Multiple IP address provided to one Client device

[eeebbunee]

Hello Professionals,

Recently I'm having an DHCP issue with my C9300 switch.
Switch config is :

ip dhcp pool Wireless

 network 10.250.20.0 255.255.255.0
 network 10.250.24.0 255.255.255.128 secondary
 default-router 10.250.20.1
 

Whenever user tries to connect wireless, client device gets IP address from 10.250.20.1 which is switch's SVI.
However, from few days ago, whenever device requests IP, it provides multiple addresses with one mac address.

>> show ip arp | inc aabb.ccdd.0011
 10.250.20.38     aabb.ccdd.0011
 10.250.24.89     aabb.ccdd.0011
  10.250.24.104  aabb.ccdd.0011

I read about secondary IP pool is not recommended, but it is required at least for now..
Could anyone help..?

Thank you for providing your time.

[MHM Cisco World]

you config need 
1- dhcp exclude for VLAN SVI
2- secondary IP under VLAN SVI 

also try reduce the leased time to 30 min only 

MHM

[eeebbunee]

Hello, thank you for reaching me!

1) dhcp exclude for VLAN SVI:
  ip dhcp excluded-address 10.250.20.1 10.250.20.10
  ip dhcp excluded-address 10.250.20.254
  ip dhcp excluded-address 10.250.24.1

2) Secondary IP under VLAN SVI
   interface Vlan20
   description Wireless 
   ip address 10.250.24.1 255.255.255.128 secondary
   ip address 10.250.20.1 255.255.255.0

My current lease time is 0 12 59, I will change it to 0 0 30.

Thank you,