IEEE8021ServiceSelectorValueOrNone
An integer that uniquely identifies a generic MAC service, or none. Examples of service selectors are a VLAN-ID (IEEE 802.1Q) and an I-SID (IEEE 802.1ah). An IEEE8021ServiceSelectorValueOrNone value is always interpreted within the context of an IEEE8021ServiceSelectorType value. Every usage of the IEEE8021ServiceSelectorValueOrNone textual convention is required to specify the IEEE8021ServiceSelectorType object that provides the context. It is suggested that the IEEE8021ServiceSelectorType object be logically registered before the object(s) that use the IEEE8021ServiceSelectorValueOrNone textual convention, if they appear in the same logical row. The value of an IEEE8021ServiceSelectorValueOrNone object must always be consistent with the value of the associated IEEE8021ServiceSelectorType object. Attempts to set an IEEE8021ServiceSelectorValueOrNone object to a value inconsistent with the associated IEEE8021ServiceSelectorType must fail with an inconsistentValue error. The special value of zero is used to indicate that no service selector is present or used. This can be used in any situation where an object or a table entry MUST either refer to a specific service, or not make a selection. Note that a MIB object that is defined using this TEXTUAL-CONVENTION SHOULD clarify the meaning of 'no service' (i.e., the special value 0), as well as the maximum value (i.e., 4094, for a VLAN ID).