Juniper JUNOSE 11.1.X - COMMAND REFERENCE N TO Z 4-6-2010 Command Reference Manual page 1279

Chapter 7: S Commands
suppress-default
[ no ] suppress-default
Syntax
Command introduced before JUNOSe Release 7.1.0.
Release Information
Suppresses an IS-IS level 1-2 router from indicating that it can reach destinations
Description
outside the area, thus preventing level 1 routers from installing a default route to the
level 1-2 router. The no version disables suppression of default routes.
Router Configuration
Mode
1237
suppress-default