Hi, The only "split-horizon"- like thing i can come up with consists of ABR's not propagating any information learned from a LSA type 3 from another ABR through a non-backbone area, back into the backbone (area 0) again. In this manner i guess you could say "dont advertise back into area 0 something the area learned from area 0 in the first place".
Dont know if thats what you are referring to. Sincerely, Kim Pedersen desmond Black wrote: > > Explanation given is to mean that there is no Split-Horizon Rule in OSPF. > > I dont want to confuse, but there is a Split-Horizon equivalent logic > of Distance-Vector R'tng Protocol in OSPF but cannot be termed > explicitly as Split-horizon. > In this logic if the Next-Hop of the Prefix is in the Area to which > the ABR is going to advertise the route [in form of LSA] OR the Prefix > itself is in that LSA...... do not advertise it into that Area. > > Desmond Black, > In Pursuit of CCIE!! > India > > ----- Original Message ----- > From: [email protected] > To: "desmond Black" > Cc: ��ս�� , [email protected] > Subject: Re: [OSL | CCIE_RS] How to disable OSPF splite horizon ? > Date: Mon, 17 Aug 2009 16:25:14 +0000 (GMT) > > can you give a bit more detail on the ospf split horizon pls... > > ----- Original Message ----- > From: desmond Black > Date: Monday, August 17, 2009 10:28 am > Subject: Re: [OSL | CCIE_RS] How to disable OSPF splite horizon ? > To: 邵战新 , [email protected] > > > Split-Horizon is needed in Distance vector Protocols since they > > do not > > have complete view of the topology and therefore to avoid loops > > tehy do > > not send back the routes originated by advertising peer back to > > it. RIP > > actually uses Split-horizon with Poison-Reverse just for making > > it sure. > > Since Protocols like OSPF & ISIS do have complete view of the > network > > they can make the decision themselves when the routes advertised > > by them > > will have had covered most "COST" and therefore would never get into > > Routing table. > > > > ----- Original Message ----- > > From: 邵战新 > > To: [email protected] > > Subject: [OSL | CCIE_RS] How to disable OSPF splite horizon ? > > Date: Mon, 17 Aug 2009 19:12:07 +0800 > > > > I got this open end question in ccie lab exam. Although I > > search it , > > I can't get answer. Who can know it ? Thanks > > > > --------------------------------------------------------------- > > ----- > > > > 搜索本应是快乐的，不是么? 快乐搜索，有问必应！微软隆重推出! > > 立即试用！ > > _______________________________________________ > > For more information regarding industry leading CCIE Lab training, > > please visit www.ipexpert.com > > > > > > > > > > Desmond Black, > > In Pursuit of CCIE!! > > India > > > > -- > > Be Yourself @ mail.com! > > Choose From 200+ Email Addresses > > Get a Free Account at www.mail.com! > > > > > > > > > > -- > Be Yourself @ mail.com > Choose From 200+ Email Addresses > Get a *Free* Account at www.mail.com <http://www.mail.com>! > ------------------------------------------------------------------------ > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > -- // Freedom Matters // Follow my progress on: http://kpjungle.wordpress.com _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
