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:
- Link State Age
- Link State Type
- Link State ID
- Advertising Router
- Link State Sequence Number
- Link State Checksum
The 2-byte Link State Age field states the time since the LSA was originated (in seconds). The maximum age of the LSA is 3600 seconds, which means that if the age reaches . . .
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