internet is not working in LAN on a single switch

[Bijay Singh]

Hi friends 

I have a LAN network have 2 VLAN one for full internet access (VLAN 20) and one for limited access (VLAN 10) both working in whole LAN except 1 switch VLAN 20 is not working on that. problem is when I connect user in VLAN 10 it is working but when I connect with VLAN 20 user is getting APIPA IP. for VLAN 20 DHCP is core switch, and all switch port is in trunk mode.

please suggest what to do so VLAN 20 can also work on that switch

[MHM Cisco World]

two point check 
1- VLAN IP is correct match with DHCP Pool
2- there is no ACL drop DHCP 

MHM

[balaji.bandi]

when I connect user in VLAN 10 it is working but when I connect with VLAN 20 user is getting APIPA IP. for VLAN 20 DHCP is core switch, and all switch port is in trunk mode.

if the switch Layer  - Make sure switch has VLAN 20 created and check spanning tree, check the allowed list in trunk for vlan 20, DHCP snooping.

If the switch is Layer 3 , check ip helper address ?

still an issue provide sample configuration :

show run

show vlan

show spanning brief