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what is difference between designated router and backup
designated router and explain feature of both router.
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Answer Posted / karthik
DR and Bdr concept work in broadcat multi access network.
It reduces Lsa floodind within broadcast domain by electing
one DR and Bdr to which other routers in broadcast domain
form adjacency. So that only Dr and BDR have full adjacency
that means full link state database.
any change in broadcast domain will be send as link state
update to the Dr from which it will be forwarded to other
members reducing Lsa transfer
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