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follows.
TLV length field (2 bytes): Specify the length of TAG data field.
TLV data field (the length is not specified): Specify the transmitted data of TAG.
The end of a series tag in PPPoE data field, it is saved for ensuring the version
compatibility and is applied by some packets.
Service name. Indicate the supplied services by network.
Server name. When user receives the PADO response packet of AC, it can
obtain the server name from the tag and select the corresponding server.
Exclusive tag of the host. It is similar to tag field of PPPoE data packets and is
used to match the sending and reveiving end (Because broadcast network may
exist many PPPoE data packets synchronously).
AC-Cookies. It is used to avoid the vicious DOS attack.
The identifier of vendor.
Relay session ID. PPPoE data packet can be interrupted to other AC, this field is
used to keep other connection.
The error of service name. When the requested service name is not accepted by
other end, the response packet will take this tag.
The error of server name.
Table 11-1 TAG value type of PPPoE
47.1.2.3 PPPoE Intermediate Agent vendor tag Frame
The following is the format of tag added by PPPoE IA, adding tag is the Uppermost function of
PPPoE IA.