IS IS Packet Format Link State


IS IS Link State PDU

  • LSP contain neighboring ISIS adj and its state.
  • Level 1 LSPs are flooded only to Level 1 within the same area.
  • Level 2 LSPs are flooded over all Level 2 adj.
  • LSP have a max age of 20 minutes.
  • LSP have a refresh timer of 15 minutes. Without refreshing them, LSP with wait for the zero-age lifetime.
  • Zero-age lifetime is the timer that keeps expired prefixes. Default timer is 60 seconds.


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