Riverstone Networks

(RSTN)

, an Internet infrastructure company, was up 2.5% at midday after three analysts began coverage. The stock earlier had slipped to a 52-week low of $6.69.

Morgan Stanley Dean Witter

started Riverstone with an outperform and a price target of $17.

J.P. Morgan Chase

gave it a buy rating and a target of $16.

Salomon Smith Barney

assigned it an outperform rating.

Riverstone was spun off in February from

Cabletron Systems

(CS) - Get Report

.