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An S-Tag is a an abbreviation of Service VLAN Tag.tag. The IEEE standard 802.1ad provides for double-tagging by service providers so that they can use VLANs allocated internally together with traffic already tagged as VLANs by service provider customers. In this double tagging, the S-Tag comes first followed by the C-Tag (customer tag). The standad 802.1ad specifies a TPID of 0x88a8 for the outer S-Tag. The MEF Implementation Agreement for Ethernet Interconnect Points (EIP) MEF 54 makes reference to situation in which an Operator able to implement S-Tag encapsulation at its ENNIs is connecting to an Operator lacking this capability at the corresponding ENNI. Image Added | ||
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name | S-Tag | pageid | 32248187
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Definition: MEF 51 - 3. Terminology & Acronyms (pg. 2) |
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