L2TPv3 over IP Tunnel Header (2)

• Session ID

  • Session ID = 0 reserved for L2TPv3 Control Messages
  • Session ID <> 0, identify the L2TPv3 session (local significance) at the remote end - in other words it identify the tunnel instance on the de-encapsulating router.

• Cookie

  • Optional Fileld
  • Variable length (0 /4/8 bytes)
  • Additional level of guarantee beyond session lookup.
  • The value configured at the source and destination router (for the session) must match in order for the frame to be passed out of the tunnel.

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