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Forum Replies

  1. Hi Rene

    Could you clarify the differences between this and OSPFv3 Prefix Suppression?

    I believe the main difference is that type 8’s and 9’s are suppressed rather than type 1 or 2’s.

    Are stub’s advertised as /128’s?

    Also how does OSPF detect that a prefix is part of a transit network?

  2. Hi @chrisnewnham17,

    In OSPFv3, there is no prefix information in LSA type 1 and 2 anymore, you can find those in LSA type 8 and 9 so yes, OSPFv3 prefix suppression removes it from LSA type 8 and 9.

    About the prefix / transit network. Here’s a quick example with three routers connected like this:


    All routers are in area 0 and R3 is the DR:

    R3#show ipv6 ospf database prefix self-originate  
                OSPFv3 Router with ID ( (Process ID 1)
                    Intra Area Prefix Link States (Area 0)
      LS age: 8
      LS Type: Intra-Area-Prefix-LSA
    ... Continue reading in our forum

  3. Hi Rene ,
    Can explain a bit about how the how ospf detect transit links when performing ospf prefix suppression . Also, you are mentioning that /32 link is considered an invalid link in the lsdb.In such case why aren’ t the Loopback networks considered invalid when prefix suppression is enabled? These are also /32 links.


  4. Hello Ruwan

    There are two types of LSAs that we have to deal with in this lesson: The Router LSA, that is a type 1 LSA that contains prefix information about the network, and the Network LSA< that is a type 2 LSA that contains prefix information about the subnet.

    If you notice, in each of the LSAs described, the only networks th

    ... Continue reading in our forum

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