, DHCP Clients, and DHCP Server Are All on the Same VLAN
When the switch, DHCP clients, and DHCP server are all members of the same VLAN,
the DHCP server can be connected to the switch in one of two ways:
The server is directly connected to the same switch as the one connected to the DHCP
clients (the hosts, or network devices, that are requesting IP addresses from the server).
You must configure the port that connects the server to the switch as a trusted port.
See Figure 61 on page 2552.
The server is directly connected to a switch that is itself directly connected through a
trunk port to the switch that the DHCP clients are connected to. The trunk port is
configured by default as a trusted port. The switch that the DHCP server is connected
http://www.juniper.net/techpubs/software/junos/
Chapter 93: Port Security Overview
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