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TLV type field (2 bytes): A TLV frame means a TAG, type field means TAG type, the table is as
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.
Tag Type
0x0000
The end of a series tag in PPPoE data field, it is saved for ensuring the version
compatibility and is applied by some packets.
0x0101
Service name. Indicate the supplied services by network.
0x0102
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.
0x0103
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).
0x0104
AC-Cookies. It is used to avoid the vicious DOS attack.
0x0105
The identifier of vendor.
0x0110
Relay session ID. PPPoE data packet can be interrupted to other AC, this field is
used to keep other connection.
0x0201
The error of service name. When the requested service name is not accepted by
other end, the response packet will take this tag.
0x0202
The error of server name.
0x0203
Common error.
51.1.2.3 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.
Tag Explanation
Table 51-1: TAG value type of PPPoE
51-197
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