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[Bug 1823798] [NEW] rfp and fpr interfaces not updated after changing network MTU

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Arjun Baindur <xagent@xxxxxxxxx>
Date: Mon, 08 Apr 2019 21:47:49 -0000
Reply-to: Bug 1823798 <1823798@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

I have a tenant network attached to a router and external network, and
some VMs with Floating IPs deployed. I updated the network MTU from 1500
to 1300 (just as a test, but try any other MTU), and restarted nova
compute, ovs agent, l3-agent.

All interfaces (qvo/qvb/qbr, qr, dhcp taps, sg, fg, qg) got updated
except for the rfp-fpr peer link between qrouter and fip namespace:

[root@dvr-tn-vl-c7-10-4-211-218platform9 ~]# ifconfig | grep mtu
br-ex: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
ens32: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
ens34: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
ens35: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
ens34.1801: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
qbr05d85481-ca: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
qbr147c3499-25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
qbrbf9399bf-17: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
qbrf1ba8ee0-e1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
qvb05d85481-ca: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
qvb147c3499-25: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
qvbbf9399bf-17: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
qvbf1ba8ee0-e1: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
qvo05d85481-ca: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
qvo147c3499-25: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
qvobf9399bf-17: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
qvof1ba8ee0-e1: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
tap05d85481-ca: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
tap147c3499-25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
tapbf9399bf-17: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
tapf1ba8ee0-e1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
[root@dvr-tn-vl-c7-10-4-211-218platform9 ~]# ip netns exec qrouter-b57abb6d-92ff-4ebd-a71f-6b26646eddfa ifconfig | grep mtu
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
qr-9f725d28-82: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
qr-a9852f10-d1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
rfp-b57abb6d-9: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
[root@dvr-tn-vl-c7-10-4-211-218platform9 ~]# ip netns exec qdhcp-ada1b967-9604-42ea-88bc-d887ce3e877e ifconfig | grep mtu
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
tap8ecd0a51-63: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
[root@dvr-tn-vl-c7-10-4-211-218platform9 ~]# ip netns exec fip-4ff6386b-c547-465e-a734-49eed1ae6832 ifconfig | grep mtu
fg-a7668bc9-97: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
fpr-b57abb6d-9: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
[root@dvr-tn-vl-c7-10-4-211-218platform9 ~]# ip netns exec snat-b57abb6d-92ff-4ebd-a71f-6b26646eddfa ifconfig | grep mtu
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
qg-d69632ce-e4: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
sg-83643ed0-34: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
sg-9eac9eee-69: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300


VM taps are still at 1500, but will change if I powercycle VMs or migrate. rfp/fprs remain at 1500 and unsure of how to get their MTUs to update

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: l3-dvr-backlog

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https://bugs.launchpad.net/bugs/1823798

Title:
  rfp and fpr interfaces not updated after changing network MTU

Status in neutron:
  New

Bug description:
  I have a tenant network attached to a router and external network, and
  some VMs with Floating IPs deployed. I updated the network MTU from
  1500 to 1300 (just as a test, but try any other MTU), and restarted
  nova compute, ovs agent, l3-agent.

  All interfaces (qvo/qvb/qbr, qr, dhcp taps, sg, fg, qg) got updated
  except for the rfp-fpr peer link between qrouter and fip namespace:

  [root@dvr-tn-vl-c7-10-4-211-218platform9 ~]# ifconfig | grep mtu
  br-ex: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
  ens32: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
  ens34: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
  ens35: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
  ens34.1801: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
  lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
  qbr05d85481-ca: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
  qbr147c3499-25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
  qbrbf9399bf-17: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
  qbrf1ba8ee0-e1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
  qvb05d85481-ca: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
  qvb147c3499-25: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
  qvbbf9399bf-17: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
  qvbf1ba8ee0-e1: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
  qvo05d85481-ca: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
  qvo147c3499-25: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
  qvobf9399bf-17: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
  qvof1ba8ee0-e1: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1300
  tap05d85481-ca: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
  tap147c3499-25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
  tapbf9399bf-17: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
  tapf1ba8ee0-e1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
  virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
  [root@dvr-tn-vl-c7-10-4-211-218platform9 ~]# ip netns exec qrouter-b57abb6d-92ff-4ebd-a71f-6b26646eddfa ifconfig | grep mtu
  lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
  qr-9f725d28-82: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
  qr-a9852f10-d1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
  rfp-b57abb6d-9: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
  [root@dvr-tn-vl-c7-10-4-211-218platform9 ~]# ip netns exec qdhcp-ada1b967-9604-42ea-88bc-d887ce3e877e ifconfig | grep mtu
  lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
  tap8ecd0a51-63: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
  [root@dvr-tn-vl-c7-10-4-211-218platform9 ~]# ip netns exec fip-4ff6386b-c547-465e-a734-49eed1ae6832 ifconfig | grep mtu
  fg-a7668bc9-97: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
  fpr-b57abb6d-9: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
  lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
  [root@dvr-tn-vl-c7-10-4-211-218platform9 ~]# ip netns exec snat-b57abb6d-92ff-4ebd-a71f-6b26646eddfa ifconfig | grep mtu
  lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
  qg-d69632ce-e4: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
  sg-83643ed0-34: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300
  sg-9eac9eee-69: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1300

  
  VM taps are still at 1500, but will change if I powercycle VMs or migrate. rfp/fprs remain at 1500 and unsure of how to get their MTUs to update

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Follow ups

[Bug 1823798] Re: rfp and fpr interfaces not updated after changing network MTU
From: OpenStack Infra, 2019-04-12