bridge


SYNOPSIS
       bridge [ OPTIONS ] OBJECT { COMMAND | help }


       OBJECT := { link | fdb | mdb | vlan | monitor }


       OPTIONS := { -V[ersion] | -s[tatistics] }

       bridge link set dev DEV  [ cost COST ] [ priority PRIO ]  [ state
               STATE] [ guard { on | off } ] [ hairpin { on | off } ] [
               fastleave { on | off } ] [ root_block { on | off } ] [ hwmode {
               vepa | veb } ]

       bridge link [ show ] [ dev DEV ]

       bridge fdb { add | append | del } LLADDR dev DEV { local | temp } {
               self } { embedded } { router } [ dst IPADDR ] [ vni VNI ] [
               port PORT ] [ via DEVICE ]

       bridge fdb [ show ] [ dev DEV ]

       bridge mdb { add | del } dev DEV port PORT grp GROUP [ permanent | temp
               ]

       bridge mdb show [ dev DEV ]

       bridge vlan { add | del } dev DEV vid VID [ pvid ] [ untagged ]  [ self
               ]  [ master ]

       bridge vlan [ show ] [ dev DEV ]

       bridge monitor [ all | neigh | link | mdb ]


OPTIONS
       -V, -Version
              print the version of the bridge utility and exit.


       -s, -stats, -statistics
              output more information.  If this option is given multiple
              times, the amount of information increases.  As a rule, the
              information is statistics or some time values.



BRIDGE - COMMAND SYNTAX
   OBJECT
       link   - Bridge port.


       fdb    - Forwarding Database entry.
       of these operations or have some additional commands.  The help command
       is available for all objects.  It prints out a list of available com-
       mands and argument syntax conventions.

       If no command is given, some default command is assumed.  Usually it is
       list or, if the objects of this class cannot be listed, help.


bridge link - bridge port
       link objects correspond to the port devices of the bridge.


       The corresponding commands set and display port status and bridge spe-
       cific attributes.


   bridge link set - set bridge specific attributes on a port
       dev NAME
              interface name of the bridge port


       cost COST
              the STP path cost of the specified port.


       priority PRIO
              the STP port priority.  The priority value is an unsigned 8-bit
              quantity (number between 0 and 255).  This metric is used in the
              designated port an droot port selectio algorithms.


       state STATE
              the operation state of the port.  This is primarily used by user
              space STP/RSTP implementation.  The following is a list of valid
              values:

              0 - port is DISABLED.  Make this port completely inactive.


              1 - STP LISTENING state.  Only valid if STP is enabled on the
              brige.  In this state the port for list for STP BPDUs and drop
              all other traffic.


              2 - STP LEARNING state.  Only valid if STP is enabled on the
              bridge.  In this state the port will accept traffic only for the
              purpose of updating MAC adress tables.


              3 - STP FORWARDING state.  Port is fully active.


              4 - STP BLOCKING state.  Only valid if STP is enabled on the
              bridge.  This state is used during the STP election process.  In
              Controls whether traffic may be send back out of the port on
              which it was received.  By default, this flag is turned off and
              the bridge will not forward traffic back out of the receiving
              port.


       fastleave on or fastleave off
              This flag allows the bridge to immediately stop multicast traf-
              fic on a port that receives IGMP Leave message.  It is only used
              with IGMP snooping is enabled on the bridge.  By default the
              flag is off.


       root_block on or root_block off
              Controls whether a given port is allowed to become root port or
              not.  Only used when STP is enabled on the bridge.  By default
              the flag is off.


       hwmode Some network interface cards support HW bridge functionality and
              they may be configured in different modes.  Currently support
              modes are:

              vepa - Data sent between HW ports is sent on the wire to the
              external switch.

              veb - bridging happens in hardware.


   bridge link show - list bridge port configuration.
       This command displays the current bridge port configuration and flags.


bridge fdb - forwarding database management
       fdb objects contain known Ethernet addresses on a  link.


       The corresponding commands display fdb entries, add new entries, append
       entries, and delete old ones.


   bridge fdb add - add a new fdb entry
       This command creates a new fdb entry.


       LLADDR the Ethernet MAC address.


       dev DEV
              the interface to which this address is associated.

              self - the address is associated with a software fdb (default)


              the IP address of the destination VXLAN tunnel endpoint where
              the Ethernet MAC ADDRESS resides.


       vni VNI
              the VXLAN VNI Network Identifier (or VXLAN Segment ID) to use to
              connect to the remote VXLAN tunnel endpoint.  If omitted the
              value specified at vxlan device creation will be used.


       port PORT
              the UDP destination PORT number to use to connect to the remote
              VXLAN tunnel endpoint.  If omitted the default value is used.


       via DEVICE
              device name of the outgoing interface for the VXLAN device
              driver to reach the remote VXLAN tunnel endpoint.


   bridge fdb append - append a forwarding database entry
       This command adds a new fdb entry with an already known LLADDR.  Valid
       only for multicast link layer addresses.  The command adds support for
       broadcast and multicast Ethernet MAC addresses.  The Ethernet MAC
       address is added multiple times into the forwarding database and the
       vxlan device driver sends a copy of the data packet to each entry
       found.


       The arguments are the same as with bridge fdb add,


   bridge fdb delete - delete a forwarding database entry
       This command removes an existing fdb entry.


       The arguments are the same as with bridge fdb add,


   bridge fdb show - list forwarding entries.
       This command displays the current forwarding table.


       With the -statistics option, the command becomes verbose.  It prints
       out the last updated and last used time for each entry.


bridge mdb - multicast group database management
       mdb objects contain known IP multicast group addresses on a link.


       The corresponding commands display mdb entries, add new entries, and
       delete old ones.



       grp GROUP
              the IP multicast group address whose members reside on the link
              connected to the port.

              permanent - the mdb entry is permanent


              temp - the mdb entry is temporary (default)



   bridge mdb delete - delete a multicast group database entry
       This command removes an existing mdb entry.


       The arguments are the same as with bridge mdb add.


   bridge mdb show - list multicast group database entries
       This command displays the current multicast group membership table. The
       table is populated by IGMP and MLD snooping in the bridge driver auto-
       matically. It can be altered by bridge mdb add and bridge mdb del com-
       mands manually too.


       dev DEV
              the interface only whose entries should be listed. Default is to
              list all bridge interfaces.


       With the -details option, the command becomes verbose.  It prints out
       the ports known to have a connected router.


bridge vlan - VLAN filter list
       vlan objects contain known VLAN IDs for a link.


       The corresponding commands display vlan filter entries, add new
       entries, and delete old ones.


   bridge vlan add - add a new vlan filter entry
       This command creates a new vlan filter entry.


       dev NAME
              the interface with which this vlan is associated.


       vid VID
              the VLAN ID that identifies the vlan.


       master the vlan is configured on the software bridge (default).


   bridge vlan delete - delete a forwarding database entry
       This command removes an existing fdb entry.


       The arguments are the same as with bridge vlan add.  The pvid and
       untagged flags are ignored.


   bridge vlan show - list vlan configuration.
       This command displays the current VLAN filter table.


bridge monitor - state monitoring
       The bridge utility can monitor the state of devices and  addresses con-
       tinuously.  This option has a slightly different format.  Namely, the
       monitor command is the first in the command line and then the object
       list follows:

       bridge monitor [ all | OBJECT-LIST ]

       OBJECT-LIST is the list of object types that we want to monitor.  It
       may contain link,  fdb, and mdb.  If no file argument is given, bridge
       opens RTNETLINK, listens on it and dumps state changes in the format
       described in previous sections.


       If a file name is given, it does not listen on RTNETLINK, but opens the
       file containing RTNETLINK messages saved in binary format and dumps
       them.  Such a history file can be generated with the



NOTES
       This command uses facilities added in Linux 3.0.

       Although the forwarding table is maintained on a per-bridge device
       basis the bridge device is not part of the syntax. This is a limitation
       of the underlying netlink neighbour message protocol. When displaying
       the forwarding table, entries for all bridges are displayed.
       Add/delete/modify commands determine the underlying bridge device based
       on the bridge to which the corresponding ethernet device is attached.



SEE ALSO
       ip(8)

BUGS
       Please direct bugreports and patches to: <netdev@vger.kernel.org>
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