I'm following the Cisco routing & switching course, but there is something I don't understand. It is said that OSPF exchange five packet type:
- Hello (discover neighbors)
- DBD (database description)
- LSR (link state request)
- LSU (link state update)
- LS ack (link state acknowledges)
I understand what these packets do, but when there is LSA (link state advertisement). As Cisco say, LSA are used to create/maintain the link state database. So what is the difference between LSA and LSR/LSU/LSAck ? As I understand, they all are used for the exact same purpose.
Thank you.
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