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To display whether support for broadcast flag replies is currently on or off on the
router, use the
show dhcp relay
command. For information, see “Monitoring and
Troubleshooting DHCP” on page 539.
To troubleshoot applications that use this feature, you can use the dhcpCapture
system event log category. For information about how to log system events, see
JUNOSe System Event Logging Reference Guide
.
Interaction with Layer 2 Unicast Transmission Method
As described in “Configuring Layer 2 Unicast Transmission Method for Reply Packets
to DHCP Clients” on page 502, you can use the
set dhcp relay layer2-unicast-replies
command to configure DHCP relay and DHCP relay proxy to use the layer 2 unicast
and layer3 broadcast transmission method to send DHCP Offer reply packets and
DHCP ACK and NAK reply packets to clients.
The
set dhcp relay broadcast-flag-replies
command and the
set dhcp relay
layer2-unicast-replies
command are mutually exclusive. If you attempt to issue the
set dhcp relay broadcast-flag-replies
command when the
set dhcp relay
layer2-unicast-replies
command is already in effect, the operation fails and the
router displays the following message:
% layer2-unicast-replies and broadcast-flag-replies are mutually exclusive
If this message appears, you must first issue the
no set dhcp relay
layer2-unicast-replies
command to disable layer 2 unicast replies, and then issue
the
set dhcp relay broadcast-flag-replies
command again to enable broadcast flag
replies.
Table 101 on page 499 summarizes how the configuration of the
set dhcp relay
broadcast-flag-replies
command and the
set dhcp relay layer2-unicast-replies
command interacts with the setting of the broadcast flag in DHCP request packets
to control how the router transmits DHCP reply packets to clients during the discovery
process. Because these commands are mutually exclusive, broadcast flag replies and
layer 2 unicast replies cannot both be enabled on the router at the same time.
Table 101: Router Configuration and Transmission of DHCP Reply Packets
Router Behavior if
Broadcast Flag Not Set
Router Behavior if
Broadcast Flag Set
Layer 2 Unicast
Replies
Broadcast Flag
Replies
DHCP relay and DHCP relay
proxy use layer 2 unicast
and layer 3 unicast
transmission to send DHCP
reply packets to clients.
DHCP relay and DHCP
relay proxy broadcast
DHCP reply packets to
clients.
Disabled (off)
Enabled (on)
DHCP relay and DHCP relay
proxy use layer 2 unicast
and layer 3 broadcast
transmission to send DHCP
reply packets to clients.
DHCP relay and DHCP
relay proxy use layer 2
unicast and layer 3
broadcast transmission to
send DHCP reply packets
to clients.
Enabled (on)
Disabled (off)
Configuring DHCP Relay and BOOTP Relay
■
499
Chapter 20: Configuring DHCP Relay
Summary of Contents for JUNOSE 11.1.X - BROADBAND ACCESS CONFIGURATION GUIDE 6-4-2010
Page 6: ...vi...
Page 28: ...xxviii Table of Contents JUNOSe 11 1 x Broadband Access Configuration Guide...
Page 36: ...xxxvi List of Tables JUNOSe 11 1 x Broadband Access Configuration Guide...
Page 42: ...2 Managing Remote Access JUNOSe 11 1 x Broadband Access Configuration Guide...
Page 210: ...170 Managing RADIUS and TACACS JUNOSe 11 1 x Broadband Access Configuration Guide...
Page 298: ...258 Monitoring RADIUS Relay Server JUNOSe 11 1 x Broadband Access Configuration Guide...
Page 342: ...302 RADIUS Client Terminate Reasons JUNOSe 11 1 x Broadband Access Configuration Guide...
Page 374: ...334 Managing L2TP JUNOSe 11 1 x Broadband Access Configuration Guide...
Page 450: ...410 PPP Accounting Statistics JUNOSe 11 1 x Broadband Access Configuration Guide...
Page 500: ...460 Managing DHCP JUNOSe 11 1 x Broadband Access Configuration Guide...
Page 516: ...476 DHCP Local Server Configuration Tasks JUNOSe 11 1 x Broadband Access Configuration Guide...
Page 562: ...522 Configuring DHCP Relay Proxy JUNOSe 11 1 x Broadband Access Configuration Guide...
Page 622: ...582 Managing the Subscriber Environment JUNOSe 11 1 x Broadband Access Configuration Guide...
Page 680: ...640 Managing Subscriber Services JUNOSe 11 1 x Broadband Access Configuration Guide...
Page 773: ...Part 7 Index Index on page 735 Index 733...
Page 774: ...734 Index JUNOSe 11 1 x Broadband Access Configuration Guide...