Thursday, August 22, 2013

DHCP Snooping

Message of the day:

If you (or your colleague) happens to turn on something like the following on a Monday (without telling anybody):

!
ip dhcp snooping vlan 14,87,99,62
no ip dhcp snooping information option
ip dhcp snooping
!


Make sure that before Thursday morning (when all your APs renew their leases) that you add this to the uplinks on your switches:

!
interface GigabitEthernet1/1/1
  ip dhcp snooping trust
!


If not, you're going to have a bad Thursday morning.