Routing

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  • 1.  no-nssa-abr question

    Posted 03-06-2021 21:40
    This following topology comes from Understanding Not-So-Stubby Areas Filtering



    Also the sample configuration on R4 is as follows:

    set interfaces fe-1/2/0 unit 0 family inet6 address 9009:1::2/64

    set interfaces fe-1/2/1 unit 0 family inet6 address 9009:6::1/64

    set interfaces fe-1/2/2 unit 0 family inet6 address 9009:3::1/64

    set interfaces lo0 unit 0 family inet address 4.4.4.4/32

    set protocols ospf3 export static-to-ospf

    set protocols ospf3 no-nssa-abr

    set protocols ospf3 area 0.0.0.0 interface fe-1/2/2.0

    set protocols ospf3 area 0.0.0.0 interface lo0.0 passive

    set protocols ospf3 area 0.0.0.1 nssa default-lsa default-metric 10

    set protocols ospf3 area 0.0.0.1 nssa default-lsa metric-type 1

    set protocols ospf3 area 0.0.0.1 nssa default-lsa type-7

    set protocols ospf3 area 0.0.0.1 nssa no-summaries

    set protocols ospf3 area 0.0.0.1 interface fe-1/2/1.0

    set policy-options policy-statement static-to-ospf term 1 from protocol static

    set policy-options policy-statement static-to-ospf term 1 then accept

    set routing-options rib inet6.0 static route 1010::1/128 next-hop 9009:1::1

    set routing-options rib inet6.0 static route 2020::1/128 next-hop 9009:1::1

    I am doing a similar topology, but the result does not match my understanding.


    My understanding of the topology above is
    Area 1 is nssa area, so no type 3,4,5. R4 is both ABR and ASBR, so R4 will advertise Type 7 into Area 1. That means the static routes redistributed into R4 will be advertised into Area 1. So R1 goes to R5 via the specific ospf3 routes instead of the default route.
    Am I right ?


    In my lab, I did not see OSPF3 Type 7 from R4 when I did not configure no-nssa-abr.

    thanks a lot in advance !!!




  • 2.  RE: no-nssa-abr question

    Posted 03-06-2021 22:40
    I did the lab above. What I noticed is R4 advertises both Type 5 and Type 7 without no-nssa-abr configured, only advertises Type 5 with no-nssa-abr configured.

    So only when ABR is not an ASBR at the same time, it stops to advertise Type 5 into NSSA,  am I right ?


    thanks !!
    Original Message


  • 3.  RE: no-nssa-abr question

    Posted 03-06-2021 22:44
    Edited by ylara 03-06-2021 22:50



  • 4.  RE: no-nssa-abr question

    Posted 03-06-2021 22:50
    thanks so much !!

    All your diagrams are so amazing !!
    Original Message