Cisco

(CSCO) - Get Report

plans a "significant" announcement this morning, a prospect that has caused a minor rally in shares of

Check Point Software

(CHKP) - Get Report

.

Cisco said in a press release that it would issue a release at 8:30 a.m. EST then hold a conference call 90 minutes later. It declined to provide more details. The news led to a rumor Cisco might acquire Check Point, sending the latter's shares up 4% to $16.45 on Instinet.

Cisco was off 2% to $13.95.