Certainly in VPP 17.01 jumbo frames were not handled properly by VPP and in our application we had to reset the MTU in VPP to be 1500 via something like:
set interface mtu 1500 device_37/0/0 Greg From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of John Lo (loj) via Lists.Fd.Io Sent: 26 February 2020 14:47 To: Dave Barach (dbarach) <dbar...@cisco.com>; vpp-dev <vpp-dev@lists.fd.io> Cc: vpp-dev@lists.fd.io Subject: Re: [vpp-dev] Change interface default MTU to 1500 Hi Dave, My memory was that in data center or cloud environment it is desirable to set MTU to jumbo frame size to avoid fragmentation by default. Thus the question would be if it is reasonable to set default MTU size to 9000 for VPP and what kind of problem is it causing that would be fixed by changing it to 1500. Regards, John From: vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io> <vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>> On Behalf Of Dave Barach via Lists.Fd.Io Sent: Wednesday, February 26, 2020 8:40 AM To: vpp-dev <vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>> Cc: vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io> Subject: [vpp-dev] Change interface default MTU to 1500 Folks, I'm considering changing the default interface MTU to 1500, from the current value of 9000: ethernet_register_interface (...) { <snip> /* Standard default ethernet MTU. */ vnet_sw_interface_set_mtu (vnm, hi->sw_if_index, 9000); <snip> } I've pinged some folks, and nobody remembers why we're setting the default MTU to 9000. Thanks... Dave This message, including attachments, is CONFIDENTIAL. It may also be privileged or otherwise protected by law. If you received this email by mistake please let us know by reply and then delete it from your system; you should not copy it or disclose its contents to anyone. All messages sent to and from Enea may be monitored to ensure compliance with internal policies and to protect our business. Emails are not secure and cannot be guaranteed to be error free as they can be intercepted, a mended, lost or destroyed, or contain viruses. The sender therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of email transmission. Anyone who communicates with us by email accepts these risks.
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