Cabletron Systems SmartSwitch 8-slot User's Reference Manual page 96

Chapter 6: Routing Policy Configuration Guide
It is only possible to restrict the importation of OSPF ASE routes when functioning as
an AS border router.
Like the other interior protocols, preference cannot be used to choose between OSPF
ASE routes. That is done by the OSPF costs. Routes that are rejected by policy are
stored in the table with a negative preference.
For all examples in this section, refer to the configuration shown in Figure 3 on page
6 - 25.
6 - 24 SSR User Reference Manual