Re: dhcp snooping

main point is wherever you're dhcp server is connected to trust that port as if you don't then the default behaviour would be to drop any dhcp client discover messages, the server would then be able to create the bindings into dhcp snooping database for mac, ip, port and vlan once the discovers are sent upstream to the server.

anything other then the dhcp server or further upstream switches that connect to the dhcp server should be dhcp snooping trusted the caveat here is whether you leave the switch to insert option 82 into the client discover messages or not where the better solution would be to trust dhcp snooping information option.

Good luck

--
BR
Tony
Sent from my iPhone on 3
On 16 Sep 2013, at 22:24, Imran Ali <immrccie_at_gmail.com> wrote:
> hi all ,
> i am enabling dhcp snooping , but i  have  seen some threads  in  support
> forum , saying they face issues on thier 3560  when configured  with  voice
> vlan,
> 
> we  have  voice vlan ,  data vlan , and one vlan for access point .
> 
> i have  to trust  the  trunk links  going to the core switches and  all
> others   as  untrusted .
> 
> 
> 1) Have  any one in production had  face  issues with  dhcp snooping with
> voice/data vlans ?
> 
> 2) Access points  connected ports  are  access ports  i think  they must be
> left as untrusted right ?
> 
> 
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