Precedence. This is a metric to be used to compare
this policy rule to other rules that a given packet may
match. A rule with a higher precedence value will be
chosen over one with a smaller value. In the case of
a tie, the rule index is used (lower wins).
Note: if there is multiple filters that a given packet
may match, it is advisable for a filter with a higher
precedence value to be defined with a lower rule
index than a filter with a lower precedence value
to improve forwarding performance.