RADIUS attribute from rfc2869

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Framed-Pool

This Attribute contains the name of an assigned address pool that
      SHOULD be used to assign an address for the user.  If a NAS does
      not support multiple address pools, the NAS should ignore this
      Attribute.  Address pools are usually used for IP addresses, but
      can be used for other protocols if the NAS supports pools for
      those protocols.A summary of the Framed-Pool Attribute format is shown below.  The
   fields are transmitted from left to right.

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

   Type

      88 for Framed-Pool

   Length

      >= 3

   String

      The string field contains the name of an assigned address pool
      configured on the NAS.

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