Group, There is a 'passive-interface Serial0/0' subcommand under 'router ospf 64' on both RouterB and RouterC. When I do a 'sh ip ospf int s0', I can see something like 'No Hellos '. Am I correct to assume that this 'passive-int serial0/0' is configured to prevent RouterB and RouterC from sending Hello packets out of their Serial0/0 interface to RouterA ? Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=19182&t=19182 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]