Delta DVS-328 series, Руководство пользователя

Страница: 40 / 246

C h a p t e r 3 F e a t u r e d F u n c t i o n s
3 - 1 9

DHCP Relay Statistics
DHCP Relay Statistics
Item Description
No of Packets inserted
Circuit-Id option
The number of packets which inserted the circuit-Id option.
No of Packets inserted
Remote-Id suboption
The number of packets which inserted the remote-Id suboption.
No of Packets dropped The number of packets which dropped.
No of Packets which did
not inserted RAI option The number of packets which did not insert the RAI (Relay Agent
Information) option.
3.1.5.3 DHCP L2 Relay
In some networks, DHCP servers rely on the Relay Agent Information option appended by Relay Agents for the
IP address and other parameter assignment policies. This works fine when end hosts are directly connected to
Relay Agents. In some network configurations, one or more Layer 2 devices may reside between DHCP clients
and a Relay agent. In these network scenarios, it is difficult to use the Relay Agent Information option for an IP
address and other parameter assignment policies effectively. So there is a requirement for the device that is
closest to the end hosts to append a Relay Agent Information option in DHCP messages. These devices are
typically known as Layer 2 Relay Agents. The operating theory is shown in the figure below.