Re: speed diff ethernet half and full duplex

With older systems be careful using *AUTO with Cisco equipment. While it is no longer a problem, back in the V5R2 days IBM i had a real problem with Cisco switch negotiation. To combat the problem we A) waited for Rochester to fix it, they did, and in the mean time, B) hard coded the duplex and speed parameters.

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On 11/13/2011 10:05 PM, Kirk Goins wrote:

I am curious you say "Systems have no tape compatibility, and opposite
sides of the country." Does mean they aren't on the same local network?
If so then the limiting factor is the data connection between the 2 sites,
not the local switches or port speed/duplex.

If they are local, I have had systems at times that were set to *AUTO for
speed and duplex 'say' they were running at 100 and FULL but that wasn't
what I was getting. Hard coding the line to 100 Full or the Switch seemed
to fix the issue.





On Sun, Nov 13, 2011 at 11:15 AM, Jim Franz<franz400@xxxxxxxxxxxx> wrote:

> Attempting to ftp a 32 gig savf from a v5r4 system to v5r2 sys (I
> know...going the wrong way). Systems have no tape compatibility, and
> opposite sides of the country.
>
> The v5r4 has 5706 ethernet 10/100/1000 linespeed=*auto, duplex=*half
> No weekend view of the switch& router.
> The v5r2 has 2849 ethernet 10/100 linespeed=10M, duplex=*half
>
> I can see that if switches support it, get the v5r2 machine set to 100M or
> *auto linespeed, and duplex on both.
> Figuring 10 x faster xmit if linespeed increase, but any way to quantify
> the duplex part? What I can google (non-iSeries) says it's almost twice,
> but not quite..
>
> Also - framesize 1496 on each.
>
> After 12 hrs only 4 gig received (per netstat byte counts)
>
> Jim
> --