Operating System: All
Platform: All

(In reply to Revital Aronis from comment #0)
> Hi,
> Due to the csit change that was merged yesterday, that added provider vlan
> testing,
> tempest.scenario.test_network_basic_ops.TestNetworkBasicOps.
> test_mtu_sized_frames started failing all the time.
> This because of incompatibility between the mtu of the ping request tempest
> sends, and the mtu of tempest external network that was changed because it
> is now a vlan network.
>
> We will skip this test across versions, and try to come up with a fix ASAP.
>
> https://jenkins.opendaylight.org/releng/view/netvirt-csit/job/netvirt-csit-
> 1node-openstack-newton-nodl-v2-upstream-learn-carbon/176/

I tried to poke around a little bit. The vlan network we create for tempest
is using mtu 1440, like we expect from our config right:

network:
https://logs.opendaylight.org/releng/jenkins092/netvirt-csit-1node-openstack-mitaka-upstream-learn-boron/264/archives/log.html.gz#s1-s2-s1-k1-k5-k5

config:
https://github.com/opendaylight/releng-builder/blob/master/jjb/integration/include-raw-integration-deploy-openstack-run-test.sh#L195

I glanced at the tempest code and it implies that it will try it's ping using
the network mtu which should be 1440. If that ping is failing, then is something
in the network adding even more encaps? I know the math says it should only
add up to 1494 which is less than our 1500 on the nics. Is there something
we are forgetting?

BUT, I changed the job to use 1200 for the network mtu and it's passing.

https://logs.opendaylight.org/sandbox/jenkins091/netvirt-csit-1node-openstack-mitaka-jamo-upstream-stateful-carbon/11/archives/log.html.gz#s1-s2-s1-k1-k4-k5