Nuts and Bolts

• Packet Encoding

  • OSPF is ÅgefficientlyÅh encoded

    • Positional fields
    • Holy 32-bit alignment provides tidy packet pictures, but not much else
    • Only LSAs are extensible (not Hellos, etc.)
    • Unrecognized LSA types not flooded (though opaque LSAs can suffice, if implemented universally, and IS-IS-like encoding can provide good granularity)

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