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2.2.1.1 Protocol Version Numbers as a Versioning Mechanism

  • Artigo

This protocol has five versions: 1, 2, 4, 5, and 6 (version 3 is reserved and not used).<2> For each version, there is a set of protocol elements that MUST be supported (called version-required elements), a set of optional protocol elements that SHOULD be supported (called version-optional elements), and a set of protocol elements that MUST NOT be supported. The following sections provide versioning tables that specify the scope of each protocol version with respect to the three mentioned sets.

The tables contain the following values.

Value

Description

Yes

The protocol element MUST be supported in the respective protocol version.

No

The protocol element MUST NOT be supported in the respective protocol version.

Optional

The protocol element SHOULD be supported in the respective protocol version.