OSPF LSA's: What is type 9?

DeathmageDeathmage Banned Posts: 2,496
Ok,

So I know the following:

1 - Router
2 - DR
3 - ABR
4 - ASBR
5 - External Networks in same domain
7 - External Networks from External domain
9 - what is this????

not messing around, next ICDN2 I will now as much about L2 as I can....

Comments

  • james43026james43026 Member Posts: 303 ■■□□□□□□□□
  • mikeybinecmikeybinec Member Posts: 484 ■■■□□□□□□□
    Rick Graziani of Cisco Press refers to them as "Opaque LSAs"


    I keep seeing the word "link-local" when referring to them but it never mentions IPv6



    RFC 5250 - The OSPF Opaque LSA Option




    The Opaque LSA


    Opaque LSAs are types 9, 10, and 11 link state advertisements.
    Opaque LSAs consist of a standard LSA header followed by a 32-bit
    aligned application-specific information field. Standard link-state
    database flooding mechanisms are used for distribution of Opaque
    LSAs. The range of topological distribution (i.e., the flooding
    scope) of an Opaque LSA is identified by its link-state type. This
    section documents the flooding of Opaque LSAs.


    The flooding scope associated with each Opaque link-state type is
    defined as follows.


    o Link-state type-9 denotes a link-local scope. Type-9 Opaque LSAs
    are not flooded beyond the local (sub)network.


    o Link-state type-10 denotes an area-local scope. Type-10 Opaque
    LSAs are not flooded beyond the borders of their associated area.


    o Link-state type-11 denotes that the LSA is flooded throughout the
    Autonomous System (AS). The flooding scope of type-11 LSAs are
    equivalent to the flooding scope of AS-External (type-5) LSAs.
    Specifically, type-11 Opaque LSAs are 1) flooded throughout all
    transit areas, 2) not flooded into stub areas or Not-So-Stubby
    Areas (NSSAs), see [NSSA], from the backbone, and 3) not
    originated by routers into their connected stub areas or NSSAs.
    As with type-5 LSAs, if a type-11 Opaque LSA is received in a stub
    area or NSSA from a neighboring router within the stub area or
    NSSA, the LSA is rejected.


    The link-state ID of the Opaque LSA is divided into an Opaque type
    field (the first 8 bits) and a type-specific ID (the remaining 24
    bits). The packet format of the Opaque LSA is given in Appendix A.
    Section 7 describes Opaque type allocation and assignment.


    The responsibility for proper handling of the Opaque LSA's flooding
    scope is placed on both the sender and receiver of the LSA. The
    receiver must always store a valid received Opaque LSA in its link-
    state database. The receiver must not accept Opaque LSAs that
    violate the flooding scope (e.g., a type-11 (domain-wide) Opaque LSA
    Cisco NetAcad Cuyamaca College
    A.S. LAN Management 2010 Grossmont College
    B.S. I.T. Management 2013 National University
  • mikeybinecmikeybinec Member Posts: 484 ■■■□□□□□□□
    Diane Teare, author of Implementing Cisco IP Routing (Cisco Press, 2010) sez:

    "Types 9,10,or 11 are designated for future upgrades to OSPF for distributing application-specific information through an OSPF domain. For example, Cisco Systems uses Type 10 Opaque LSAs for MPLS Traffic.
    Cisco NetAcad Cuyamaca College
    A.S. LAN Management 2010 Grossmont College
    B.S. I.T. Management 2013 National University
  • powmiapowmia Users Awaiting Email Confirmation Posts: 322
    Stop googling random crap and throwing answers at a person that will just confuse them.

    Type-9 LSAs are link-local opaque LSAs. They are defined in an RFC (not reserved for future use). Yes they are link-local, not to be confused with IPv6 link-local; it just means they aren't to be flooded beyond a single link.

    Type-9 LSAs are send to a neighbor with the GR flag set, as a part of the graceful-restart process.
Sign In or Register to comment.