yahoo-eng-team team mailing list archive

[Rodolfo Alonso <1951517@xxxxxxxxxxxxxxxxxx>]

Hello Mikhail:

"max_tunid" is a read only parameter set by OVN (Neutron can only read
it). It is used to determine the capacity of the cluster depending on
the tunnel types enabled for encapsulation.

This option is useful only when VXLAN is enabled, due to limitations in
the protocol header. For more info, please read [1].

In a nutshell, if you allow VXLAN, then the "max_tunid" value will be
reduced to 4095. If not, the value will be 16711680 (0xFF0000).

Regards.

[1]https://www.mail-archive.com/ovs-discuss@xxxxxxxxxxxxxxx/msg06771.html
 

** Changed in: neutron
       Status: New => Invalid

-- 
You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to neutron.
https://bugs.launchpad.net/bugs/1951517

Title:
  Segmentation ID should be lower or equal to 4095

Status in neutron:
  Invalid

Bug description:
  Hi,

  I am trying to set up OVN using Openstack.

  OS: CentOS Stream release 8
  OVN 21.06
  Openstack wallaby

  When creating a network in openstack, we get an error:

  "Segmentation ID should be lower or equal to 4095."

  ml2 config:

  # ML2 general
  [ml2]
  type_drivers = flat,vlan,vxlan,geneve
  tenant_network_types = geneve
  mechanism_drivers = ovn
  extension_drivers = port_security,dns
  physical_network_mtus = vlan:1500,floating:1500
  path_mtu = 1558
  overlay_ip_version = 4

  # ML2 geneve networks
  [ml2_type_geneve]
  vni_ranges = 5000:6000
  max_header_size = 38

  # ML2 VLAN networks
  [ml2_type_vlan]
  network_vlan_ranges = vlan:3900:3999

  # ML2 VXLAN networks
  [ml2_type_vxlan]
  vni_ranges = 5000:6000

  
  # Security groups
  [securitygroup]
  enable_security_group = True
  firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver

  [ovn]
  ovn_nb_connection = tcp:<IP>:6641
  ovn_sb_connection = tcp:<IP>:6642
  ovn_l3_scheduler = leastloaded
  ovn_metadata_enabled = True
  isolated_metadata = True

  
  When I execute the command
  $ ovn-nbctl get NB_Global. options:max_tunid
  or
  $ ovn-sbctl get SB_Global. options:max_tunid
  I get "4095"

  If I manually try to change max_tunid using the command
  $ ovn-nbctl set NB_Global. options:max_tunid="16777215"
  or
  $ ovn-sbctl set SB_Global. options:max_tunid="16777215"
  then no change occurs.

  How can I change max_tunid from 4095 to 16777215 for supporting geneve
  or vxlan networks in Openstack.

To manage notifications about this bug go to:
https://bugs.launchpad.net/neutron/+bug/1951517/+subscriptions