At 9:47 PM +0000 7/18/03, alaerte Vidali wrote: >Thanks. > >The addresses are contiguous. > >Suppose a network with many ABRs, one in each city. Any big city represents >small cities. Could you use an area for each ABR? (I am wondering if there >is no limit in the number of areas. I bet not).
In many topologies, it will get awfully expensive to have an ABR for each area. I did one network for a large enterprise (2500 routers and growing, of which 400 actively spoke OSPF). The seven campuses were all top-grade optical and stable, and it worked perfectly well to have routers with around 5 nonzero areas, so no area could be isolated by a single ABR failure. These were large areas, with a major campus (thousands of desktops) plus static/default routed field offices feeding into them (they could be NSSA). > >What about put toghether two cities and form a bigger area with two ABRs? In >that case, it would be necessary to connect these ABR through they >particular area and area 0, so the database would be the same, right? What's the medium cost between the two cities? Can you use demand circuits as a backup? Can you live with one more PVC and trust the physical connection? Is QoS-unpredictable cable or DSL available? Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=72634&t=72587 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
