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You are here: Home / ICND2 / Day 39 – OSPF / Day 39 Tasks / OSPF LSAs and the Link State Database (LSDB)

OSPF LSAs and the Link State Database (LSDB)

As stated in the previous section, OSPF uses several types of Link State Advertisements. Each LSA begins with a standard 20-byte LSA header. This header contains the following fields:

  • Link State Age
  • Options
  • Link State Type
  • Link State ID
  • Advertising Router
  • Link State Sequence Number
  • Link State Checksum
  • Length

The 2-byte Link State Age field states the time (in seconds) since the LSA was originated. The maximum age of the LSA is 3600 seconds, which means that if the age . . .

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