LSA Flooding

• LSA updates, generally, indicate a topology change in the network.

• The type of network determines which multicast address is used to send the updates.

• Point-to-multipoint networks use the adjacent router’s unicast IP.

• The LSA update multicast addresses:

  • 224.0.0.5 – AllSPFRouters
  • 224.0.0.6 - AllDR

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