dhcp snooping ,no option 82, giad set to ip.

[sarahr202]

HI everybody  

Please consider the following scenario on dhcp snooping on cisco switches.             

                  rest of network ---------SW1(f1/1-untrusted)-------------f1/2( untrusted) Sw2--------------------Dhcp server

Above sw1 and sw2 both are configured with ip dhcp snooping . Let say sw2 receives a dhcp discover message without any option 82 but  with giad set to some ip on its f1/2 port which is configured as untrusted. Will sw2 discard this packet or forwards it to dhcp server?

thanks and have a great weekend.

[Reza Sharifi · Accepted solution]

Hi Sarah,

Even without option 82 it will discarded since the packet is coming from an untrusted source.

Here is a link for more info:

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/snoodhcp.html#wp1114389

HTH

[sarahr202]

thanks Reza