Re: OSPFadjacencies
I'm not positive at what you're looking for, but if you are talking about the number of adjacencies that would be required to be fully meshed on a broadcast or NBMA network then the formula you're looking for is (N * (N-1) ) / 2. Of course this doesn't happen in OSPF since it uses DRs and BDRs in order to avoid having to have so many full adjacencies, so in OSPF each router (excluding the DR and BDR) has only two full adjacencies, one with the DR and one with the BDR and it is in a 2-way state with the rest of it's neighbors. Did that answer your question? At 01:38 PM 1/12/01 -0600, you wrote: Hello, I am drawing a blank and am trying to remember the formula to figure the number of adjacencies a router would have. I know it's a simple question, I am just drawing a blank. Thank You, -Eric _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: OSPFadjacencies
It will depend on the number of interfaces that are configured on the routers for OSPF operation. The main point to remember is that not all Routers will become adjacent. For a broadcast network such as Ethernet you may have N Routers. 2 of these Routers will be elected DR and BDR and will form an adjacency. So we have N-2 Routers left. These N-2 Routers will also try to form adjacencies with the DR and BDR, but these N-2 Routers will not form adjacencies with DR OTHER Routers. This saves on Network resources and computational Resources. HTH, Phil. --- Eric Gunn [EMAIL PROTECTED] wrote: Hello, I am drawing a blank and am trying to remember the formula to figure the number of adjacencies a router would have. I know it's a simple question, I am just drawing a blank. Thank You, -Eric _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
