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Forum Replies

  1. Hi Rene,

    I know that Type 5 external routes are not normally allowed in a NSSA area, but is there a method by which they can be converted into Type 3/Type 7 so that they can be allowed in the area? Route summarization? I’m stumped.

    Thanks.

  2. Hi Rene,

    In regards to:
    <h3>OSPF NSSA ASBR and ABR</h3>
    You say: “When an OSPF NSSA router is both ASBR and ABR then it can flood LSA type 7 or LSA type 5 directly in another area. For this reason, the P-bit will be disabled on type 7 LSAs.”

    I feel i am missing something here.

    When you make R2 both ABR and ASBR by redistributing R2’s loopback , you say the conversion from 7 to 5 does not happen.

    But Still R1 gets the type 5 for the loopback from R2?

    I mean, if the P bit is not set, then how can this redistributed loopback on R2 make it to R1 as a type5?

    What i

    ... Continue reading in our forum

  3. Hi Edwin,

    In case anyone else reads this, we are talking about this post right:

    https://networklessons.com/ospf/ospf-nssa-p-bit-explained/

    You are correct. In this example, R2 will create a LSA type 5 directly which R1 can learn and a LSA type 7 that R4 will learn. There’s no need to create a LSA type 7 and then translate it into a type 5, that’s why the P-bit is disabled.

    Rene

  4. Pradeep,
    I assume you mean the following command
    translate type7 suppress-fa

    To answer this question, you first need to understand how a Type-5 External advertisement changes when it is translated by an NSSA ABR. When an LSA Type-7 to Type-5 translation occurs (only an NSSA ABR can do this), two properties change: 1) The advertising router and 2) The Forwarding Address.

    Regular Type 5 LSA
    In a regular (not translated) Type-5 LSA, the Advertising router is the ASBR itself, and the Forwarding Address is 0.0.0.0

    Regular Type 5 LSA

    LS Type: AS External Link
      Lin
    ... Continue reading in our forum

  5. Hi Rene, The “P” bit now has a spot where the “NP” was in Wireshark, on the top of the section it’s actually called Propagate. Just an FYI

    Great Practice Site, I passed my CCIE Route Switch two months ago…

    Mike

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