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Church Of The
Swimming Elephant

12. Link State Advertisements Connected: An Internet Encyclopedia
12. Link State Advertisements

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Next: 12.1. The Link State Advertisement Header

12. Link State Advertisements

12. Link State Advertisements

Each router in the Autonomous System originates one or more link state advertisements. There are five distinct types of link state advertisements, which are described in Section 4.3. The collection of link state advertisements forms the link state or topological database. Each separate type of advertisement has a separate function. Router links and network links advertisements describe how an area's routers and networks are interconnected. Summary link advertisements provide a way of condensing an area's routing information. AS external advertisements provide a way of transparently advertising externally-derived routing information throughout the Autonomous System.

    Type   Dest        Area   Path  Type   Cost   Next     Adv.
                                                  Hop(s)   Router(s)
    N      Ib          0      intra-area   16     RT3      *
    N      Ia          0      intra-area   21     RT3      *
    BR     RT3         0      intra-area   1      *        *
    BR     RT10        0      intra-area   16     RT3      *
    BR     RT11        0      intra-area   19     RT3      *
    N      N9-N11,H1   0      inter-area   20     RT3      RT11

                  Table 14: Changes resulting from an
                        additional virtual link.

Each link state advertisement begins with a standard 20-byte header. This link state advertisement header is discussed below.

Next: 12.1. The Link State Advertisement Header

Connected: An Internet Encyclopedia
12. Link State Advertisements


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