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[Deepika <deepika@xxxxxxxxx>]

Public bug reported:

When running the Network basic tempest test in a multi node testbed with
MTU feature enabled and Vxlan overlay failed with the following error :

[00mStderr: RTNETLINK answers: No buffer space available
ESC[01;31m2015-07-14 19:35:07.838 TRACE neutron.agent.l3.router_info ESC[01;35mESC[00m
ESC[01;31m2015-07-14 19:35:07.838 TRACE neutron.agent.l3.router_info ESC[01;35mESC[00m
2015-07-14 19:35:07.842 ESC[01;31mERROR neutron.agent.l3.agent [ESC[00;36m-ESC[01;31m] ESC[01;35mESC[01;31mFailed to process compatible router 'd280eae2-52ec-4fe6-9af4-46008509bc5a'ESC[00m


Testbed :

- master (7/15/15)
- multinode - node1 - controller ; node2 - compute
- MTU feature enabled
- Vxlan overlay


The Controller local.con details are :

localadmin@devstack-server00:~/devstack$ more local.conf 
[[local|localrc]]
ADMIN_PASSWORD=Cisco123
SERVICE_TOKEN=$ADMIN_PASSWORD
DATABASE_PASSWORD=$ADMIN_PASSWORD
RABBIT_PASSWORD=$ADMIN_PASSWORD
SERVICE_PASSWORD=$ADMIN_PASSWORD
MYSQL_PASSWORD=$ADMIN_PASSWORD
SERVICE_TOKEN=1112f596-76f3-11e3-b3b2-e716f9080d50
NOVA_USE_QUANTUM_API=v3
LOGFILE=$DEST/stack.sh.log
VERBOSE=True
DEBUG=True
USE_SCREEN=True
SCREEN_LOGDIR=$DEST/logs
API_RATE_LIMIT=False
FIXED_RANGE_V6=2001:dead:beef:deed::/64
IPV6_PRIVATE_NETWORK_GATEWAY=2001:dead:beef:deed::1
IMAGE_URLS='http://172.29.173.233/cirros-0.3.3-x86_64-uec.tar.gz,http://172.29.173.233/trusty-server-cloudimg-amd64-disk1.img'
CIRROS_VERSION=0.3.3
SWIFT_REPLICAS=1
SWIFT_HASH=011688b44136573e209e
MULTI_HOST=True
HOST_IP=192.168.10.2
enable_service g-api g-reg key n-api n-crt n-obj n-cpu n-cond cinder c-sch
enable_service c-api c-vol n-sch n-novnc n-xvnc n-cauth horizon rabbit
enable_service mysql q-svc q-agt q-l3 q-dhcp q-meta q-lbaas q-vpn q-fwaas q-metering neutron
disable_service n-net
enable_service s-proxy s-object s-container s-account
enable_service tempest
TEMPEST_REPO=https://github.com/CiscoSystems/tempest.git
TEMPEST_BRANCH=ipv6
#enable_service tempest
TEMPEST_REPO=https://github.com/cisco-openstack/tempest.git
TEMPEST_BRANCH=proposed
[[post-config|/etc/neutron/neutron.conf]]
[DEFAULT]
advertise_mtu = True
network_device_mtu = 1200
[[post-config|/etc/nova/nova.conf]]
[DEFAULT]
network_device_mtu = 1200
[[post-config|/etc/neutron/plugins/ml2/ml2_conf.ini]]
[ml2]
segment_mtu = 1200
path_mtu = 1200

** Affects: neutron
     Importance: Undecided
         Status: New

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Engineering Team, which is subscribed to neutron.
https://bugs.launchpad.net/bugs/1475015

Title:
  "RTNETLINK answers: No buffer space available" error seen using MTU
  advertisement feature with VxLAN overlay

Status in neutron:
  New

Bug description:
  When running the Network basic tempest test in a multi node testbed
  with MTU feature enabled and Vxlan overlay failed with the following
  error :

  [00mStderr: RTNETLINK answers: No buffer space available
  ESC[01;31m2015-07-14 19:35:07.838 TRACE neutron.agent.l3.router_info ESC[01;35mESC[00m
  ESC[01;31m2015-07-14 19:35:07.838 TRACE neutron.agent.l3.router_info ESC[01;35mESC[00m
  2015-07-14 19:35:07.842 ESC[01;31mERROR neutron.agent.l3.agent [ESC[00;36m-ESC[01;31m] ESC[01;35mESC[01;31mFailed to process compatible router 'd280eae2-52ec-4fe6-9af4-46008509bc5a'ESC[00m

  
  Testbed :

  - master (7/15/15)
  - multinode - node1 - controller ; node2 - compute
  - MTU feature enabled
  - Vxlan overlay

  
  The Controller local.con details are :

  localadmin@devstack-server00:~/devstack$ more local.conf 
  [[local|localrc]]
  ADMIN_PASSWORD=Cisco123
  SERVICE_TOKEN=$ADMIN_PASSWORD
  DATABASE_PASSWORD=$ADMIN_PASSWORD
  RABBIT_PASSWORD=$ADMIN_PASSWORD
  SERVICE_PASSWORD=$ADMIN_PASSWORD
  MYSQL_PASSWORD=$ADMIN_PASSWORD
  SERVICE_TOKEN=1112f596-76f3-11e3-b3b2-e716f9080d50
  NOVA_USE_QUANTUM_API=v3
  LOGFILE=$DEST/stack.sh.log
  VERBOSE=True
  DEBUG=True
  USE_SCREEN=True
  SCREEN_LOGDIR=$DEST/logs
  API_RATE_LIMIT=False
  FIXED_RANGE_V6=2001:dead:beef:deed::/64
  IPV6_PRIVATE_NETWORK_GATEWAY=2001:dead:beef:deed::1
  IMAGE_URLS='http://172.29.173.233/cirros-0.3.3-x86_64-uec.tar.gz,http://172.29.173.233/trusty-server-cloudimg-amd64-disk1.img'
  CIRROS_VERSION=0.3.3
  SWIFT_REPLICAS=1
  SWIFT_HASH=011688b44136573e209e
  MULTI_HOST=True
  HOST_IP=192.168.10.2
  enable_service g-api g-reg key n-api n-crt n-obj n-cpu n-cond cinder c-sch
  enable_service c-api c-vol n-sch n-novnc n-xvnc n-cauth horizon rabbit
  enable_service mysql q-svc q-agt q-l3 q-dhcp q-meta q-lbaas q-vpn q-fwaas q-metering neutron
  disable_service n-net
  enable_service s-proxy s-object s-container s-account
  enable_service tempest
  TEMPEST_REPO=https://github.com/CiscoSystems/tempest.git
  TEMPEST_BRANCH=ipv6
  #enable_service tempest
  TEMPEST_REPO=https://github.com/cisco-openstack/tempest.git
  TEMPEST_BRANCH=proposed
  [[post-config|/etc/neutron/neutron.conf]]
  [DEFAULT]
  advertise_mtu = True
  network_device_mtu = 1200
  [[post-config|/etc/nova/nova.conf]]
  [DEFAULT]
  network_device_mtu = 1200
  [[post-config|/etc/neutron/plugins/ml2/ml2_conf.ini]]
  [ml2]
  segment_mtu = 1200
  path_mtu = 1200

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