snoop dog...

make relay agents, put your trust in the Lord...

dls1(config)#ip dhcp relay info trust-all                                               
dls1(config)#

dls2(config)#ip dhcp relay info trust-a
dls2(config)#

als1(config)#ip dhcp snoop                                                              
als1(config)#int rang f0/7 - 12                                                         
als1(config-if-range)#ip dhcp snoop trust                                               
als1(config-if-range)#int rang f0/15 - 24

als1(config)#ip dhcp snooping vlan 1                                                    
als1(config)#ip dhcp snooping vlan 100                                                  
als1(config)#ip dhcp snooping vlan 200  

als1#sh ip dhcp snooping                                                                
Switch DHCP snooping is enabled                                                         
DHCP snooping is configured on following VLANs:                                         
1,100,200                                                                               
Insertion of option 82 is enabled                                                       
Interface                    Trusted     Rate limit (pps)                               
------------------------     -------     ----------------                               
FastEthernet0/1              yes         unlimited                                      
FastEthernet0/2              yes         unlimited                                      
FastEthernet0/7              yes         unlimited                                      
FastEthernet0/8              yes         unlimited                                      
FastEthernet0/9              yes         unlimited                                      
FastEthernet0/10             yes         unlimited                                      
FastEthernet0/11             yes         unlimited                                      
FastEthernet0/12             yes         unlimited                                      
FastEthernet0/15             no          10                                             
FastEthernet0/16             no          10                                             
FastEthernet0/17             no          10                                             
FastEthernet0/18             no          10                                             
FastEthernet0/19             no          10                                             
FastEthernet0/20             no          10                                             
FastEthernet0/21             no          10                                             
FastEthernet0/22             no          10                                             
FastEthernet0/23             no          10                                             
FastEthernet0/24             no          10                                             
als1#