At 07:08 PM 4/26/01, Tony van Ree wrote:
>Hi,
>
>True!! Only 100Meg in and 100Meg out but on a 100Meg Half duplex connection
>at best you get less than 50Meg. You must listen to your own signal
>anything over 50% in one direction is pure rubbish. In reality over 30% of
>the specified bandwidth you are probably already retransmitting heaps.
And that is pure rubbish. See this URL:
http://www.research.digital.com/wrl/publications/abstracts/88.4.html
>I therefore disagree that there is no significant difference in network
>performance. However, the ability of the server and or the network cards
>ability to pull data off the network and deliver it to the server is a
>different matter. A good example is from back in the old days with an 8bit
>10Meg Half duplex card into a I386 a real speed of 280K was more the
reality.
>
>Just some thoughts.
>
>Teunis,
>Hobart, Tasmania
>Australia
>On Thursday, April 26, 2001 at 03:14:50 PM, David Chandler wrote:
>
> > hey! somebody gets it! Thanks Priscilla:
> >
> > It always bothers me that full-duplex is refereed to as 200 meg. The
> > server folks always think that all their performance issues will go away
> > when they go to "full-duplex". Sure, no collision, but considering the
> > unbalanced nature of client/server traffic it doesn't make that big of a
> > throughput difference.
> >
> > I'm surprised that my T1's are not referred to as 3 mbps links. They are
> > full-duplex too :->
> >
> > DaveC
> >
> > Oppenheimer wrote:
> > >
> > > At 12:23 AM 4/26/01, md. nazri wrote:
> > > >if it's true..that's a good indicator for hardware health checkup.....
> > > >another Q, if we set the FE to be full-duplex, does it mean we get
>100meg
> > > >for tx and 100meg for rx, so total 200meg for a connection...?
> > >
> > > Each of the two stations on a point-to-point FE full-duplex link get
> > > dedicated 100 Mbps bandwidth for transmitting. One station's transmit
> > > medium is the other's receive medium. Some people call this 200 Mbps.
In
> > > actuality most traffic types don't take advantage of this.
> > >
> > > >----- Original Message -----
> > > >From: "Priscilla Oppenheimer"
> > > >To:
> > > >Sent: Thursday, April 26, 2001 9:07 AM
> > > >Subject: Re: FastEthernet is up, Line protocol down [7:1828]
> > > >
> > > >
> > > > > I don't think it's just Fast Ethernet. I've seen "Slow" Ethernet
>report
> > > > > that the interface is up, down when nothing was attached. It seems
to
> > > just
> > > > > be an indication that the interface passed a hardware check.
> > > > >
> > > > > Priscilla
> > > > >
> > > > > At 08:21 PM 4/25/01, md. nazri wrote:
> > > > > >thanks for the answer...
> > > > > >i understand that LP will down if no connection attach, but why FE
> > still
> > > >up,
> > > > > >does it up forever until we shut it down? Does it apply the same
to
> > > > > >Ethernet..?
> > > > > >----- Original Message -----
> > > > > >From: "Vincent Chong"
> > > > > >To:
> > > > > >Sent: Wednesday, April 25, 2001 3:48 PM
> > > > > >Subject: Re: FastEthernet is up, Line protocol down [7:1828]
> > > > > >
> > > > > >
> > > > > > > 1) I guess you enable the fastethernet port in the running
> > > > > > > configuration. You have to
> > > > > > > shutdown the port, so the port will administrative shut
down
> > and
> > > >line
> > > > > > > protocol down.
> > > > > > >
> > > > > > > 2) Line protocol will up if there is any phyiscal connection
> > > >attached
> > > > > >to
> > > > > > > Fastethernet.
> > > > > > > Becasue the port in your router will detect keepalive
signal,
> > > when
> > > >it
> > > > > > > detected, it will
> > > > > > > up. You can type no keepalive under interface
>configuration,
> > > >the
> > > > > > > ethernet interface
> > > > > > > will keep up even no physical connection. You have to
enable
> > the
> > > > > > > interface, of courese.
> > > > > > >
> > > > > > > Hope this help
> > > > > > > Vincent Chong
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > ""md. nazri"" hi all,
> > > > > > > > got one question regarding FastEthernet on Cisco 2620..
> > > > > > > > why the status showed FastEthernet is up, Line protocol down
> > > >although
> > > > > >the
> > > > > > > > cable was pulled out from the port...in what cases the port
>will
> > > > > >down..any
> > > > > > > > help appreciated
> > > > > > > >
> > > > > > > > tq
> > > > > > > > FAQ, list archives, and subscription info:
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> > > > >
> > > > >
> > > > > ________________________
> > > > >
> > > > > Priscilla Oppenheimer
> > > > > http://www.priscilla.com
> > > > > FAQ, list archives, and subscription info:
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> > > > > Report misconduct and Nondisclosure violations to
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> > >
> > > ________________________
> > >
> > > Priscilla Oppenheimer
> > > http://www.priscilla.com
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> >
>
>
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