Troubleshooting Dhcp Server Configuration; Symptom; Analysis; Solution - HPE FlexNetwork 10500 Series Configuration Manual

[SwitchA-dhcp-class-ss] if-match rule 1 hardware-address aabb-aabb-0000 mask
ffff-ffff-0000
[SwitchA-dhcp-class-ss] quit
# Create DHCP option group 1 and customize Option 43.
[SwitchA] dhcp option-group 1
[SwitchA-dhcp-option-group-1] option 43 hex 800B0000020203040503030303
# Enable the DHCP server on VLAN-interface 2.
[SwitchA] interface vlan-interface 2
[SwitchA-Vlan-interface2] dhcp select server
[SwitchA-Vlan-interface2] quit
# Create DHCP address pool 0.
[SwitchA] dhcp server ip-pool 0
# Specify the subnet for dynamic address allocation.
[SwitchA-dhcp-pool-0] network 10.1.1.0 mask 255.255.255.0
# Customize Option 43.
[SwitchA-dhcp-pool-0] option 43 hex 800B0000020102030402020202
# Associate DHCP user class ss with option group 1.
[SwitchA-dhcp-pool-0] class ss option-group 1
[SwitchA-dhcp-pool-0] quit
Verifying the configuration
# Verify that Switch B can obtain an IP address on subnet 10.1.1.0/24 and the corresponding PXE
server addresses from the Switch A. (Details not shown.)
# On the DHCP server, display the IP addresses assigned to the clients.
[SwitchA] display dhcp server ip-in-use
IP address
10.1.1.2

Troubleshooting DHCP server configuration

Symptom

A client's IP address obtained from the DHCP server conflicts with another IP address.

Analysis

Another host on the subnet might have the same IP address.

Solution

1. Disable the client's network adapter or disconnect the client's network cable. Ping the IP
address of the client from another host to check whether there is a host using the same IP
address.
2. If a ping response is received, the IP address has been manually configured on a host. Execute
the dhcp server forbidden-ip command on the DHCP server to exclude the IP address from
dynamic allocation.
Client identifier/
Hardware address
aabb-aabb-ab01
Lease expiration
Jan 14 22:25:03 2015
65
Type
Auto(C)