WLC 5760 with internal DHCP server, clients no get IP address

Question

Hi all,
I have  2  Cisco 5760 WLC (active-standby)  IOS-Xe 03.03.03SE  with  one WLAN.
 sh wlan summary 
Number of WLANs: 1
WLAN Profile Name                     SSID                           VLAN Status 
1    Invitados_ADSL                   Guest                          905  UP
sh vlan         
VLAN Name                             Status    Ports
1    default                          active    Te1/0/3, Te1/0/4, Te1/0/5, Te1/0/6, Te2/0/3
                                                Te2/0/4, Te2/0/5, Te2/0/6
100  VLAN0100                         active    Te1/0/1, Te2/0/1
101  Planta_1                         active    
905  Internet                         active    Te1/0/2, Te2/0/2
The DHCP server is internal.
Sometimes the clients no get IP address and the DHCP pool has IP addresses available.
The workaround done by me to solve the issue is “clear  ip dhcp  binding *”.
Some days later the problem appears again.
I see this bug with a similar problem:
NGWC blocks DHCP traffic if wireless broadcast disabled
CSCun88928
Description
Symptom:
Some clients set the BROADCAST flag on the DHCP Discover packet. This requires the DHCP server to reply with a broadcast.
In that case and if you are not using DHCP snooping on the 5760/3850, then the controller will block the return traffic unless you enable "wireless broadcast" which enables broadcast globally (and is thus not always desirable)
Conditions:
Seen on 3.3.2 IOS-XE
Workaround:
Use DHCP snooping with the "ip dhcp snooping wireless bootp-broadcast command"
OR
Enable "wireless broadcast" globally
My DHCP configuration is:
ip dhcp relay information trust-all
ip dhcp snooping vlan 905
ip dhcp snooping
ip dhcp excluded-address 172.16.0.1 172.16.0.19
ip dhcp excluded-address 172.16.1.250 172.16.1.254
ip dhcp pool Invitados
 network 172.16.0.0 255.255.254.0
 default-router 172.16.0.1 
 dns-server 212.66.160.2 212.49.128.65 
 lease 0 8
I see in Cisco documentation (http://www.cisco.com/en/US/docs/wireless/technology/5760_deploy/CT5760_Centralized_Configuration_eg.html) this configuration:
DHCP Snooping and Trust Configuration on CT5760
ip dhcp snooping vlan 100, 200
ip dhcp snooping wireless bootp-broadcast enable
ip dhcp snooping
interface TenGigabitEthernet1/0/1
description Connection to Core Switch
switchport trunk allowed vlan 100, 200
switchport mode trunk
ip dhcp relay information trusted ip dhcp snooping trust
interface Vlan100
description Client Vlan
ip dhcp relay information trusted
My question is,Do I have to add the command "ip dhcp snooping wireless bootp-broadcast enable" to solve the issue?
Thanks in advance.
Regards.
D

Answer 1

Yes, test it with the command you mentioned
ip dhcp snooping wireless bootp-broadcast enable
HTH
Rasika
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