[Rdo-list] Jumbo MTU to instances in Kilo?

Erich Weiler weiler at soe.ucsc.edu
Wed Oct 7 23:52:37 UTC 2015


Actually I was wrong, it WAS on the network node.  The virtual router 
interfaces were not set to MTU=9000.  On network node:

[root at os-net-01 ~]# ip netns
qdhcp-c395cff9-af7b-4456-91e3-3c55e6c2c5f5
qrouter-0b52e3a6-135c-4481-b286-7c96229f6555

i[root at os-net-01 ~]# ip netns exec 
qrouter-0b52e3a6-135c-4481-b286-7c96229f6555 ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
         inet 127.0.0.1  netmask 255.0.0.0
         inet6 ::1  prefixlen 128  scopeid 0x10<host>
         loop  txqueuelen 0  (Local Loopback)
         RX packets 0  bytes 0 (0.0 B)
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 0  bytes 0 (0.0 B)
         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

qg-fa1e2a28-25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
         inet 10.50.100.1  netmask 255.255.0.0  broadcast 10.50.255.255
         inet6 fe80::f816:3eff:fe6a:608b  prefixlen 64  scopeid 0x20<link>
         ether fa:16:3e:6a:60:8b  txqueuelen 0  (Ethernet)
         RX packets 34071065  bytes 5046408745 (4.6 GiB)
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 442  bytes 51915 (50.6 KiB)
         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

qr-51904c89-b8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
         inet 10.100.0.1  netmask 255.255.0.0  broadcast 10.100.255.255
         inet6 fe80::f816:3eff:fe37:eca6  prefixlen 64  scopeid 0x20<link>
         ether fa:16:3e:37:ec:a6  txqueuelen 0  (Ethernet)
         RX packets 702  bytes 75369 (73.6 KiB)
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 814  bytes 92259 (90.0 KiB)
         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

I can fix it manually:

[root at os-net-01 neutron]# ip netns exec 
qrouter-0b52e3a6-135c-4481-b286-7c96229f6555 ifconfig qg-fa1e2a28-25 mtu 
9000
[root at os-net-01 neutron]# ip netns exec 
qrouter-0b52e3a6-135c-4481-b286-7c96229f6555 ifconfig qr-51904c89-b8 mtu 
9000
[root at os-net-01 neutron]# ip netns exec 
qrouter-0b52e3a6-135c-4481-b286-7c96229f6555 ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
         inet 127.0.0.1  netmask 255.0.0.0
         inet6 ::1  prefixlen 128  scopeid 0x10<host>
         loop  txqueuelen 0  (Local Loopback)
         RX packets 0  bytes 0 (0.0 B)
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 0  bytes 0 (0.0 B)
         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

qg-fa1e2a28-25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
         inet 10.50.100.1  netmask 255.255.0.0  broadcast 10.50.255.255
         inet6 fe80::f816:3eff:fe6a:608b  prefixlen 64  scopeid 0x20<link>
         ether fa:16:3e:6a:60:8b  txqueuelen 0  (Ethernet)
         RX packets 34086053  bytes 5048637833 (4.7 GiB)
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 442  bytes 51915 (50.6 KiB)
         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

qr-51904c89-b8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
         inet 10.100.0.1  netmask 255.255.0.0  broadcast 10.100.255.255
         inet6 fe80::f816:3eff:fe37:eca6  prefixlen 64  scopeid 0x20<link>
         ether fa:16:3e:37:ec:a6  txqueuelen 0  (Ethernet)
         RX packets 702  bytes 75369 (73.6 KiB)
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 814  bytes 92259 (90.0 KiB)
         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

And then I have a jumbo clean path everywhere!  All is good then. 
But...  How to set this in a config file or something so I don't have to 
do it manually?

I found this bug report:

https://bugs.launchpad.net/neutron/+bug/1311097

Anyone know if that bug is still out there?  Or how can I set virtual 
router interfaces MTU by default when I create the router?

cheers,
erich

On 10/07/2015 04:35 PM, Erich Weiler wrote:
> Actually I think I'm closer - on the compute nodes, I set this in
> nova.conf:
>
> network_device_mtu=9000
>
> even though there was a big note above it that said not to use it
> because this option was deprecated.  But after setting that option, and
> restarting nova and openvswitch, br-int, my tap device and my qvb device
> all got set to MTU=9000.  So I'm closer!  But still one item is blocking
> me.  I show this tracepath from my controller node direct to the VM
> (which is on a compute node on the local network):
>
> # tracepath 10.50.100.4
>   1?: [LOCALHOST]                                         pmtu 9000
>   1:  10.50.100.4                                           0.682ms
>   1:  10.50.100.4                                           0.241ms
>   2:  10.50.100.4                                           0.297ms pmtu
> 1500
>   2:  10.50.100.4                                           1.664ms reached
>
> 10.50.100.4 is the VM.  It looks like the path is jumbo clean up until
> that third hop.  But the thing is, I don't know what the third hop is.  ;)
>
> On my compute node I still see some stuff with MTU=1500, but I'm not
> sure if one of those is blocking me:
>
> # ifconfig
> br-enp3s0f0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>          inet6 fe80::ec4:7aff:fe58:423e  prefixlen 64  scopeid 0x20<link>
>          ether 0c:c4:7a:58:42:3e  txqueuelen 0  (Ethernet)
>          RX packets 2401498  bytes 359284253 (342.6 MiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 30  bytes 1572 (1.5 KiB)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> br-int: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>          inet6 fe80::64dc:94ff:fe35:db4c  prefixlen 64  scopeid 0x20<link>
>          ether 66:dc:94:35:db:4c  txqueuelen 0  (Ethernet)
>          RX packets 133  bytes 12934 (12.6 KiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 8  bytes 648 (648.0 B)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> enp3s0f0: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 9000
>          inet6 fe80::ec4:7aff:fe58:423e  prefixlen 64  scopeid 0x20<link>
>          ether 0c:c4:7a:58:42:3e  txqueuelen 1000  (Ethernet)
>          RX packets 165957142  bytes 20333410092 (18.9 GiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 23299881  bytes 5950708819 (5.5 GiB)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> enp3s0f0.50: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>          inet 10.50.1.236  netmask 255.255.0.0  broadcast 10.50.255.255
>          inet6 fe80::ec4:7aff:fe58:423e  prefixlen 64  scopeid 0x20<link>
>          ether 0c:c4:7a:58:42:3e  txqueuelen 0  (Ethernet)
>          RX packets 6014767  bytes 813880745 (776.1 MiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 79301  bytes 19052451 (18.1 MiB)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
>          inet 127.0.0.1  netmask 255.0.0.0
>          inet6 ::1  prefixlen 128  scopeid 0x10<host>
>          loop  txqueuelen 0  (Local Loopback)
>          RX packets 22462729  bytes 1202484822 (1.1 GiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 22462729  bytes 1202484822 (1.1 GiB)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> qbr922bd9f5-bb: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>          inet6 fe80::4c1a:55ff:feba:14c3  prefixlen 64  scopeid 0x20<link>
>          ether 56:a6:a6:db:83:c4  txqueuelen 0  (Ethernet)
>          RX packets 16  bytes 1520 (1.4 KiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 8  bytes 648 (648.0 B)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> qbrf42ea01f-fe: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>          inet6 fe80::f484:f1ff:fe53:fb2e  prefixlen 64  scopeid 0x20<link>
>          ether c2:a6:d8:25:63:ea  txqueuelen 0  (Ethernet)
>          RX packets 15  bytes 1456 (1.4 KiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 8  bytes 648 (648.0 B)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> qvb922bd9f5-bb: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu
> 9000
>          inet6 fe80::54a6:a6ff:fedb:83c4  prefixlen 64  scopeid 0x20<link>
>          ether 56:a6:a6:db:83:c4  txqueuelen 1000  (Ethernet)
>          RX packets 86  bytes 9610 (9.3 KiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 133  bytes 12767 (12.4 KiB)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> qvbf42ea01f-fe: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu
> 1500
>          inet6 fe80::c0a6:d8ff:fe25:63ea  prefixlen 64  scopeid 0x20<link>
>          ether c2:a6:d8:25:63:ea  txqueuelen 1000  (Ethernet)
>          RX packets 377  bytes 57664 (56.3 KiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 333  bytes 38765 (37.8 KiB)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> qvo922bd9f5-bb: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu
> 9000
>          inet6 fe80::b44a:bff:fe72:aaea  prefixlen 64  scopeid 0x20<link>
>          ether b6:4a:0b:72:aa:ea  txqueuelen 1000  (Ethernet)
>          RX packets 133  bytes 12767 (12.4 KiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 86  bytes 9610 (9.3 KiB)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> qvof42ea01f-fe: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu
> 1500
>          inet6 fe80::f03e:35ff:fefe:e52  prefixlen 64  scopeid 0x20<link>
>          ether f2:3e:35:fe:0e:52  txqueuelen 1000  (Ethernet)
>          RX packets 333  bytes 38765 (37.8 KiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 377  bytes 57664 (56.3 KiB)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> tap922bd9f5-bb: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>          inet6 fe80::fc16:3eff:fefa:9945  prefixlen 64  scopeid 0x20<link>
>          ether fe:16:3e:fa:99:45  txqueuelen 500  (Ethernet)
>          RX packets 118  bytes 11561 (11.2 KiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 95  bytes 10316 (10.0 KiB)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
>          inet 192.168.122.1  netmask 255.255.255.0  broadcast
> 192.168.122.255
>          ether 52:54:00:c4:75:9f  txqueuelen 0  (Ethernet)
>          RX packets 0  bytes 0 (0.0 B)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 0  bytes 0 (0.0 B)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> My network node has all interfaces set to MTU=9000.  I thought maybe the
> bottleneck might be there but I don't think it is.   Here's ifconfig
> from my network node:
>
> # ifconfig
> lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
>          inet 127.0.0.1  netmask 255.0.0.0
>          inet6 ::1  prefixlen 128  scopeid 0x10<host>
>          loop  txqueuelen 0  (Local Loopback)
>          RX packets 2042  bytes 238727 (233.1 KiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 2042  bytes 238727 (233.1 KiB)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> p1p2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>          inet6 fe80::207:43ff:fe10:deb8  prefixlen 64  scopeid 0x20<link>
>          ether 00:07:43:10:de:b8  txqueuelen 1000  (Ethernet)
>          RX packets 2156053308  bytes 325330839639 (302.9 GiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 223004  bytes 24769304 (23.6 MiB)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>          device interrupt 72
>
> p2p1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>          inet 10.50.1.51  netmask 255.255.0.0  broadcast 10.50.255.255
>          inet6 fe80::260:ddff:fe44:2aea  prefixlen 64  scopeid 0x20<link>
>          ether 00:60:dd:44:2a:ea  txqueuelen 1000  (Ethernet)
>          RX packets 49352916  bytes 3501547231 (3.2 GiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 18876911  bytes 3768900461 (3.5 GiB)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> p2p2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>          inet6 fe80::260:ddff:fe44:2aeb  prefixlen 64  scopeid 0x20<link>
>          ether 00:60:dd:44:2a:eb  txqueuelen 1000  (Ethernet)
>          RX packets 2491224974  bytes 348058319500 (324.1 GiB)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 1597  bytes 204525 (199.7 KiB)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> Any way I can figure out what the third hop is from my tracepath?
>
> Thanks as always for the sage advice!
>
> -erich
>
> On 10/07/2015 09:57 AM, Erich Weiler wrote:
>> Yeah, I made the changes and then recreated all the networks.  For some
>> reason br-int and the individual virtual instance interfaces on the
>> compute node still show 1500 byte frames.
>>
>> Has anyone else configured jumbo frames in a Kilo environment?  Or maybe
>> I'm just an outlier...  ;)
>>
>> -erich
>>
>> On 10/07/2015 01:46 AM, Pedro Navarro Perez wrote:
>>> Hi Erich,
>>>
>>> did you recreate the neutron networks after the configuration changes?
>>>
>>> Pedro Navarro Pérez
>>> OpenStack product specialist
>>> Red Hat Iberia
>>> Passeig de Gràcia 120,
>>> 08008 Barcelona
>>> Spain
>>> M +34 639 642 379
>>> E pnavarro at redhat.com
>>>
>>> ----- Original Message -----
>>> From: "Erich Weiler" <weiler at soe.ucsc.edu>
>>> To: rdo-list at redhat.com
>>> Sent: Wednesday, 7 October, 2015 2:34:28 AM
>>> Subject: [Rdo-list] Jumbo MTU to instances in Kilo?
>>>
>>> Hi Y'all,
>>>
>>> I know someone must have figured this one out, but I can't seem to get
>>> 9000 byte MTUs working.  I have it set in plugin.ini, etc, my nodes have
>>> MTU=9000 on their interfaces, so does the network node.  dnsmasq also is
>>> configured to set MTU=9000 on instances, which works.  But I still can't
>>> ping with large packets to my instance:
>>>
>>> [weiler at stacker ~]$ ping 10.50.100.2
>>> PING 10.50.100.2 (10.50.100.2) 56(84) bytes of data.
>>> 64 bytes from 10.50.100.2: icmp_seq=1 ttl=63 time=2.95 ms
>>> 64 bytes from 10.50.100.2: icmp_seq=2 ttl=63 time=1.14 ms
>>> 64 bytes from 10.50.100.2: icmp_seq=3 ttl=63 time=0.661 ms
>>>
>>> That works fine.  This however doesn't work:
>>>
>>> [root at stacker ~]# ping -M do -s 8000 10.50.100.2
>>> PING 10.50.100.2 (10.50.100.2) 8000(8028) bytes of data.
>>>   From 10.50.100.2 icmp_seq=1 Frag needed and DF set (mtu = 1500)
>>> ping: local error: Message too long, mtu=1500
>>> ping: local error: Message too long, mtu=1500
>>> ping: local error: Message too long, mtu=1500
>>> ping: local error: Message too long, mtu=1500
>>>
>>> It looks like somehow the br-int interface for OVS isn't set at 9000,
>>> but I can't figure out how to do that...
>>>
>>> Here's ifconfig on my compute node:
>>>
>>> br-enp3s0f0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>>>           inet6 fe80::ec4:7aff:fe58:423e  prefixlen 64  scopeid
>>> 0x20<link>
>>>           ether 0c:c4:7a:58:42:3e  txqueuelen 0  (Ethernet)
>>>           RX packets 2401432  bytes 359276713 (342.6 MiB)
>>>           RX errors 0  dropped 0  overruns 0  frame 0
>>>           TX packets 30  bytes 1572 (1.5 KiB)
>>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>>
>>> br-int: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>>>           inet6 fe80::64dc:94ff:fe35:db4c  prefixlen 64  scopeid
>>> 0x20<link>
>>>           ether 66:dc:94:35:db:4c  txqueuelen 0  (Ethernet)
>>>           RX packets 69  bytes 6866 (6.7 KiB)
>>>           RX errors 0  dropped 0  overruns 0  frame 0
>>>           TX packets 8  bytes 648 (648.0 B)
>>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>>
>>> enp3s0f0: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 9000
>>>           inet6 fe80::ec4:7aff:fe58:423e  prefixlen 64  scopeid
>>> 0x20<link>
>>>           ether 0c:c4:7a:58:42:3e  txqueuelen 1000  (Ethernet)
>>>           RX packets 130174458  bytes 15334807929 (14.2 GiB)
>>>           RX errors 0  dropped 0  overruns 0  frame 0
>>>           TX packets 22919305  bytes 5859090420 (5.4 GiB)
>>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>>
>>> enp3s0f0.50: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>>>           inet 10.50.1.236  netmask 255.255.0.0  broadcast 10.50.255.255
>>>           inet6 fe80::ec4:7aff:fe58:423e  prefixlen 64  scopeid
>>> 0x20<link>
>>>           ether 0c:c4:7a:58:42:3e  txqueuelen 0  (Ethernet)
>>>           RX packets 38429352  bytes 5152853436 (4.7 GiB)
>>>           RX errors 0  dropped 0  overruns 0  frame 0
>>>           TX packets 419842  bytes 101161981 (96.4 MiB)
>>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>>
>>> lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
>>>           inet 127.0.0.1  netmask 255.0.0.0
>>>           inet6 ::1  prefixlen 128  scopeid 0x10<host>
>>>           loop  txqueuelen 0  (Local Loopback)
>>>           RX packets 22141566  bytes 1185622090 (1.1 GiB)
>>>           RX errors 0  dropped 0  overruns 0  frame 0
>>>           TX packets 22141566  bytes 1185622090 (1.1 GiB)
>>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>>
>>> qbr247da3ed-a4: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>>>           inet6 fe80::5c8f:c0ff:fe79:bc11  prefixlen 64  scopeid
>>> 0x20<link>
>>>           ether b6:1f:54:3f:3d:48  txqueuelen 0  (Ethernet)
>>>           RX packets 16  bytes 1472 (1.4 KiB)
>>>           RX errors 0  dropped 0  overruns 0  frame 0
>>>           TX packets 8  bytes 648 (648.0 B)
>>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>>
>>> qbrf42ea01f-fe: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>>>           inet6 fe80::f484:f1ff:fe53:fb2e  prefixlen 64  scopeid
>>> 0x20<link>
>>>           ether c2:a6:d8:25:63:ea  txqueuelen 0  (Ethernet)
>>>           RX packets 15  bytes 1456 (1.4 KiB)
>>>           RX errors 0  dropped 0  overruns 0  frame 0
>>>           TX packets 8  bytes 648 (648.0 B)
>>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>>
>>> qvb247da3ed-a4: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>
>>> mtu 1500
>>>           inet6 fe80::b41f:54ff:fe3f:3d48  prefixlen 64  scopeid
>>> 0x20<link>
>>>           ether b6:1f:54:3f:3d:48  txqueuelen 1000  (Ethernet)
>>>           RX packets 247  bytes 28323 (27.6 KiB)
>>>           RX errors 0  dropped 0  overruns 0  frame 0
>>>           TX packets 233  bytes 25355 (24.7 KiB)
>>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>>
>>> qvbf42ea01f-fe: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>
>>> mtu 1500
>>>           inet6 fe80::c0a6:d8ff:fe25:63ea  prefixlen 64  scopeid
>>> 0x20<link>
>>>           ether c2:a6:d8:25:63:ea  txqueuelen 1000  (Ethernet)
>>>           RX packets 377  bytes 57664 (56.3 KiB)
>>>           RX errors 0  dropped 0  overruns 0  frame 0
>>>           TX packets 333  bytes 38765 (37.8 KiB)
>>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>>
>>> qvo247da3ed-a4: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>
>>> mtu 1500
>>>           inet6 fe80::dcfa:f1ff:fe03:ee88  prefixlen 64  scopeid
>>> 0x20<link>
>>>           ether de:fa:f1:03:ee:88  txqueuelen 1000  (Ethernet)
>>>           RX packets 233  bytes 25355 (24.7 KiB)
>>>           RX errors 0  dropped 0  overruns 0  frame 0
>>>           TX packets 247  bytes 28323 (27.6 KiB)
>>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>>
>>> qvof42ea01f-fe: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>
>>> mtu 1500
>>>           inet6 fe80::f03e:35ff:fefe:e52  prefixlen 64  scopeid
>>> 0x20<link>
>>>           ether f2:3e:35:fe:0e:52  txqueuelen 1000  (Ethernet)
>>>           RX packets 333  bytes 38765 (37.8 KiB)
>>>           RX errors 0  dropped 0  overruns 0  frame 0
>>>           TX packets 377  bytes 57664 (56.3 KiB)
>>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>>
>>> tap247da3ed-a4: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>>>           inet6 fe80::fc16:3eff:fede:5eea  prefixlen 64  scopeid
>>> 0x20<link>
>>>           ether fe:16:3e:de:5e:ea  txqueuelen 500  (Ethernet)
>>>           RX packets 219  bytes 24239 (23.6 KiB)
>>>           RX errors 0  dropped 0  overruns 0  frame 0
>>>           TX packets 224  bytes 26661 (26.0 KiB)
>>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>>
>>> virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
>>>           inet 192.168.122.1  netmask 255.255.255.0  broadcast
>>> 192.168.122.255
>>>           ether 52:54:00:c4:75:9f  txqueuelen 0  (Ethernet)
>>>           RX packets 0  bytes 0 (0.0 B)
>>>           RX errors 0  dropped 0  overruns 0  frame 0
>>>           TX packets 0  bytes 0 (0.0 B)
>>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>>
>>> This is on RHEL 7.1.  Any obvious way I can get all the intermediate
>>> bridges to MTU=9000?  I've RTFM'd and googled to no avail...
>>>
>>> Here's the ovs-vsctl outout:
>>>
>>> [root at node-136 ~]# ovs-vsctl show
>>> 6f5a5f00-59e2-4420-aeaf-7ad464ead232
>>>       Bridge br-int
>>>           fail_mode: secure
>>>           Port br-int
>>>               Interface br-int
>>>                   type: internal
>>>           Port "qvo247da3ed-a4"
>>>               tag: 1
>>>               Interface "qvo247da3ed-a4"
>>>           Port "int-br-eth1"
>>>               Interface "int-br-eth1"
>>>           Port "int-br-enp3s0f0"
>>>               Interface "int-br-enp3s0f0"
>>>                   type: patch
>>>                   options: {peer="phy-br-enp3s0f0"}
>>>       Bridge "br-enp3s0f0"
>>>           Port "enp3s0f0"
>>>               Interface "enp3s0f0"
>>>           Port "br-enp3s0f0"
>>>               Interface "br-enp3s0f0"
>>>                   type: internal
>>>           Port "phy-br-enp3s0f0"
>>>               Interface "phy-br-enp3s0f0"
>>>                   type: patch
>>>                   options: {peer="int-br-enp3s0f0"}
>>>       ovs_version: "2.3.1"
>>>
>>> Many thanks if anyone has any information on this topic!  Or can point
>>> me to some documentation I missed...
>>>
>>> Thanks,
>>> erich
>>>
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>>> Rdo-list at redhat.com
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