Troubleshooting Dhcp Relay Agent Configuration - 3Com MSR 50 Series Configuration Manual

Troubleshooting DHCP
Relay Agent
Configuration
address of Ethernet1/2 is 10.1.1.2/24 that communicates with the DHCP server
10.1.1.1/24. As shown in the figure below, Router A forwards messages between
DHCP clients and the DHCP server.
Network diagram
Figure 174 Network diagram for DHCP relay agent (on a router)
DHCP client DHCP client
Eth1 /1 Eth1/2
10 .10 .1 .1/24 10.1.1.2/24
Eth1 /0
10.1.1 .1/24
Router A Router B
DHCP relay agent DHCP server
DHCP client DHCP client
Configuration procedure
# Enable DHCP.
<RouterA> system-view
[RouterA] dhcp enable
# Enable the DHCP relay agent on Ethernet1/1.
[RouterA] interface ethernet 1/1
[RouterA-Ethernet1/1] dhcp select relay
# Configure DHCP server group 1 with the DHCP server 10.1.1.1, and correlate
DHCP server group 1 with Ethernet1/1.
[RouterA-Ethernet1/1] quit
[RouterA] dhcp relay server-group 1 ip 10.1.1.1
[RouterA] interface ethernet 1/1
[RouterA-Ethernet1/1] dhcp relay server-select 1
n
Performing configuration on the DHCP server is also required to guarantee the
■
client-server communication via the DHCP relay agent. Refer to
Configuration Examples" on page 585
information.
If the DHCP relay agent and server are on different subnets, routes in between
■
must be reachable.
Symptom
DHCP clients cannot obtain any configuration parameters via the DHCP relay
agent.

Troubleshooting DHCP Relay Agent Configuration

for DHCP server configuration
597
"DHCP Server