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 ipForwardProto
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 either
define a set of values that are valid for
this object or must implement an integer-instanced
policy table for which this object's
value acts as an index.