Advertising is performed within the routing domain by flooding (called reliable flooding in OSPF) the LSAs to all routers. In Figure 6-4(a), router 3 has decided to send LSAs to its neighbor routers (routers 1, 2, 5, and 6). The arrows in the figure symbolize the LSA transmissions. This example is for routers connected to each other with point-to-point (nonbroadcast) links.

Figure 6-4. Flooding Advertisements

Remember that the cause of these updates is that router 3 wished to inform its neighbors about a change at router 3, or to refresh the LSA information. The updates are performed with LSA packets.

When these neighbors ...

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