Brocade (BRCD) shares are slower today after cautious comments on the company’s earnings outlook from RBC Capital analyst David Cahill.

Cahill today said that the company is seeing “a softer than normal contribution from the switch business and a slower than anticipated ramp of the current mainframe upgrade cycle.” Cahill notes that the company previously forecast revenue for the April quarter of $340 million to $355 million and non-GAAP EPS of 13-15 cents. Cahill cut his revenue outlook today to $340 million from $347.5 million; his EPS estimate stays 14 cents.

For the October 2008 fiscal year, the company has forecast $1.43 billion to $1.47 billion in revenue and EPS of 55-60 cents. Cahill contends those numbers are too high: he cut his own revenue forecast for the year to $1.38 billion, from $1.43 billion, while his EPS estimate drops to 57 cents, from 59 cents. He maintains his Sector Perform rating and $8 price target on the stock.

BRCD today is down 38 cents, or 5.1%, at $7.10.