The general set of conditions that would cause
the  selection  of  one multipath route (set of
next hops for a given destination) is  referred
to as 'policy'.

Unless the mechanism indicated by ipForwardPro-
to specifies otherwise, the policy specifier is
the IP TOS Field.  The encoding of IP TOS is as
specified  by  the  following convention.  Zero
indicates the default path if no more  specific
policy applies.

+-----+-----+-----+-----+-----+-----+-----+-----+
|                 |                       |     |
|   PRECEDENCE    |    TYPE OF SERVICE    |  0  |
|                 |                       |     |
+-----+-----+-----+-----+-----+-----+-----+-----+

         IP TOS                IP TOS
    Field     Policy      Field     Policy
    Contents    Code      Contents    Code
    0 0 0 0  ==>   0      0 0 0 1  ==>   2
    0 0 1 0  ==>   4      0 0 1 1  ==>   6
    0 1 0 0  ==>   8      0 1 0 1  ==>  10
    0 1 1 0  ==>  12      0 1 1 1  ==>  14
    1 0 0 0  ==>  16      1 0 0 1  ==>  18
    1 0 1 0  ==>  20      1 0 1 1  ==>  22
    1 1 0 0  ==>  24      1 1 0 1  ==>  26
    1 1 1 0  ==>  28      1 1 1 1  ==>  30

Protocols defining 'policy' otherwise must  ei-
ther define a set of values which are valid for
this  object  or  must  implement  an  integer-
instanced  policy table for which this object's
value acts as an index.