abr Dr and bdr question ospf

hitmenhitmen Posts: 133Banned
in CCNP
Hi,

I understand that all internal routers need to connect to the Dr and bdr.

How ever, does the abr need to be connected to the Dr and bdr separately?

Thanks

Comments

  • TechGuru80TechGuru80 Posts: 1,537Member ■■■■■□□□□□
    Are you asking as far as redundancy? Because for that it would be a good idea.
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  • hitmenhitmen Posts: 133Banned
    TechGuru80 wrote: »
    Are you asking as far as redundancy? Because for that it would be a good idea.

    Normally is there redundancy for abr
    ?
  • hitmenhitmen Posts: 133Banned
    I mean is there only one abr between areas? It is dangerous if it goes down? Normally is the Dr connected to the abr? Or is it both the Dr and the bdr that is connected to the abr?
  • tomtom1tomtom1 Posts: 375Member
    Remember that a ABR router is a router that connects another area to area 0. However, per area (depending on the OSPF network type), a DR and a BDR might be elected. However, a device that is the DR or BDR for a given area can also be the ABR for an area. And depending on the entire design, when the ABR goes down, it might pose problems since, for example, the LSA type 3 (summary LSA) generated by that ABR will not be flooded through the backbone anymore.
  • hitmenhitmen Posts: 133Banned
    OK. May I should rephrase. How many abr can be placed between 2 areas?
  • HeeroHeero Posts: 486Member
    There isn't a limit to how many ABRs an area can contain.

    And DR and BDR is a completely separate concept.
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