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

sarahr202
Level 5
Level 5

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.

1 Accepted Solution

Accepted Solutions

Reza Sharifi
Hall of Fame
Hall of Fame

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

View solution in original post

2 Replies 2

Reza Sharifi
Hall of Fame
Hall of Fame

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

thanks Reza

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