Re: Different MTU Sizes in same VLAN

Dan,

Teh problem that can occur is poor performance only..right ?

MTU is preferred to be set to the same value across intended Vlans.
Do check out for ASIC limitation,even though it is configurable for 9k.(L3
switching)

Tharak

On Thu, Dec 3, 2009 at 11:14 PM, Danshtr <danshtr_at_gmail.com> wrote:

> The problem might be when you try to send large jumbo UDP frames to a host
> with MTU of 1500 bytes.
>
> With TCP, the receiving host will signal its MSS to the sending host, so it
> won't be a problem.
>
>
> HTH,
> Dan
> Troubleshooting blog: http://dans-net.com
>
>
> On Thu, Dec 3, 2009 at 5:52 PM, Tharindu Rukshan Bamunuarachchi <
> btharindu_at_gmail.com> wrote:
>
> > thanx a lot for the response.
> >
> > YES, I can set MTU to 9000.....
> >
> > If I enable MTU=9000 in switch ...
> >
> > how does switch recognize MTU size from/to different hosts ?
> >
> > how do hosts negotiate for specific MTU size ?
> >
> >
> > cheers
> >
> >
> > On Thu, Dec 3, 2009 at 7:14 PM, Scott Morris <smorris_at_ine.com> wrote:
> >
> > > Is it possible? Sure... But ask what the differences are.
> > >
> > > On your switch. CAN you set the MTU to 9000? That'll most likely
> help
> > > you answer your question there. And specifically thinking about what
> > > ethernet frames with a size of 9000 are called. Are these treated
> > > differently?
> > >
> > > HTH,
> > >
> > >
> > >
> > >
> > > *Scott Morris*, CCIE/x4/ (R&S/ISP-Dial/Security/Service Provider)
> #4713,
> > >
> > > JNCIE-M #153, JNCIS-ER, CISSP, et al.
> > >
> > > JNCI-M, JNCI-ER
> > >
> > > evil_at_ine.com
> > >
> > >
> > > Internetwork Expert, Inc.
> > >
> > > http://www.InternetworkExpert.com <http://www.internetworkexpert.com/>
> > >
> > > Toll Free: 877-224-8987
> > >
> > > Outside US: 775-826-4344
> > >
> > >
> > > Knowledge is power.
> > >
> > > Power corrupts.
> > >
> > > Study hard and be Eeeeviiiil......
> > >
> > >
> > >
> > >
> > >
> > > Tharindu Rukshan Bamunuarachchi wrote:
> > > > hi all,
> > > >
> > > > this is not directly related CCIE ... but that would be great if you
> > > could
> > > > answer ...
> > > >
> > > > Is it possible to keep 1500 and 9000 MTU enabled hosts in same VLAN.
> > > >
> > > > we have about 30+ boxes connected over 10G ethernet. we need to
> enable
> > > Jumbo
> > > > (MTU=9000) in few boxes.
> > > >
> > > > 1. Do we have to create seperate VLAN for MTU=9000 hosts ?
> > > > 2. Is it possible to mix both MTU enabled hosts in same vlan ?
> > > > 3. Is it depends on Switch and OS of hosts ?
> > > >
> > > > thankx a lot.
> > > >
> > >
> >
> >
> >
> > --
> > Tharindu Rukshan Bamunuarachchi
> >
> >
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Received on Fri Dec 04 2009 - 06:18:22 ART