Rate Of Dhcp Client Packets Processed By Dhcp Relay Overview; Manually Configuring The Maximum Rate Of Client Packets Processed Per Second By Dhcp Relay - Juniper JUNOSE SOFTWARE 11.2.X - BROADBAND ACCESS CONFIGURATION GUIDE 7-20-2010 Configuration Manual

JunosE 11.2.x Broadband Access Configuration Guide

Rate of DHCP Client Packets Processed by DHCP Relay Overview

Manually Configuring the Maximum Rate of Client Packets Processed Per Second by DHCP
Relay
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set dhcp relay agent
set dhcp relay agent sub-option
set dhcp relay assign-giaddr-source-ip
set dhcp relay broadcast-flag-replies
set dhcp relay giaddr-selects-interface
set dhcp relay layer2-unicast-replies
set dhcp relay options
set dhcp relay override
set dhcp relay preserve-trusted-client-option
set dhcp relay trust-all
set dhcp vendor-option
In instances when multiple IP clients send a large number of packets, DHCP relay is kept
busy processing client packets. While DHCP relay processes client packets, it does not
process the packets returned from DHCP server at the same rate. This causes a drop in
the number of successful transactions between the remote clients and DHCP server.
You can avoid this situation by limiting the number of client packets that DHCP relay
processes and assigning a higher priority to packets that DHCP server sends. While DHCP
relay monitors the load on the uplink line module, it calculates the number of client
packets it can process for the next second. This calculation enables DHCP relay to handle
only that number of client packets and process all the packets as calculated. DHCP relay
continues to monitor the uplink line module and sets a new rate for packets processed
every second. DHCP assigns higher priority to server packets so, when processing an
excessive number of packets, DHCP relay discards the client packets first.
DHCP relay monitors the load on the interface controller (IC). In some cases, when
packets are discarded before they reach the IC, the DHCP relay cannot set the maximum
client packet rate automatically. You can then manually reconfigure the rate at which
DHCP relay processes client packets per second. Manual reconfiguration of the maximum
client packet rate is necessary in cases such as the following:
When DHCP relay forwards a large number of client packets, DHCP server might not
be able to process all of them. DHCP server discards the excess packets. You can set
the maximum rate of client packets based on the server capability.
When the uplink line module cannot handle heavy loads, packets are discarded before
they reach the IC. You can set the maximum rate of client packets based on the uplink
load capacity.
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