ml2_conf.ini

DEFAULT

debug

Type:

boolean

Default:

False

Mutable:

This option can be changed without restarting.

If set to true, the logging level will be set to DEBUG instead of the default INFO level.

log_config_append

Type:

string

Default:

<None>

Mutable:

This option can be changed without restarting.

The name of a logging configuration file. This file is appended to any existing logging configuration files. For details about logging configuration files, see the Python logging module documentation. Note that when logging configuration files are used then all logging configuration is set in the configuration file and other logging configuration options are ignored (for example, log-date-format).

Deprecated Variations

Group	Name
DEFAULT	log-config
DEFAULT	log_config

log_date_format

Type:

string

Default:

%Y-%m-%d %H:%M:%S

Defines the format string for %(asctime)s in log records. Default: the value above . This option is ignored if log_config_append is set.

log_file

Type:

string

Default:

<None>

(Optional) Name of log file to send logging output to. If no default is set, logging will go to stderr as defined by use_stderr. This option is ignored if log_config_append is set.

Deprecated Variations

Group	Name
DEFAULT	logfile

log_dir

Type:

string

Default:

<None>

(Optional) The base directory used for relative log_file paths. This option is ignored if log_config_append is set.

Deprecated Variations

Group	Name
DEFAULT	logdir

watch_log_file

Type:

boolean

Default:

False

Uses logging handler designed to watch file system. When log file is moved or removed this handler will open a new log file with specified path instantaneously. It makes sense only if log_file option is specified and Linux platform is used. This option is ignored if log_config_append is set.

Warning

This option is deprecated for removal. Its value may be silently ignored in the future.

Reason:

This function is known to have bene broken for long time, and depends on the unmaintained library

use_syslog

Type:

boolean

Default:

False

Use syslog for logging. Existing syslog format is DEPRECATED and will be changed later to honor RFC5424. This option is ignored if log_config_append is set.

use_journal

Type:

boolean

Default:

False

Enable journald for logging. If running in a systemd environment you may wish to enable journal support. Doing so will use the journal native protocol which includes structured metadata in addition to log messages.This option is ignored if log_config_append is set.

syslog_log_facility

Type:

string

Default:

LOG_USER

Syslog facility to receive log lines. This option is ignored if log_config_append is set.

use_json

Type:

boolean

Default:

False

Use JSON formatting for logging. This option is ignored if log_config_append is set.

use_stderr

Type:

boolean

Default:

False

Log output to standard error. This option is ignored if log_config_append is set.

use_eventlog

Type:

boolean

Default:

False

Log output to Windows Event Log.

Warning

This option is deprecated for removal. Its value may be silently ignored in the future.

Reason:

Windows support is no longer maintained.

log_color

Type:

boolean

Default:

False

(Optional) Set the ‘color’ key according to log levels. This option takes effect only when logging to stderr or stdout is used. This option is ignored if log_config_append is set.

log_rotate_interval

Type:

integer

Default:

1

The amount of time before the log files are rotated. This option is ignored unless log_rotation_type is set to “interval”.

log_rotate_interval_type

Type:

string

Default:

days

Valid Values:

Seconds, Minutes, Hours, Days, Weekday, Midnight

Rotation interval type. The time of the last file change (or the time when the service was started) is used when scheduling the next rotation.

max_logfile_count

Type:

integer

Default:

30

Maximum number of rotated log files.

max_logfile_size_mb

Type:

integer

Default:

200

Log file maximum size in MB. This option is ignored if “log_rotation_type” is not set to “size”.

log_rotation_type

Type:

string

Default:

none

Valid Values:

interval, size, none

Log rotation type.

Possible values

interval

Rotate logs at predefined time intervals.

size

Rotate logs once they reach a predefined size.

none

Do not rotate log files.

logging_context_format_string

Type:

string

Default:

%(asctime)s.%(msecs)03d %(process)d %(levelname)s %(name)s [%(global_request_id)s %(request_id)s %(user_identity)s] %(instance)s%(message)s

Format string to use for log messages with context. Used by oslo_log.formatters.ContextFormatter

logging_default_format_string

Type:

string

Default:

%(asctime)s.%(msecs)03d %(process)d %(levelname)s %(name)s [-] %(instance)s%(message)s

Format string to use for log messages when context is undefined. Used by oslo_log.formatters.ContextFormatter

logging_debug_format_suffix

Type:

string

Default:

%(funcName)s %(pathname)s:%(lineno)d

Additional data to append to log message when logging level for the message is DEBUG. Used by oslo_log.formatters.ContextFormatter

logging_exception_prefix

Type:

string

Default:

%(asctime)s.%(msecs)03d %(process)d ERROR %(name)s %(instance)s

Prefix each line of exception output with this format. Used by oslo_log.formatters.ContextFormatter

logging_user_identity_format

Type:

string

Default:

%(user)s %(project)s %(domain)s %(system_scope)s %(user_domain)s %(project_domain)s

Defines the format string for %(user_identity)s that is used in logging_context_format_string. Used by oslo_log.formatters.ContextFormatter

default_log_levels

Type:

list

Default:

['amqp=WARN', 'amqplib=WARN', 'boto=WARN', 'qpid=WARN', 'sqlalchemy=WARN', 'suds=INFO', 'oslo.messaging=INFO', 'oslo_messaging=INFO', 'iso8601=WARN', 'requests.packages.urllib3.connectionpool=WARN', 'urllib3.connectionpool=WARN', 'websocket=WARN', 'requests.packages.urllib3.util.retry=WARN', 'urllib3.util.retry=WARN', 'keystonemiddleware=WARN', 'routes.middleware=WARN', 'stevedore=WARN', 'taskflow=WARN', 'keystoneauth=WARN', 'oslo.cache=INFO', 'oslo_policy=INFO', 'dogpile.core.dogpile=INFO']

List of package logging levels in logger=LEVEL pairs. This option is ignored if log_config_append is set.

publish_errors

Type:

boolean

Default:

False

Enables or disables publication of error events.

instance_format

Type:

string

Default:

"[instance: %(uuid)s] "

The format for an instance that is passed with the log message.

instance_uuid_format

Type:

string

Default:

"[instance: %(uuid)s] "

The format for an instance UUID that is passed with the log message.

rate_limit_interval

Type:

integer

Default:

0

Interval, number of seconds, of log rate limiting.

rate_limit_burst

Type:

integer

Default:

0

Maximum number of logged messages per rate_limit_interval.

rate_limit_except_level

Type:

string

Default:

CRITICAL

Valid Values:

CRITICAL, ERROR, INFO, WARNING, DEBUG, ‘’

Log level name used by rate limiting. Logs with level greater or equal to rate_limit_except_level are not filtered. An empty string means that all levels are filtered.

fatal_deprecations

Type:

boolean

Default:

False

Enables or disables fatal status of deprecations.

ml2

type_drivers

Type:

list

Default:

['local', 'flat', 'vlan', 'gre', 'vxlan', 'geneve']

List of network type driver entrypoints to be loaded from the neutron.ml2.type_drivers namespace.

tenant_network_types

Type:

list

Default:

['local']

Ordered list of network_types to allocate as tenant networks. The default value ‘local’ is useful for single-box testing but provides no connectivity between hosts.

mechanism_drivers

Type:

list

Default:

[]

An ordered list of networking mechanism driver entrypoints to be loaded from the neutron.ml2.mechanism_drivers namespace.

extension_drivers

Type:

list

Default:

[]

An ordered list of extension driver entrypoints to be loaded from the neutron.ml2.extension_drivers namespace. For example: extension_drivers = port_security,qos

path_mtu

Type:

integer

Default:

0

Maximum size of an IP packet (MTU) that can traverse the underlying physical network infrastructure without fragmentation when using an overlay/tunnel protocol. This option allows specifying a physical network MTU value that differs from the default global_physnet_mtu value.

physical_network_mtus

Type:

list

Default:

[]

A list of mappings of physical networks to MTU values. The format of the mapping is <physnet>:<mtu val>. This mapping allows specifying a physical network MTU value that differs from the default global_physnet_mtu value.

external_network_type

Type:

string

Default:

<None>

Default network type for external networks when no provider attributes are specified. By default it is None, which means that if provider attributes are not specified while creating external networks then they will have the same type as tenant networks. Allowed values for external_network_type config option depend on the network type values configured in type_drivers config option.

overlay_ip_version

Type:

integer

Default:

4

Valid Values:

4, 6

IP version of all overlay (tunnel) network endpoints.

Possible values

4

IPv4

6

IPv6

tunnelled_network_rp_name

Type:

string

Default:

rp_tunnelled

Resource provider name for the host with tunnelled networks. This resource provider represents the available bandwidth for all tunnelled networks in a compute node. NOTE: this parameter is used both by the Neutron server and the mechanism driver agents; it is recommended not to change it once any resource provider register has been created.

ml2_type_flat

flat_networks

Type:

list

Default:

*

List of physical_network names with which flat networks can be created. Use default ‘*’ to allow flat networks with arbitrary physical_network names. Use an empty list to disable flat networks.

ml2_type_geneve

vni_ranges

Type:

list

Default:

[]

Comma-separated list of <vni_min>:<vni_max> tuples enumerating ranges of Geneve VNI IDs that are available for tenant network allocation. Note OVN does not use the actual values.

max_header_size

Type:

integer

Default:

30

The maximum allowed Geneve encapsulation header size (in bytes). Geneve header is extensible, this value is used to calculate the maximum MTU for Geneve-based networks. The default is 30, which is the size of the Geneve header without any additional option headers. Note the default is not enough for OVN which requires at least 38.

ml2_type_gre

tunnel_id_ranges

Type:

list

Default:

[]

Comma-separated list of <tun_min>:<tun_max> tuples enumerating ranges of GRE tunnel IDs that are available for tenant network allocation

ml2_type_vlan

network_vlan_ranges

Type:

list

Default:

[]

List of <physical_network>:<vlan_min>:<vlan_max> or <physical_network> specifying physical_network names usable for VLAN provider and tenant networks, as well as ranges of VLAN tags on each available for allocation to tenant networks. If no range is defined, the whole valid VLAN ID set [1, 4094] will be assigned.

ml2_type_vxlan

vni_ranges

Type:

list

Default:

[]

Comma-separated list of <vni_min>:<vni_max> tuples enumerating ranges of VXLAN VNI IDs that are available for tenant network allocation

vxlan_group

Type:

string

Default:

<None>

Multicast group for VXLAN. When configured, will enable sending all broadcast traffic to this multicast group. When left unconfigured, will disable multicast VXLAN mode.

ovn

ovn_nb_connection

Type:

string

Default:

tcp:127.0.0.1:6641

The connection string for the OVN_Northbound OVSDB. Use tcp:IP:PORT for TCP connection. Use ssl:IP:PORT for SSL connection. The ovn_nb_private_key, ovn_nb_certificate and ovn_nb_ca_cert are mandatory. Use unix:FILE for unix domain socket connection. Multiple connections can be specified by a comma separated string. See also: https://github.com/openvswitch/ovs/blob/ab4d3bfbef37c31331db5a9dbe7c22eb8d5e5e5f/python/ovs/db/idl.py#L215-L216

ovn_nb_private_key

Type:

string

Default:

''

The PEM file with private key for SSL connection to OVN-NB-DB

ovn_nb_certificate

Type:

string

Default:

''

The PEM file with certificate that certifies the private key specified in ovn_nb_private_key

ovn_nb_ca_cert

Type:

string

Default:

''

The PEM file with CA certificate that OVN should use to verify certificates presented to it by SSL peers

ovn_sb_connection

Type:

string

Default:

tcp:127.0.0.1:6642

The connection string for the OVN_Southbound OVSDB. Use tcp:IP:PORT for TCP connection. Use ssl:IP:PORT for SSL connection. The ovn_sb_private_key, ovn_sb_certificate and ovn_sb_ca_cert are mandatory. Use unix:FILE for unix domain socket connection. Multiple connections can be specified by a comma separated string. See also: https://github.com/openvswitch/ovs/blob/ab4d3bfbef37c31331db5a9dbe7c22eb8d5e5e5f/python/ovs/db/idl.py#L215-L216

ovn_sb_private_key

Type:

string

Default:

''

The PEM file with private key for SSL connection to OVN-SB-DB

ovn_sb_certificate

Type:

string

Default:

''

The PEM file with certificate that certifies the private key specified in ovn_sb_private_key

ovn_sb_ca_cert

Type:

string

Default:

''

The PEM file with CA certificate that OVN should use to verify certificates presented to it by SSL peers

ovsdb_connection_timeout

Type:

integer

Default:

180

Timeout, in seconds, for the OVSDB connection transaction

ovsdb_retry_max_interval

Type:

integer

Default:

180

Max interval, in seconds ,between each retry to get the OVN NB and SB IDLs

ovsdb_probe_interval

Type:

integer

Default:

60000

Minimum Value:

0

The probe interval for the OVSDB session, in milliseconds. If this is zero, it disables the connection keepalive feature. If non-zero the value will be forced to at least 1000 milliseconds. Defaults to 60 seconds.

neutron_sync_mode

Type:

string

Default:

log

Valid Values:

off, log, repair, migrate

The synchronization mode of OVN_Northbound OVSDB with Neutron DB. off - synchronization is off log - during neutron-server startup, check to see if OVN is in sync with the Neutron database. Log warnings for any inconsistencies found so that an admin can investigate repair - during neutron-server startup, automatically create resources found in Neutron but not in OVN. Also remove resources from OVN that are no longer in Neutron.migrate - This mode is to OVS to OVN migration. It will sync the DB just like repair mode but it will additionally fix the Neutron DB resource from OVS to OVN.

ovn_l3_scheduler

Type:

string

Default:

leastloaded

Valid Values:

leastloaded, chance

The OVN L3 Scheduler type used to schedule router gateway ports on hypervisors/chassis. leastloaded - chassis with fewest gateway ports selected chance - chassis randomly selected

enable_distributed_floating_ip

Type:

boolean

Default:

False

Enable distributed floating IP support. If True, the NAT action for floating IPs will be done locally and not in the centralized gateway. This saves the path to the external network. This requires the user to configure the physical network map (i.e. ovn-bridge-mappings) on each compute node.

vhost_sock_dir

Type:

string

Default:

/var/run/openvswitch

The directory in which vhost virtio sockets are created by all the vswitch daemons

dhcp_default_lease_time

Type:

integer

Default:

43200

Default lease time (in seconds) to use with OVN’s native DHCP service.

ovsdb_log_level

Type:

string

Default:

INFO

Valid Values:

CRITICAL, ERROR, WARNING, INFO, DEBUG

The log level used for OVSDB

ovn_metadata_enabled

Type:

boolean

Default:

False

Whether to use metadata service.

dns_servers

Type:

list

Default:

[]

Comma-separated list of the DNS servers which will be used as forwarders if a subnet’s dns_nameservers field is empty. If both subnet’s dns_nameservers and this option are empty, then the DNS resolvers on the host running the neutron server will be used.

ovn_dhcp4_global_options

Type:

dict

Default:

{}

Dictionary of global DHCPv4 options which will be automatically set on each subnet upon creation and on all existing subnets when Neutron starts. An empty value for a DHCP option will cause that option to be unset globally. EXAMPLES: - ntp_server:1.2.3.4,wpad:1.2.3.5 - Set ntp_server and wpad - ntp_server:,wpad:1.2.3.5 - Unset ntp_server and set wpad See the ovn-nb(5) man page for available options.

ovn_dhcp6_global_options

Type:

dict

Default:

{}

Dictionary of global DHCPv6 options which will be automatically set on each subnet upon creation and on all existing subnets when Neutron starts. An empty value for a DHCPv6 option will cause that option to be unset globally. See the ovn-nb(5) man page for available options.

ovn_emit_need_to_frag

Type:

boolean

Default:

True

Configure OVN to emit “need to frag” packets in case of MTU mismatches. You may have to disable this option if you are running an old host kernel (version < 5.2). You may check the output of the following command: ovs-appctl -t ovs-vswitchd dpif/show-dp-features br-int | grep “Check pkt length action”.

Warning

This option is deprecated for removal since 2025.1. Its value may be silently ignored in the future.

Reason:

The option is useful only on very old Linux kernels (version < 5.2).

disable_ovn_dhcp_for_baremetal_ports

Type:

boolean

Default:

False

Disable OVN’s built-in DHCP for baremetal ports (VNIC type “baremetal”). This allows operators to plug their own DHCP server of choice for PXE booting baremetal nodes. OVN 23.06.0 and newer also supports baremetal PXE based provisioning over IPv6. If an older version of OVN is used for baremetal provisioning over IPv6 this option should be set to “True” and neutron-dhcp-agent should be used instead. Defaults to “False”.

localnet_learn_fdb

Type:

boolean

Default:

False

If enabled it will allow localnet ports to learn MAC addresses and store them in FDB SB table. This avoids flooding for traffic towards unknown IPs when port security is disabled. It requires OVN 22.09 or newer.

fdb_age_threshold

Type:

integer

Default:

0

Minimum Value:

0

The number of seconds to keep FDB entries in the OVN DB. The value defaults to 0, which means disabled. This is supported by OVN >= 23.09.

mac_binding_age_threshold

Type:

integer

Default:

0

Minimum Value:

0

The number of seconds to keep MAC_Binding entries in the OVN DB. 0 to disable aging.

broadcast_arps_to_all_routers

Type:

boolean

Default:

True

If enabled (default) OVN will flood ARP requests to all attached ports on a network. If set to False, ARP requests are only sent to routers on that network if the target MAC address matches. ARP requests that do not match a router will only be forwarded to non-router ports. Supported by OVN >= 23.06.

ovn_router_indirect_snat

Type:

boolean

Default:

False

Whether to configure SNAT for all nested subnets connected to the router through any other routers, similar to the default ML2/OVS behavior. Defaults to “False”.

ovn_nb_global

ignore_lsp_down

Type:

boolean

Default:

False

If set to False, ARP/ND reply flows for logical switch ports will be installed only if the port is UP, i.e. claimed by a Chassis. If set to True, these flows are installed regardless of the status of the port, which can result in a situation that an ARP request to an IP is resolved even before the relevant VM/container is running. For environments where this is not an issue, setting it to True can reduce the load and latency of the control plane. The default value is False.

fdb_removal_limit

Type:

integer

Default:

0

Minimum Value:

0

FDB aging bulk removal limit. This limits how many rows can expire in a single transaction. Default is 0, which is unlimited. When the limit is reached, the next batch removal is delayed by 5 seconds. This is supported by OVN >= 23.09.

mac_binding_removal_limit

Type:

integer

Default:

0

Minimum Value:

0

MAC binding aging bulk removal limit. This limits how many entries can expire in a single transaction. The default is 0 which is unlimited. When the limit is reached, the next batch removal is delayed by 5 seconds.

ovs

ovsdb_timeout

Type:

integer

Default:

10

Timeout in seconds for OVSDB commands. If the timeout expires, OVSDB commands will fail with ALARMCLOCK error.

bridge_mac_table_size

Type:

integer

Default:

50000

The maximum number of MAC addresses to learn on a bridge managed by the Neutron OVS agent. Values outside a reasonable range (10 to 1,000,000) might be overridden by Open vSwitch according to the documentation.

igmp_snooping_enable

Type:

boolean

Default:

False

Enable IGMP snooping for integration bridge. If this option is set to True, support for Internet Group Management Protocol (IGMP) is enabled in integration bridge.

igmp_flood

Type:

boolean

Default:

False

Multicast packets (except reports) are unconditionally forwarded to the ports bridging a logical network to a physical network.

igmp_flood_reports

Type:

boolean

Default:

True

Multicast reports are unconditionally forwarded to the ports bridging a logical network to a physical network.

igmp_flood_unregistered

Type:

boolean

Default:

False

This option enables or disables flooding of unregistered multicast packets to all ports. If False, The switch will send unregistered multicast packets only to ports connected to multicast routers.

ovs_driver

vnic_type_prohibit_list

Type:

list

Default:

[]

Comma-separated list of VNIC types for which support is administratively prohibited by the mechanism driver. Please note that the supported vnic_types depend on your network interface card, on the kernel version of your operating system, and on other factors, like OVS version. In case of ovs mechanism driver the valid vnic types are normal and direct. Note that direct is supported only from kernel 4.8, and from ovs 2.8.0. Bind DIRECT (SR-IOV) port allows to offload the OVS flows using tc to the SR-IOV NIC. This allows to support hardware offload via tc and that allows us to manage the VF by OpenFlow control plane using representor net-device.

securitygroup

firewall_driver

Type:

string

Default:

<None>

Driver for security groups firewall in the L2 agent

enable_security_group

Type:

boolean

Default:

True

Controls whether the neutron security group API is enabled in the server. It should be false when using no security groups or using the Nova security group API.

enable_ipset

Type:

boolean

Default:

True

Use IPsets to speed-up the iptables based security groups. Enabling IPset support requires that ipset is installed on the L2 agent node.

permitted_ethertypes

Type:

list

Default:

[]

Comma-separated list of ethertypes to be permitted, in hexadecimal (starting with “0x”). For example, “0x4008” to permit InfiniBand.

sriov_driver

vnic_type_prohibit_list

Type:

list

Default:

[]

Comma-separated list of VNIC types for which support is administratively prohibited by the mechanism driver. Please note that the supported vnic_types depend on your network interface card, on the kernel version of your operating system, and on other factors. In the case of SRIOV mechanism drivers the valid VNIC types are direct, macvtap and direct-physical.