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    Command:

    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 | replace } LLADDR dev DEV { local |
                   temp } { self } { 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.
    
           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
                  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)
    
           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 replace - replace a forwarding database entry
           This command replaces an already present 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.
           port PORT
                  the port whose link is known to have members of this multicast
                  group.
    
           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
    
           self   the vlan is configured on the specified physical device.
                  Required if the device is the bridge device.
    
           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.
    
           The Red Hat Enterprise Linux 6 kernel does not support changing bridge
           ports (bridge link set), and listing or changing VLAN filter lists
    
    
    

    iproute2 1 August 2012 BRIDGE(8)

    
    
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