If I understand your question right, one of the reasons is for split horizon. I you have a hub and spoke frame relay network and lets say your hq router has a pvc to dallas and a pvc to boston both comming in to your s0 interface. well split horizon says that you will not send out a routing update out of the same interface that it came in from. So if you receive a routing update from boston into your s0 interface it will not forward the update to dallas because split horizon will not let it go out the same interface that it came from even though it is going to dallas not boston. It is to prevent routing loops. do a search on split horizon and routing loops for a more detailed explaination. Hope this helps. George, Head Janitor, CCNA CCDA Cisco Systems ""Jerry Seven"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > ----- Original Message ----- > From: Jerry Seven > Sent: Sunday, June 10, 2001 3:05 PM > Subject: [F.R.] What's the difference of multipoint subinterface to > physical > interface? > > > Hi Group, > > I don't quite understand why we need multipoint subinterface, during my > practice it seems that it's exactly the same to physical interface, what's > the > difference and in which case it's recommended but not physical interface? > > Thanks, > Jerry Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=7927&t=7927 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
