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
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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 a
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
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