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Hi Peter,
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<div class="">Maybe my English it not good enough. I would understand the highest but not the smallest. You know? :)</div>
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<div class="">You mean if any VM has 2000 set and another will set 3000 we get 3000 for all on the bridge? What I don’t understand is if the bridgec already has 9000 set as MTU they will be shrined down?!?</div>
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<div class="">For me I think it lags of some functionality. </div>
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</span></span></strong><strong><span style="FONT-SIZE: 9pt"><span style="FONT-SIZE: 8pt">Sven Vogel</span></span><br style="FONT-SIZE: 9pt">
</strong><span style="FONT-SIZE: 8pt">Teamlead Platform<br>
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<div class="">Am 08.08.2019 um 11:43 schrieb Peter Crowther <<a href="mailto:peter.crowther@melandra.com" class="">peter.crowther@melandra.com</a>>:</div>
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<div dir="ltr" class="">On Thu, 8 Aug 2019 at 10:08, Sven Vogel <<a href="mailto:S.Vogel@ewerk.com" class="">S.Vogel@ewerk.com</a>> wrote:<br class="">
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<div style="overflow-wrap: break-word;" class="">The question for me is why they use the smallest?
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<div class="">Because otherwise some frames won't get through because the interface can't receive them, and the job of network equipment is to enable and maintain communication :-).<br class="">
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<div class="">Cheers</div>
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<div class="">Sven<br class="">
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<div class="">- Peter</div>
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<div class="">Am 31.07.2019 um 15:50 schrieb Alvin Starr <<a href="mailto:alvin@netvel.net" target="_blank" class="">alvin@netvel.net</a>>:
<blockquote type="cite" class=""><br class="gmail-m_34686457727802889Apple-interchange-newline">
<div class=""><span style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;float:none;display:inline" class="">In
general if no MTU is set on interface creation the default value is 1500.</span><br style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none" class="">
<br style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none" class="">
<span style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;float:none;display:inline" class="">On
OVS the bridge MTU is automatically set to the smallest port MTU. So you just have to set the MTU of each port of the bridge.</span><br style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none" class="">
<br style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none" class="">
<span style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;float:none;display:inline" class="">Take
a look at:<span class="gmail-m_34686457727802889Apple-converted-space"> </span></span><a href="https://bugzilla.redhat.com/show_bug.cgi?id=1160897" style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" target="_blank" class="">https://bugzilla.redhat.com/show_bug.cgi?id=1160897</a><br style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none" class="">
<span style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;float:none;display:inline" class="">It
is a bit of a pain to read but seems to confirm the statement about the OVS MTU value being set by the MTU of the ports.</span><br style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none" class="">
<br style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none" class="">
<span style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;float:none;display:inline" class="">I
have been using OVS with Xen and a few years ago I had to wrap my head around this problem.</span><br style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none" class="">
<span style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;float:none;display:inline" class="">Once
you start setting the MTU to something other than 1500 you will find you need to set ALL the MTU values of ALL your interfaces.</span><br style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none" class="">
<span style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;float:none;display:inline" class="">Otherwise
some inherited default will bite you.</span></div>
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