RADIUS attribute from rfc7268

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EAPoL-Announcement

The EAPoL-Announcement Attribute contains EAPoL-Announcement Type-
      Length-Value (TLV) tuples defined within Table 11-8 of IEEE-802.1X
      .  The acronym "EAPoL" stands for Extensible
      Authentication Protocol over Local Area Network.

      Zero or more EAPoL-Announcement Attributes are permitted within an
      Access-Request, Access-Accept, Access-Challenge, Access-Reject,
      Accounting-Request, CoA-Request, or Disconnect-Request packet.When included within an Access-Request packet, EAPoL-Announcement
      Attributes contain EAPoL-Announcement TLVs that the user sent in
      an EAPoL-Announcement.  When included within an Access-Accept,
      Access-Challenge, Access-Reject, CoA-Request or Disconnect-Request
      packet, EAPoL-Announcement Attributes contain EAPoL-Announcement
      TLVs that the NAS is to send to the user in a unicast EAPoL-
      Announcement.  When sent within an Accounting-Request packet,
      EAPoL-Announcement Attributes contain EAPoL-Announcement TLVs that
      the NAS has most recently sent to the user in a unicast EAPoL-
      Announcement.

      A summary of the EAPoL-Announcement Attribute format is shown
      below.  The fields are transmitted from left to right.

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     Type      |    Length     |             String...
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type

      180

   Length

      >=3

   String

      The String field is one or more octets, containing EAPoL-
      Announcement TLVs in the format defined in Figure 11-8 ofof .  Any EAPoL-Announcement TLV Type MAY be
      included within an EAPoL-Announcement Attribute, including
      Organizationally Specific TLVs.  If multiple EAPoL-Announcement
      Attributes are present in a packet, their String fields MUST be
      concatenated before being parsed for EAPoL-Announcement TLVs; this
      allows EAPoL-Announcement TLVs longer than 253 octets to be
      transported by RADIUS.  Similarly, EAPoL-Announcement TLVs larger
      than 253 octets MUST be fragmented between multiple EAPoL-
      Announcement Attributes.

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