Foundry Networks just lost its CTO, Karl Triebes to F5 Networks. What gives? Silicon Valley insiders say that it might be something to do with mercurial ways of founder-CEO Bobby Johnson. Triebes isn’t the only one leaving Foundry. NDCF reports that Jim Brear, Foundry’s VP of Western U.S. sales, has said sayonara to the company. Brear joined the company in April from Force 10 Networks. Some say that Juniper Networks, which has secretly desired a switch maker was considering Foundry, but balked because they did not want to deal with BJ, who is a bit of a maverick!