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DR/BDR Question

 
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xerobyte
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Post subject: DR/BDR Question
Posted: Mon Oct 11, 2010 8:22 pm
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I had this question on a recent test and cannot figure out how they could decide it was the DROTHER.
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Headhunter
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Post subject:
Posted: Tue Oct 12, 2010 12:41 am
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A DROTHER remains in 2way state and becomes only full with the DR and BDR
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xerobyte
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Post subject:
Posted: Tue Oct 12, 2010 6:53 am
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But how would someone determine with the "sh ip ospf neighbor" command that the "HQ" router was the DROTHER, and not the DR or BDR?
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xerobyte
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Posted: Sun Oct 17, 2010 4:16 pm
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Sorry for double posting but no one has said anything for a while. I just want to know if this question is possible to answer with the given information.
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warpedlogic
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Post subject:
Posted: Thu Aug 18, 2011 6:07 pm
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You can tell via the sh ip ospf nei command because in OSPF, if a router is not a DR or BDR it is called DROTHER. Since DR and BDR are both listed in that nei table, then the HQ router must be DROTHER.

You can also tell by the "2WAY/DROTHER" state in the table. If a router was a DR or BDR, then it would have a "FULL" state to all neighbors. Since this has a 2Way state, it must be a DROTHER router.
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