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RFC 7296, "Internet Key Exchange Protocol Version 2 (IKEv2)", October 2014

Source of RFC: ipsecme (sec)

Errata ID: 6940
Status: Reported
Type: Technical
Publication Format(s) : TEXT

Reported By: warren.wang
Date Reported: 2022-04-21
Date Edited: 2022-06-13

Section .10 says:

o SPI Size (1 octet) - Length in octets of the SPI as defined by the
 IPsec protocol ID or zero if no SPI is applicable. For a
 notification concerning the IKE SA, the SPI Size MUST be zero and
 the field must be empty.

It should say:

o SPI Size (1 octet) - Length in octets of the SPI as defined by the
 IPsec protocol ID or zero if no SPI is applicable. For a
 notification concerning the IKE SA, the SPI Size MUST be zero and
 the SPI field must be empty.

Notes:

the field must be empty -> the SPI field must be empty

additional question: so for a notification concerning the IKE SA, the Protocol ID field still shall be zero?

Yes, for IKE SA notifications the SPI can be seen from the header, thus there is no point of repeating the SPIs in notify payload. The Protocol ID field of the notification payload indicates which type of SPI is inside the notification payload, thus if there is no SPI in there, then there is no point of having Protocol ID either.

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