HPE FlexNetwork 10500 Series Configuration Manual page 94

Figure 29 Network diagram
DHCP client
Configuration procedure
1. Assign IP addresses to interfaces on the switches. (Details not shown.)
2. Configure Switch B and Switch C as DHCP servers. (Details not shown.)
3. Configure the DHCP relay agent on Switch A:
# Enable DHCP.
<SwitchA> system-view
[SwitchA] dhcp enable
# Enable the DHCP relay agent on VLAN-interface 2.
[SwitchA] interface vlan-interface 2
[SwitchA-Vlan-interface2] dhcp select relay
# 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.)
Switch B
DHCP server1
1.1.1.1/24
Vlan-int3
1.1.1.100/24
Switch A
DHCP relay agent
Vlan-int2
22.22.22.1/24
Vlan-int4
2.2.2.100/24
Switch C
DHCP server2
2.2.2.2/24
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