The identifier found within the service tag (commonly referred to in MEF as S-Tag) which is typically associated with OVC end points at an ENNI.
NOTE 1: This is the top tag in the stacked or Q in Q arrangement, or may be the sole identifier when customer frames are untagged (no underlying CE-VLAN).
NOTE 2: This is usually provider assigned but may be negotiated between provider and customer.
NOTE 3: When this field is populated, if the provider can not accommodate the requested value(s), it may be further negotiated between provider and customer.
NOTE 4: When this field is blank and the associated NCI code specifies an S-VLAN based map, the value will be assigned by the provider.
NOTE 5: When allowed by the provider product definition, S-VLANs may be specified in a range.
VALID ENTRIES:
0001-4095
NOTE 1: A single value may be entered or multiple four numeric S-VLANs are allowed to describe a non-contiguous list and/or ranges.
NOTE 2: Based on customer/provider negotiations, if a provider does not require a reiteration of all existing S-VLANs that are to be retained, the existing S-VLANs are retained by default when not provided.
USAGE: This field is conditional.
NOTE 1: Prohibited when the associated NCI code specifies anything other than an S-VLAN based map.
NOTE 2: Prohibited when the associated VPN-ID field is populated.
NOTE 3:Otherwise optional.
DATA CHARACTERISTICS: 9 numeric characters (including 1 pre-printed hyphen)
EXAMPLES: 0 7 5 2 -
0 7 5 0 - 0 7 5 9