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DHCP snooping and ip helper interaction
In our environment our DHCP servers do not support option 82 so we found that we had to put “no ip dhcp snooping information option” on our switches to make DHCP work consistently…
Bill Murphy Senior Network Analyst University of Texas Health Science Center - Houston
—–Original Message—– From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Haukur ^srparson Sent: Sunday, March 23, 2008 5:01 PM To: Geert Nijs; ccielab@groupstudy.com Subject: RE: DHCP snooping and ip helper interaction
Hi Geert, If you add the “ip dhcp relay information trusted” on the interface on the distribution switch the DHCP service should start working again, this command allows the L3 interface to forward packets that include DHCP Option 82 informations.
R. Haukur CCIE#18026
—–Original Message—– From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Geert Nijs Sent: 22. mars 2008 15:33 To: ccielab@groupstudy.com Subject: DHCP snooping and ip helper interaction
All,
Does a DHCP snooping configuration NEED an ip helper address defined on the same switch ?
In my lab setup, DHCP breaks when i configure dhcp snooping without ip helper address. Setup:
Access = C3750 , 12.2(25)SE2 Distribution= C6500, sup720, 12.2(18)SXF8
ACCESS int vlan 100 ip address 1.1.1.250 255.255.255.0
