3Com 7700 Configuration Manual page 115

The if-match mode of at least one node of the Route policy should be the
■
permit mode. When a Route-policy is used for the routing information
filtering, if a piece of routing information does not pass the filtering of any
node, then it means that the route information does not pass the filtering of
the Route-policy. When all the nodes of the Route-policy are in the deny
mode, then all the routing information cannot pass the filtering of the
Route-policy.
The if-match mode of at least one list item of the ip-prefix should be the permit
■
mode. The list items of the deny mode can be firstly defined to rapidly filter the
routing information not satisfying the requirement, but if all the items are in
the deny mode, any routes will not pass the ip-prefix filtering. You can define
an item of permit 0.0.0.0/0 less-equal 32 after the multiple list items in the
deny mode so as to let all the other routes pass the filtering (If less-equal 32 is
not specified, only the default route will be matched).
IP Routing Policy 107