I believe Rc would know the network to be equal cost between the two routers.
-- RFC 1149 Compliant. ""Ouellette, Tim"" wrote in message news:[EMAIL PROTECTED].; > I have a question regarding # 2. > > let's say both routera and router b are connected and advertising the link > between them to router c. The connection from routera to routerc is a 64k > frame circuit. The link betwen routerb and routerc is a 64k ISDN (1 b). If > routera advertises the network between itself and routerb with a cost of 10, > and routerb advertises that same network with a cost of 100. All other > things being equal when routerc gets the two updates, he will prefer to take > the frame circuit towards routera to get to that network. Why would anyways > want this? What if the circuit between routerb and routerc was a backup ISDN > that you had to pay extra for to bring up during normal business hours or > something like that. I guess it all comes down to what your network is > doing. Whether two boxes advertise the same cost to a network is really only > dependent upon which path you want to take to get there. If they both > advertise the same, you may potentially load balance. If that's not desired, > crank up the cost of one of those boxes so it's path is less-desirable. > > router a --- routerb > \ / > \ / > \ / > routerc > > Was I just rambling? Did that make sense. > > Tim > > > -----Original Message----- > From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]] > Sent: Monday, March 04, 2002 2:48 PM > To: [EMAIL PROTECTED] > Subject: Re: basic OSPF questions [7:37142] > > > At 08:59 AM 3/4/02, bergenpeak wrote: > > > > > >2) Must a link cost be the same on for all routers that share the > >link? Is there a protocol reason for this? Some other reason? > > I couldn't find anything in RFC 2328 that says that two routers connected > to a link MUST agree on the cost. The RFC writers use the term MUST > carefully. If it were required, they would put it in the RFC. > > I think it would be a good idea to make them agree, though.... Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=37196&t=37142 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
