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Thread: Opaque LSA

  1. Resident Underachiever EdTheLad's Avatar
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    #1

    Default Opaque LSA

    As per below, anyone know what the Opaque ID 0 is used for? it has 0 links, not sure what it represents?


    R3#sh ip ospf database opaque-area self-originate

    OSPF Router with ID (3.3.3.3) (Process ID 1)

    Type-10 Opaque Link Area Link States (Area 0)

    LS age: 1850
    Options: (No TOS-capability, DC)
    LS Type: Opaque Area Link
    Link State ID: 1.0.0.0
    Opaque Type: 1
    Opaque ID: 0
    Advertising Router: 3.3.3.3
    LS Seq Number: 80000026
    Checksum: 0x16DE
    Length: 28
    Fragment number : 0

    MPLS TE router ID : 3.3.3.3

    Number of Links : 0

    LS age: 1349
    Options: (No TOS-capability, DC)
    LS Type: Opaque Area Link
    Link State ID: 1.0.0.1
    Opaque Type: 1
    Opaque ID: 1
    Advertising Router: 3.3.3.3
    LS Seq Number: 8000002C
    Checksum: 0x5641
    Length: 132
    Fragment number : 1

    Link connected to Point-to-Point network
    Link ID : 4.4.4.4
    Interface Address : 10.0.34.3
    Neighbor Address : 10.0.34.4
    Admin Metric : 100
    Maximum bandwidth : 12500000
    Maximum reservable bandwidth : 0
    Number of Priority : 8
    Priority 0 : 0 Priority 1 : 0
    Priority 2 : 0 Priority 3 : 0
    Priority 4 : 0 Priority 5 : 0
    Priority 6 : 0 Priority 7 : 0
    Affinity Bit : 0x0
    IGP Metric : 100

    Number of Links : 1

    LS age: 1350
    Options: (No TOS-capability, DC)
    LS Type: Opaque Area Link
    Link State ID: 1.0.0.2
    Opaque Type: 1
    Opaque ID: 2
    Advertising Router: 3.3.3.3
    LS Seq Number: 80000027
    Checksum: 0x584
    Length: 132
    Fragment number : 2

    Link connected to Point-to-Point network
    Link ID : 1.1.1.1
    Interface Address : 10.0.13.3
    Neighbor Address : 10.0.13.1
    Admin Metric : 10
    Maximum bandwidth : 12500000
    Maximum reservable bandwidth : 0
    Number of Priority : 8
    Priority 0 : 0 Priority 1 : 0
    Priority 2 : 0 Priority 3 : 0
    Priority 4 : 0 Priority 5 : 0
    Priority 6 : 0 Priority 7 : 0
    Affinity Bit : 0x0
    IGP Metric : 10

    Number of Links : 1
    Networking, sometimes i love it, mostly i hate it.Its all about the $$$$
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  2. Senior Member
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    #2
    It distributes the TE router-id. There are two types of TLVs that are used in the opaque LSAs for TE, type 1 and type 2. Type 1 is the one you see with the MPLS-TE router-id and 0 links. Type 2 contains the sub-TLVs for each link where each sub-TLV describes some aspect of it like attribute flags, te metric, bandwidth, etc. So basically, each router will have one type 1 and then one type 2 for every link that has TE enabled. My reference is the book Traffic Engineering with MPLS, chapter 3.
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