I have configured DHCP snooping + opt 82 on bridge SXT Lite . in version 6.44 of problems have not associated with what you need to do the eth port of the client trusted.
I don’t have the option which prohibits the substitution of the ip address to the cpe client. problem can be solved by writing a script based on log message level debug dhcp and creating a rule for the bridge filter, but dhcp-snooping packages are not displayed in log messages.
featureset need :
sw2(config)# show dhcp-snooping binding
MacAddress IP VLAN Interface Time Left
00163e-000101 192.168.10.10 10 A5 562
00163e-000103 192.168.30.10 30 A5 569