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I am assuming that the OP meant that his upstream is set to 1500

Jumbo frames has to be set end to end, all devices.

Otherwise you will be introducing more errors...


On 01/27/2014 05:32 PM, Li, Chen wrote:
>
> Hi Ageeleshwar,
>
>  
>
> I guess I just asked similar question yesterday.
>
>  
>
> But, I'm not understand what you mean "when your ethernet is limited
> to 1500".
>
>  
>
> Not sure if we're talking at the right direction.
>
> Anyway, here is what I know:
>
>  
>
> This is based on if you're using neutron + ovs.
>
>  
>
> 1.       Configure /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini
>
> veth_mtu = ${your_MTU}
>
>  
>
> If you're using gre/vxlan, this configure can be ignored.
>
>  
>
> 2.       Configure /etc/nova/nova.conf
>
> network_device_mtu= ${your_MTU}
>
>  
>
> But this may not work due to bug
> https://bugs.launchpad.net/nova/+bug/1260697.
>
> Unless you apply the fix patch.
>
>  
>
> 3.       Configure /etc/neutron/ dhcp_agent.ini
>
> dnsmasq_config_file = /etc/neutron/dnsmasq-neutron.conf
>
>  
>
> And add to /etc/neutron/dnsmasq-neutron.conf:
>
> dhcp-option-force=26,${your_MTU}
>
>  
>
>  
>
> I'm working under CentOS 6.4+ Havana + OVS + GRE.
>
> And I just tested it, It works fine to me.
>
> I have configured MTU=8500 in all configure files, while the physical
> NIC used for OVS (local IP) is using MTU=9000.
>
>  
>
> Thanks.
>
> -chen
>
>  
>
> *From:*Ageeleshwar Kandavelu [mailto:Ageeleshwar.Kandavelu at csscorp.com]
> *Sent:* Monday, January 27, 2014 9:57 PM
> *To:* Li, Chen
> *Cc:* openstack at lists.openstack.org
> *Subject:* [Openstack] How to enable jumbo frames for instances
>
>  
>
> Hi,
> Is it possible to have a higher MTU when your ethernet is limited to 1500?
>
> Thank you,
> Ageeleshwar K
>
> http://www.csscorp.com/common/email-disclaimer.php
>
>
>
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