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Re: Transit LAN vs. Individual LANs
From: Mark Smith <random () 72616e646f6d20323030342d30342d31360a nosense org>
Date: Sun, 26 Feb 2006 08:56:26 +1030


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"


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