Reviewed: https://review.openstack.org/283790
Committed:
https://git.openstack.org/cgit/openstack/neutron/commit/?id=4df8d9a7016ab20fce235833d792b89309ec98a7
Submitter: Jenkins
Branch: master
commit 4df8d9a7016ab20fce235833d792b89309ec98a7
Author: Kevin Benton <ke...@benton.pub>
Date: Mon Feb 22 16:41:45 2016 -0800
Make agent interface plugging utilize network MTU
This changes the 'plug' and 'plug_new' interfaces of the
LinuxInterfaceDriver to accept an MTU argument. It then
updates the dhcp agent and l3 agent to pass the MTU that
is set on the network that the port belongs to. This allows
it to take into account the overhead calculations that are
done for encapsulation types.
It's necessary for the L3 agent to have the MTU because it
must recognize when fragmentation is needed so it can fragment
or generate an ICMP error.
It's necessary for the DHCP agent to have the MTU so it doesn't
interfere when it plugs into a bridge with a larger than 1500
MTU (the bridge would reduce its MTU to match the agent).
If an operator sets 'network_device_mtu', the value of that
will be used instead to preserve previous behavior.
Closes-Bug: #1549470
Closes-Bug: #1542108
Closes-Bug: #1542475
DocImpact: Neutron agents now support arbitrary MTU
configurations on each network (including
jumbo frames). This is accomplished by checking
the MTU value defined for each network on which
it is wiring VIFs.
Co-Authored-By: Matt Kassawara <mkassaw...@gmail.com>
Change-Id: Ic091fa78dfd133179c71cbc847bf955a06cb248a
** Changed in: neutron
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1549470
Title:
Neutron agents do not use network MTU
Status in neutron:
Fix Released
Bug description:
The Neutron agents do not use the MTU set in the network object for
their interfaces. This prevents the L3 and DHCP agents from being
compatible with networks with jumbo frames and it causes them to
transmit packets larger than the network's MTU onto the network where
they will be dropped instead of correctly fragmenting, generating an
ICMP error; or, in the case of the DHCP agent, reducing the MSS for
its traffic.
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