Analog of "network" command

Hello! Sorry, maybe my question is silly but I cannot find an analog of IOS "network" command (i.e. how can I to define my network address range to annouce?). -- WBR, Yury Bokhoncovich, Senior System Administrator, NOC of F1 Group. Phone: +7 (3832) 106228, ext.140, E-mail: byg@center-f1.ru. Unix is like a wigwam -- no Gates, no Windows, and an Apache inside.