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 Area...... do not advertise it into that Area.
Desmond Black, In Pursuit of CCIE!! India ----- Original Message ----- From: "desmond Black" To: [email protected] Cc: [email protected], ��ս�� Subject: Re: [OSL | CCIE_RS] How to disable OSPF splite horizon ? Date: Mon, 17 Aug 2009 12:27:35 -0530 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! _______________________________________________ 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!
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