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If an interface is half duplex, does that mean that it can transmit > at a rate of ifSpeed in each direction, but only one direction at a > time?

April 26, 2017direction DUPLEX Half interface mean rate time transmit

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If an interface is half duplex, does that mean that it can transmit > at a rate of ifSpeed in each direction, but only one direction at a > time?

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There seems to be nearly universal agreement on this interpretation. In searching the IETF mail archive (specifically 1998-07.mail.aug4) I found the following two excerpts which might be helpful: On Friday, 3 Apr 1998, Gary Hanson wrote: > > Should the ifSpeed for a T1 interface be 1.54Mb or should it be 3.08Mb > > in that it can sustain 1.54Mb in both the transmit and receive > > The latest for the DS1-MIB is > unambiguous on this point. In section 3.1 it says to use 1544000 > for the ifSpeed for DS1 lines. On Wednesday, 20 May 1998, John Flick wrote: > > 5) How do you tell if the interface is half or full-duplex for > > both ethernet and token ring interfaces? > > The current answer for Ethernet is ifMauType. Using ifSpeed, as one > response suggested, has been used by some vendors (a survey I did a > few months ago showed about half of the responders doubled ifSpeed for > full-duplex, though most agreed that this is a kludge). The consensus > of