Switch And Clients Are On Same Vlan As Dhcp Server; Switch Acts As Relay Agent - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

Complete Software Guide for Junos
Configurations of the EX Series Switch That Support Option 82
3066
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OS for EX Series Ethernet Switches, Release 10.4
remote ID—Identifies the host. By default, the remote ID is the MAC address of the
switch. You can specify that the remote ID be the hostname of the switch, the interface
description, or a character string of your choice. You can also add an optional prefix to
the remote ID.
vendor ID—Identifies the vendor of the host. If you specify the
not enter a value, the default value
character string.
Configurations of the EX Series switch that support option 82 are:
Switch and Clients Are on Same VLAN as DHCP Server on page 3066
Switch Acts as Relay Agent on page 3066

Switch and Clients Are on Same VLAN as DHCP Server

If the DHCP clients, the switch, and the DHCP server are all on the same VLAN, the switch
forwards the requests from the clients on untrusted access interfaces to the server on a
trusted interface. See Figure 73 on page 3066.
Figure 73: DHCP Clients, Switch, and DHCP Server Are All on Same VLAN
For the configuration shown in Figure 73 on page 3066, you set DHCP option 82 at the
ethernet-switching-options secure-access-port vlan]

Switch Acts as Relay Agent

The switch functions as a relay agent when the DHCP clients or the DHCP server is
connected to the switch through a Layer 3 interface. On the switch, these interfaces are
configured as routed VLAN interfaces, or RVIs. Figure 74 on page 3067 illustrates a scenario
Juniper is used. To specify a value, you type a
hierarchy level.
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option but do
vendor-id
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