On Wed, 4 Aug 2010, Mack McBride wrote: > LX4 is not supported on the 6500s. > > Show int trans supported-list > ... > X2 LX4 NONE I have several 6509s running some flavor of 12.2(33)SXH, with lots of XENPAK/X2 SR, LX4, LR, and ER optics in production with no problems. jms