Switching Device Configurations That Support Option 82
Switching device configurations that support option 82 are:
•
Switching Device, DHCP Clients, and the DHCP Server Are on the Same VLAN or Bridge
Domain on page 394
•
Switching Device Acts as a Relay Agent on page 394
Switching Device, DHCP Clients, and the DHCP Server Are on the Same VLAN or
Bridge Domain
If the switching device, the DHCP clients, and the DHCP server are all on the same VLAN
or bridge domain, the switching device forwards the requests from the clients on untrusted
access interfaces to the server on a trusted interface. See Figure 22 on page 394.
Figure 22: DHCP Clients, Switching Device, and the DHCP Server Are All
on the Same VLAN or Bridge Domain
Switching Device Acts as a Relay Agent
The switching device functions as a relay agent (extended relay server) when the DHCP
clients or the DHCP server is connected to the switching device through a Layer 3 interface.
On the switching device, these interfaces are configured as routed VLAN interfaces (RVIs).
Figure 23 on page 395 illustrates a scenario for the switching device acting as an extended
relay server; in this instance, the switching device relays requests to the server. This figure
shows the relay agent and server on the same network, but they can also be on different
networks–that is, the relay agent can be external.
Copyright © 2017, Juniper Networks, Inc.394
ACX Series Universal Access Router Configuration Guide
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