Re: Different MTU Sizes in same VLAN

With UDP, the problem can be packet loss

HTH,
Dan
Troubleshooting blog: http://dans-net.com

On Fri, Dec 4, 2009 at 2:48 AM, Abraham, Tharak <tharakabraham_at_gmail.com>wrote:

> 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
>> >
>> >
>> > Blogs and organic groups at http://www.ccie.net
>> >
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Received on Fri Dec 04 2009 - 08:52:51 ART