North American Network Operators Group
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Re: Transit LAN vs. Individual LANs

  • From: Mark Smith
  • Date: Sat Feb 25 17:27:33 2006 
On Sun, 26 Feb 2006 08:41:45 +1030
Mark Smith <random@72616e646f6d20323030342d30342d31360a.nosense.org> wrote:

To qualify this better, there are no DR/BDR on the segment at all,
rather than there being ones that just aren't used :

> Automatic nighbour discovery via multicast hellos still happens, the
> difference is that the routers establish direct adjacencies between each
> other, rather than with the DR. While this costs additional RAM, and CPU
> during the SPF calc, the benefit of avoiding DR/BDR elections, and the
> 'DR/BDR' approximately 40 second listening phase when a third and
> subsequent routers come online may be well worth those costs.
> 

-- 

        "Sheep are slow and tasty, and therefore must remain constantly
         alert."
                                   - Bruce Schneier, "Beyond Fear"