If you don't mind the pesky breaking fundamental rules of IP thing, it saves burning 4 Ip addresses (255.255.255.252 = 4 addresses) for a loopback interface. Since the Loopback is often set to give a router a "Name" for OSPF or BGP, it works okay. Ejay Hire 804-220-7724 877-200-7020,x7724 ... Answers are free. Explanations will cost you a Diet Pepsi. -----Original Message----- From: Alex Lee [mailto:[EMAIL PROTECTED]] Sent: Thursday, April 05, 2001 9:35 AM To: [EMAIL PROTECTED] Subject: Re: Loopback interface IP address Group, I was looking at some documents at CCO, and noticed that sometimes their examples use /32 IP address like : interface loopback 0 ip address 172.16.254.3 255.255.255.255 Can someone help me to understand reason behind in using this type of address in the configuration ? _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]