1 <database title="Open vSwitch Configuration Database">
2 <p>A database with this schema holds the configuration for one Open
3 vSwitch daemon. The root of the configuration for the daemon is
4 the <ref table="Open_vSwitch"/> table, which must have exactly one
5 record. Records in other tables are significant only when they
6 can be reached directly or indirectly from the
7 <ref table="Open_vSwitch"/> table.</p>
9 <table name="Open_vSwitch" title="Open vSwitch configuration.">
10 Configuration for an Open vSwitch daemon. There must be exactly one record
11 in the <ref table="Open_vSwitch"/> table.
13 <group title="Configuration">
14 <column name="bridges">
15 Set of bridges managed by the daemon.
18 <column name="controller">
19 Default <ref table="Controller"/> used by bridges. May be
20 overridden on a per-bridge basis by the <ref table="Bridge"
21 column="controller"/> column in <ref table="Bridge"/>.
24 <column name="managers">
25 Remote database clients to which the Open vSwitch's database server
26 should connect or to which it should listen.
30 SSL used globally by the daemon.
33 <column name="external_ids">
34 Key-value pairs that identify this Open vSwitch's role in
35 external systems. The currently defined key-value pairs are:
37 <dt><code>system-uuid</code></dt>
38 <dd>A universally unique identifier for the Open vSwitch's
39 physical host. The form of the identifier depends on the
40 type of the host. On a Citrix XenServer, this is the host
41 UUID displayed by, e.g., <code>xe host-list</code>.</dd>
46 <group title="Status">
47 <column name="next_cfg">
48 Sequence number for client to increment. When a client modifies
49 any part of the database configuration and wishes to wait for
50 Open vSwitch to finish applying the changes, it may increment
54 <column name="cur_cfg">
55 Sequence number that Open vSwitch sets to the current value of
56 <ref column="next_cfg"/> after it finishes applying a set of
57 configuration changes.
64 Configuration for a bridge within an
65 <ref table="Open_vSwitch"/>.
68 A <ref table="Bridge"/> record represents an Ethernet switch with one or
69 more ``ports,'' which are the <ref table="Port"/> records pointed to by
70 the <ref table="Bridge"/>'s <ref column="ports"/> column.
73 <group title="Core Features">
75 Bridge identifier. Should be alphanumeric and no more than about 8
76 bytes long. Must be unique among the names of ports, interfaces, and
81 Ports included in the bridge.
84 <column name="mirrors">
85 Port mirroring configuration.
88 <column name="netflow">
89 NetFlow configuration.
96 <column name="flood_vlans">
97 VLAN IDs of VLANs on which MAC address learning should be disabled, so
98 that packets are flooded instead of being sent to specific ports that
99 are believed to contain packets' destination MACs. This should
100 ordinarily be used to disable MAC learning on VLANs used for mirroring
101 (RSPAN VLANs). It may also be useful for debugging.
105 <group title="OpenFlow Configuration">
106 <column name="controller">
107 OpenFlow controller. If unset, defaults to that specified by
108 <ref column="controller" table="Open_vSwitch"/> in the
109 <ref table="Open_vSwitch"/> table. If the default is also unset, then
110 no OpenFlow controller will be used.
113 <column name="datapath_id">
114 Reports the OpenFlow datapath ID in use. Exactly 16 hex digits.
118 <group title="Other Features">
119 <column name="datapath_type">
120 Name of datapath provider. The kernel datapath has
121 type <code>system</code>. The userspace datapath has
122 type <code>netdev</code>.
125 <column name="external_ids">
126 Key-value pairs that identify this bridge's role in external systems.
127 The currently defined key-value pairs are:
129 <dt><code>xs-network-uuids</code></dt>
130 <dd>Space-delimited set of the Citrix XenServer network UUIDs with
131 which this bridge is associated.</dd>
135 <column name="other_config">
136 Key-value pairs for configuring rarely used bridge
137 features. The currently defined key-value pairs are:
139 <dt><code>datapath-id</code></dt>
141 digits to set the OpenFlow datapath ID to a specific
143 <dt><code>hwaddr</code></dt>
144 <dd>An Ethernet address in the form
145 <var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>
146 to set the hardware address of the local port and influence the
153 <table name="Port" table="Port or bond configuration.">
154 <p>A port within a <ref table="Bridge"/>.</p>
155 <p>Most commonly, a port has exactly one ``interface,'' pointed to by its
156 <ref column="interfaces"/> column. Such a port logically
157 corresponds to a port on a physical Ethernet switch. A port
158 with more than one interface is a ``bonded port'' (see
159 <ref group="Bonding Configuration"/>).</p>
160 <p>Some properties that one might think as belonging to a port are actually
161 part of the port's <ref table="Interface"/> members.</p>
164 Port name. Should be alphanumeric and no more than about 8
165 bytes long. May be the same as the interface name, for
166 non-bonded ports. Must otherwise be unique among the names of
167 ports, interfaces, and bridges on a host.
170 <column name="interfaces">
171 The port's interfaces. If there is more than one, this is a
175 <group title="VLAN Configuration">
176 <p>A bridge port must be configured for VLANs in one of two
177 mutually exclusive ways:
179 <li>A ``trunk port'' has an empty value for
180 <ref column="tag"/> and a possibly non-empty
181 <ref column="trunks"/> value.</li>
182 <li>An ``implicitly tagged VLAN port'' or ``access port''
183 has an nonempty value for <ref column="tag"/> and an empty
184 <ref column="trunks"/> value.</li>
186 If <ref column="trunks"/> and <ref column="tag"/> are both
187 nonempty, the configuration is ill-formed.
191 <p>If nonempty, this port's implicitly tagged VLAN. Frames
192 arriving on trunk ports will be forwarded to this port only
193 if they are tagged with the given VLAN. Frames arriving on
194 other VLAN ports will be forwarded to this port only if they
195 have the same <ref column="tag"/> value. Frames forwarded
196 to this port will not have an 802.1Q header.</p>
197 <p>When a frame with a 802.1Q header that indicates a nonzero VLAN is
198 received on an implicit VLAN port, it is discarded.</p>
199 <p>Must be empty if this is a trunk port.</p>
202 <column name="trunks">
203 <p>The 802.1Q VLAN(s) that this port trunks. If the column is
204 empty, then the port trunks all VLANs as well as packets that
205 have no VLAN header. Otherwise, only frames that have an
206 802.1Q header with one of the specified VLANs are accepted.
207 If <code>0</code> is included, then frames without an 802.1Q
208 header are also accepted.</p>
209 <p>Must be empty unless this is a trunk port.</p>
213 <group title="Bonding Configuration">
214 <p>A port that has more than one interface is a ``bonded port.''
215 Bonding allows for load balancing and fail-over. Open vSwitch
216 supports ``source load balancing'' (SLB) bonding, which
217 assigns flows to slaves based on source MAC address, with
218 periodic rebalancing as traffic patterns change. This form of
219 bonding does not require 802.3ad or other special support from
220 the upstream switch to which the slave devices are
223 <p>These columns apply only to bonded ports. Their values are
224 otherwise ignored.</p>
226 <column name="bond_updelay">
227 <p>For a bonded port, the number of milliseconds for which carrier must
228 stay up on an interface before the interface is considered to be up.
229 Specify <code>0</code> to enable the interface immediately.</p>
230 <p>This setting is honored only when at least one bonded interface is
231 already enabled. When no interfaces are enabled, then the first bond
232 interface to come up is enabled immediately.</p>
235 <column name="bond_downdelay">
236 For a bonded port, the number of milliseconds for which carrier must
237 stay down on an interface before the interface is considered to be
238 down. Specify <code>0</code> to disable the interface immediately.
241 <column name="bond_fake_iface">
242 For a bonded port, whether to create a fake internal interface with the
243 name of the port. Use only for compatibility with legacy software that
248 <group title="Other Features">
250 The MAC address to use for this port for the purpose of choosing the
251 bridge's MAC address. This column does not necessarily reflect the
252 port's actual MAC address, nor will setting it change the port's actual
256 <column name="fake_bridge">
257 Does this port represent a sub-bridge for its tagged VLAN within the
258 Bridge? See ovs-vsctl(8) for more information.
261 <column name="external_ids">
262 Key-value pairs that identify this port's role in external systems. No
263 key-value pairs native to <ref table="Port"/> are currently defined.
264 For fake bridges (see the <ref column="fake_bridge"/> column), external
265 IDs for the fake bridge are defined here by prefixing a
266 <ref table="Bridge"/> <ref table="Bridge" column="external_ids"/> key
267 with <code>fake-bridge-</code>,
268 e.g. <code>fake-bridge-xs-network-uuids</code>.
271 <column name="other_config">
272 Key-value pairs for configuring rarely used port features. The
273 currently defined key-value pairs are:
275 <dt><code>hwaddr</code></dt>
276 <dd>An Ethernet address in the form
277 <code><var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var></code>.</dd>
283 <table name="Interface" title="One physical network device in a Port.">
284 An interface within a <ref table="Port"/>.
286 <group title="Core Features">
288 Interface name. Should be alphanumeric and no more than about 8 bytes
289 long. May be the same as the port name, for non-bonded ports. Must
290 otherwise be unique among the names of ports, interfaces, and bridges
295 <p>Ethernet address to set for this interface. If unset then the
296 default MAC address is used:</p>
298 <li>For the local interface, the default is the lowest-numbered MAC
299 address among the other bridge ports, either the value of the
300 <ref table="Port" column="mac"/> in its <ref table="Port"/> record,
301 if set, or its actual MAC (for bonded ports, the MAC of its slave
302 whose name is first in alphabetical order). Internal ports and
303 bridge ports that are used as port mirroring destinations (see the
304 <ref table="Mirror"/> table) are ignored.</li>
305 <li>For other internal interfaces, the default MAC is randomly
307 <li>External interfaces typically have a MAC address associated with
310 <p>Some interfaces may not have a software-controllable MAC
314 <column name="ofport">
315 <p>OpenFlow port number for this interface. Unlike most columns, this
316 column's value should be set only by Open vSwitch itself. Other
317 clients should set this column to an empty set (the default) when
318 creating an <ref table="Interface"/>.</p>
319 <p>Open vSwitch populates this column when the port number becomes
320 known. If the interface is successfully added,
321 <ref column="ofport"/> will be set to a number between 1 and 65535
322 (generally either in the range 1 to 65280, exclusive, or 65534, the
323 port number for the OpenFlow ``local port''). If the interface
324 cannot be added then Open vSwitch sets this column
329 <group title="System-Specific Details">
331 The interface type, one of:
333 <dt><code>system</code></dt>
334 <dd>An ordinary network device, e.g. <code>eth0</code> on Linux.
335 Sometimes referred to as ``external interfaces'' since they are
336 generally connected to hardware external to that on which the Open
337 vSwitch is running. The empty string is a synonym for
338 <code>system</code>.</dd>
339 <dt><code>internal</code></dt>
340 <dd>A simulated network device that sends and receives traffic. An
341 internal interface whose <ref column="name"/> is the same as its
342 bridge's <ref table="Open_vSwitch" column="name"/> is called the
343 ``local interface.'' It does not make sense to bond an internal
344 interface, so the terms ``port'' and ``interface'' are often used
345 imprecisely for internal interfaces.</dd>
346 <dt><code>tap</code></dt>
347 <dd>A TUN/TAP device managed by Open vSwitch.</dd>
348 <dt><code>gre</code></dt>
349 <dd>A GRE tunnel device managed by Open vSwitch.</dd>
353 <column name="options">
354 Configuration options whose interpretation varies based on
355 <ref column="type"/>.
359 <group title="Ingress Policing">
360 <column name="ingress_policing_burst">
361 <p>Maximum burst size for data received on this interface, in kb. The
362 default burst size if set to <code>0</code> is 1000 kb. This value
363 has no effect if <ref column="ingress_policing_rate"/>
364 is <code>0</code>.</p>
365 <p>The burst size should be at least the size of the interface's
369 <column name="ingress_policing_rate">
370 <p>Maximum rate for data received on this interface, in kbps. Data
371 received faster than this rate is dropped. Set to <code>0</code> to
372 disable policing.</p>
373 <p>The meaning of ``ingress'' is from Open vSwitch's perspective. If
374 configured on a physical interface, then it limits the rate at which
375 traffic is allowed into the system from the outside. If configured
376 on a virtual interface that is connected to a virtual machine, then
377 it limits the rate at which the guest is able to transmit.</p>
381 <group title="Other Features">
382 <column name="external_ids">
383 <p>Key-value pairs that identify this interface's role in external
384 systems. All of the currently defined key-value pairs specifically
385 apply to an interface that represents a virtual Ethernet interface
386 connected to a virtual machine. These key-value pairs should not be
387 present for other types of interfaces. Keys whose names end
388 in <code>-uuid</code> have values that uniquely identify the entity
389 in question. For a Citrix XenServer hypervisor, these values are
390 UUIDs in RFC 4122 format. Other hypervisors may use other
392 <p>The currently defined key-value pairs are:</p>
394 <dt><code>vif-uuid</code></dt>
395 <dd>The virtual interface associated with this interface.</dd>
396 <dt><code>network-uuid</code></dt>
397 <dd>The virtual network to which this interface is attached.</dd>
398 <dt><code>vm-uuid</code></dt>
399 <dd>The VM to which this interface belongs.</dd>
400 <dt><code>vif-mac</code></dt>
401 <dd>The MAC address programmed into the "virtual hardware" for this
403 form <var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>.
404 For Citrix XenServer, this is the value of the <code>MAC</code>
405 field in the VIF record for this interface.</dd>
411 <table name="Mirror" title="Port mirroring (SPAN/RSPAN).">
412 <p>A port mirror within a <ref table="Bridge"/>.</p>
413 <p>A port mirror configures a bridge to send selected frames to special
414 ``mirrored'' ports, in addition to their normal destinations. Mirroring
415 traffic may also be referred to as SPAN or RSPAN, depending on the
416 mechanism used for delivery.</p>
419 Arbitrary identifier for the <ref table="Mirror"/>.
422 <group title="Selecting Packets for Mirroring">
423 <column name="select_dst_port">
424 Ports on which departing packets are selected for mirroring.
427 <column name="select_src_port">
428 Ports on which arriving packets are selected for mirroring. If this
429 column and <ref column="select_dst_port"/> are both empty, then all
430 packets on all ports are selected for mirroring.
433 <column name="select_vlan">
434 VLANs on which packets are selected for mirroring. An empty set
435 selects packets on all VLANs.
439 <group title="Mirroring Destination Configuration">
440 <column name="output_port">
441 <p>Output port for selected packets, if nonempty. Mutually exclusive
442 with <ref column="output_vlan"/>.</p>
443 <p>Specifying a port for mirror output reserves that port exclusively
444 for mirroring. No frames other than those selected for mirroring
445 will be forwarded to the port, and any frames received on the port
446 will be discarded.</p>
447 <p>This type of mirroring is sometimes called SPAN.</p>
450 <column name="output_vlan">
451 <p>Output VLAN for selected packets, if nonempty. Mutually exclusive
452 with <ref column="output_port"/>.</p>
453 <p>The frames will be sent out all ports that trunk
454 <ref column="output_vlan"/>, as well as any ports with implicit VLAN
455 <ref column="output_vlan"/>. When a mirrored frame is sent out a
456 trunk port, the frame's VLAN tag will be set to
457 <ref column="output_vlan"/>, replacing any existing tag; when it is
458 sent out an implicit VLAN port, the frame will not be tagged. This
459 type of mirroring is sometimes called RSPAN.</p>
460 <p><em>Please note:</em> Mirroring to a VLAN can disrupt a network that
461 contains unmanaged switches. Consider an unmanaged physical switch
462 with two ports: port 1, connected to an end host, and port 2,
463 connected to an Open vSwitch configured to mirror received packets
464 into VLAN 123 on port 2. Suppose that the end host sends a packet on
465 port 1 that the physical switch forwards to port 2. The Open vSwitch
466 forwards this packet to its destination and then reflects it back on
467 port 2 in VLAN 123. This reflected packet causes the unmanaged
468 physical switch to replace the MAC learning table entry, which
469 correctly pointed to port 1, with one that incorrectly points to port
470 2. Afterward, the physical switch will direct packets destined for
471 the end host to the Open vSwitch on port 2, instead of to the end
472 host on port 1, disrupting connectivity. If mirroring to a VLAN is
473 desired in this scenario, then the physical switch must be replaced
474 by one that learns Ethernet addresses on a per-VLAN basis. In
475 addition, learning should be disabled on the VLAN containing mirrored
476 traffic. If this is not done then intermediate switches will learn
477 the MAC address of each end host from the mirrored traffic. If
478 packets being sent to that end host are also mirrored, then they will
479 be dropped since the switch will attempt to send them out the input
480 port. Disabling learning for the VLAN will cause the switch to
481 correctly send the packet out all ports configured for that VLAN. If
482 Open vSwitch is being used as an intermediate switch, learning can be
483 disabled by adding the mirrored VLAN to <ref column="flood_vlans"/>
484 in the appropriate <ref table="Bridge"/> table or tables.</p>
489 <table name="Controller" title="OpenFlow controller configuration.">
490 An OpenFlow controller.
492 <group title="Core Features">
493 <column name="target">
494 Connection method for controller.
495 The following connection methods are currently
498 <dt><code>ssl:<var>ip</var></code>[<code>:<var>port</var></code>]</dt>
500 <p>The specified SSL <var>port</var> (default: 6633) on the host at
501 the given <var>ip</var>, which must be expressed as an IP address
502 (not a DNS name). The <ref table="Open_vSwitch" column="ssl"/>
503 column in the <ref table="Open_vSwitch"/> must point to a valid
504 SSL configuration when this form is used.</p>
505 <p>SSL support is an optional feature that is not always built as
506 part of Open vSwitch.</p>
508 <dt><code>tcp:<var>ip</var></code>[<code>:<var>port</var></code>]</dt>
509 <dd>The specified TCP <var>port</var> (default: 6633) on the host at
510 the given <var>ip</var>, which must be expressed as an IP address
511 (not a DNS name).</dd>
512 <dt><code>discover</code></dt>
513 <dd>Enables controller discovery.</dd>
514 <dt><code>none</code></dt>
515 <dd>Disables the controller.</dd>
519 <column name="connection_mode">
520 Either <code>in-band</code> or <code>out-of-band</code>. If not
521 specified, the default is implementation-specific.
525 <group title="Controller Failure Detection and Handling">
526 <column name="max_backoff">
527 Maximum number of milliseconds to wait between connection attempts.
528 Default is implementation-specific.
531 <column name="inactivity_probe">
532 Maximum number of milliseconds of idle time on connection to
533 controller before sending an inactivity probe message. If Open
534 vSwitch does not communicate with the controller for the specified
535 number of seconds, it will send a probe. If a response is not
536 received for the same additional amount of time, Open vSwitch
537 assumes the connection has been broken and attempts to reconnect.
538 Default is implementation-specific.
541 <column name="fail_mode">
542 <p>When a controller is configured, it is, ordinarily, responsible
543 for setting up all flows on the switch. Thus, if the connection to
544 the controller fails, no new network connections can be set up.
545 If the connection to the controller stays down long enough,
546 no packets can pass through the switch at all. This setting
547 determines the switch's response to such a situation. It may be set
548 to one of the following:
550 <dt><code>standalone</code></dt>
551 <dd>If no message is received from the controller for three
552 times the inactivity probe interval
553 (see <ref column="inactivity_probe"/>), then Open vSwitch
554 will take over responsibility for setting up flows. In
555 this mode, Open vSwitch causes the datapath to act like an
556 ordinary MAC-learning switch. Open vSwitch will continue
557 to retry connecting to the controller in the background
558 and, when the connection succeeds, it will discontinue its
559 standalone behavior.</dd>
560 <dt><code>secure</code></dt>
561 <dd>Open vSwitch will not set up flows on its own when the
562 controller connection fails. It will continue retry
563 connecting to the controller forever.</dd>
566 <p>If this value is unset, the default is
567 implementation-specific.</p>
571 <group title="OpenFlow Rate Limiting">
572 <column name="controller_burst_limit">
573 In conjunction with <ref column="controller_rate_limit"/>,
574 the maximum number of unused packet credits that the bridge will
575 allow to accumulate, in packets. If not specified, the default
576 is implementation-specific.
579 <column name="controller_rate_limit">
580 <p>The maximum rate at which packets in unknown flows will be
581 forwarded to the OpenFlow controller, in packets per second. This
582 feature prevents a single bridge from overwhelming the controller.
583 If not specified, the default is implementation-specific.</p>
584 <p>In addition, when a high rate triggers rate-limiting, Open
585 vSwitch queues controller packets for each port and transmits
586 them to the controller at the configured rate. The number of
587 queued packets is limited by
588 the <ref column="controller_burst_limit"/> value. The packet
589 queue is shared fairly among the ports on a bridge.</p><p>Open
590 vSwitch maintains two such packet rate-limiters per bridge.
591 One of these applies to packets sent up to the controller
592 because they do not correspond to any flow. The other applies
593 to packets sent up to the controller by request through flow
594 actions. When both rate-limiters are filled with packets, the
595 actual rate that packets are sent to the controller is up to
596 twice the specified rate.</p>
600 <group title="Additional Configuration for Discovery">
601 <column name="discover_accept_regex">
602 If <ref column="target"/> is <code>discover</code>, a POSIX
603 extended regular expression against which the discovered controller
604 location is validated. The regular expression is implicitly
605 anchored at the beginning of the controller location string, as
606 if it begins with <code>^</code>. If not specified, the default
607 is implementation-specific.
610 <column name="discover_update_resolv_conf">
611 If <ref column="target"/> is <code>discover</code>,
612 whether to update <code>/etc/resolv.conf</code> when the
613 controller is discovered. If not specified, the default
614 is implementation-specific. Open vSwitch will only modify
615 <code>/etc/resolv.conf</code> if the DHCP response that it receives
616 specifies one or more DNS servers.
620 <group title="Additional Configuration without Discovery">
621 <column name="local_gateway">
622 If <ref column="target"/> is not <code>discover</code>, the IP
623 address of the gateway to configure on the local port.
626 <column name="local_ip">
627 If <ref column="target"/> is not <code>discover</code>, the IP
628 address to configure on the local port.
631 <column name="local_netmask">
632 If <ref column="target"/> is not <code>discover</code>, the IP
633 netmask to configure on the local port.
638 <table name="NetFlow">
639 A NetFlow target. NetFlow is a protocol that exports a number of
640 details about terminating IP flows, such as the principals involved
643 <column name="targets">
644 NetFlow targets in the form
645 <code><var>ip</var>:<var>port</var></code>. The <var>ip</var>
646 must be specified numerically, not as a DNS name.
649 <column name="engine_id">
650 Engine ID to use in NetFlow messages. Defaults to datapath index
654 <column name="engine_type">
655 Engine type to use in NetFlow messages. Defaults to datapath
656 index if not specified.
659 <column name="active_timeout">
660 The interval at which NetFlow records are sent for flows that are
661 still active, in seconds. A value of <code>0</code> requests the
662 default timeout (currently 600 seconds); a value of <code>-1</code>
663 disables active timeouts.
666 <column name="add_id_to_interface">
667 <p>If this column's value is <code>false</code>, the ingress and egress
668 interface fields of NetFlow flow records are derived from OpenFlow port
669 numbers. When it is <code>true</code>, the 7 most significant bits of
670 these fields will be replaced by the least significant 7 bits of the
671 engine id. This is useful because many NetFlow collectors do not
672 expect multiple switches to be sending messages from the same host, so
673 they do not store the engine information which could be used to
674 disambiguate the traffic.</p>
675 <p>When this option is enabled, a maximum of 508 ports are supported.</p>
680 SSL configuration for an Open_vSwitch.
682 <column name="private_key">
683 Name of a PEM file containing the private key used as the switch's
684 identity for SSL connections to the controller.
687 <column name="certificate">
688 Name of a PEM file containing a certificate, signed by the
689 certificate authority (CA) used by the controller and manager,
690 that certifies the switch's private key, identifying a trustworthy
694 <column name="ca_cert">
695 Name of a PEM file containing the CA certificate used to verify
696 that the switch is connected to a trustworthy controller.
699 <column name="bootstrap_ca_cert">
700 If set to <code>true</code>, then Open vSwitch will attempt to
701 obtain the CA certificate from the controller on its first SSL
702 connection and save it to the named PEM file. If it is successful,
703 it will immediately drop the connection and reconnect, and from then
704 on all SSL connections must be authenticated by a certificate signed
705 by the CA certificate thus obtained. <em>This option exposes the
706 SSL connection to a man-in-the-middle attack obtaining the initial
707 CA certificate.</em> It may still be useful for bootstrapping.
712 <p>An sFlow(R) target. sFlow is a protocol for remote monitoring
715 <column name="agent">
716 IP address to report as ``agent address'' to collectors. If not
717 specified, defaults to the <ref table="Controller" column="local_ip"/> in
718 the collector's <ref table="Controller"/>. If neither is specified,
722 <column name="header">
723 Number of bytes of a sampled packet to send to the collector.
724 If not specified, the default is 128 bytes.
727 <column name="polling">
728 Polling rate in seconds to send port statistics to the collector.
729 If not specified, defaults to 30 seconds.
732 <column name="sampling">
733 Rate at which packets should be sampled and sent to the collector.
734 If not specified, defaults to 400, which means one out of 400
735 packets, on average, will be sent to the collector.
738 <column name="targets">
739 sFlow targets in the form
740 <code><var>ip</var>:<var>port</var></code>.