Hi Manav,
Auth Type we might need to add in AT(Authentication Trailer) Header for extensibility. Currently itself we can see the usage of Auth Type. Auth Type = 0 = Cryptographic authentication Auth Type = 1 (May be) = Cryptographic authentication with Session ID/Nonce support (security extension for ospfv3 when using manual key management) So its better to replace Reserved filed with Auth Type. Thanks Rajesh.
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