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# Specify the IP addresses of the DHCP servers.
[SwitchA-Vlan-interface2] dhcp relay server-address 1.1.1.1
[SwitchA-Vlan-interface2] dhcp relay server-address 2.2.2.2
# Specify the DHCP server selecting algorithm as master-backup.
[SwitchA-Vlan-interface2] dhcp relay server-address algorithm master-backup
# Configure the DHCP relay agent to switch back to the master DHCP server 3 minutes after it
switches to the backup DHCP server.
[SwitchA-Vlan-interface2] dhcp relay master-server switch-delay 3
Verifying the configuration
# Verify that the DHCP client cannot obtain an IP address and that the following log is output in about
30 seconds.
DHCPR/3/DHCPR_SERVERCHANGE: -MDC=1;
Switched to the server at 2.2.2.2 because the current server did not respond.
# Enable DHCP on the DHCP server at 1.1.1.1. (Details not shown.)
# Verify that the DHCP client cannot obtain an IP address and that the following log is output in about
3 minutes.
DHCPR/3/DHCPR_SWITCHMASTER: -MDC=1;
Switched to the master DHCP server at 1.1.1.1.
# Verify that the DHCP client obtains an IP address. (Details not shown.)
Troubleshooting DHCP relay agent configuration
Failure of DHCP clients to obtain configuration parameters
through the DHCP relay agent
Symptom
DHCP clients cannot obtain configuration parameters through the DHCP relay agent.
Solution
Some problems might occur with the DHCP relay agent or server configuration.
To locate the problem, enable debugging and execute the
display command on the DHCP relay
agent to view the debugging information and interface state information.
Check that:
• DHCP is enabled on the DHCP server and relay agent.
• The DHCP server has an address pool on the same subnet as the DHCP clients.
• The DHCP server and DHCP relay agent can reach each other.
• The DHCP server address specified on the DHCP relay interface connected to the DHCP
clients is correct.
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