On Tue, 8 Dec 2009, Joe Abley wrote: > > I find there is a lot of hard-coded wisdom that hard-coded speed duplex > are the way to avoid pain.
That was definitely true in the mid-to-late 1990s. > The last time I saw anybody do a modern survey of switches, routers and > hosts, however, it seemed like the early interop problems with autoneg > on FE really don't exist today, and on balance there are probably more > duplex problems caused by hard-configured ports that are poorly > maintained in the heat of battle than there are because autoneg is > flaky. Yes. The autoneg specification was fixed in 1998 so modern kit should interoperate properly. > I've also heard people say that whatever you think about autoneg in Fast > Ethernet, on Gigabit and 10GE interfaces it's pretty much never the > right idea to turn autoneg off. Autoneg is a required part of the gig E specification so you'd only be causing yourself trouble by turning it off. (I don't know if it'll also break automatic MDI/MDI-X (crossover) configuration, for an example of something that's nice to have.) Tony. -- f.anthony.n.finch <[email protected]> http://dotat.at/ GERMAN BIGHT HUMBER: SOUTHWEST 5 TO 7. MODERATE OR ROUGH. SQUALLY SHOWERS. MODERATE OR GOOD.
