bridge

show / manipulate bridge addresses and devices

SYNOPSIS

-8 bridge [OPTIONS]OBJECT{COMMAND| help}



-8 OBJECT:= { link|fdb|mdb|vlan|monitor}

-8 OPTIONS:= { -V [ ersion ]| -s [ tatistics ]| -n [ etns ]name | -b [ atch ]filename | -c [ lor ]| -p [ retty ]| -j [ son ]| -o [ neline ]}
-8 bridgelinkset dev DEV [ cost COST] [ priority PRIO] [ state STATE] [ guard{on|off} ] [ hairpin{on|off} ] [ fastleave{on|off} ] [ root_block{on|off} ] [ learning{on|off} ] [ learning_sync{on|off} ] [ flood{on|off} ] [ hwmode{vepa|veb} ] [ mcast_flood{on|off} ] [ mcast_to_unicast{on|off} ] [ neigh_suppress{on|off} ] [ vlan_tunnel{on|off} ] [ isolated{on|off} ] [ backup_port DEVICE] [ nobackup_port] [ self] [master]
-8 bridge link[show] [ dev DEV]
-8 bridge fdb{add|append|del|replace} LLADDR dev DEV{ local|static|dynamic} [ self] [master] [router] [use] [extern_learn] [sticky] [ dst IPADDR] [ src_vni SRC_VNI] [ vni VNI] [ port PORT] [ via DEVICE]
-8 bridge fdb[show] [ dev DEV] [ br BRDEV] [ brport DEV] [ vlan VID] [ state STATE]
-8 bridge mdb{add|del} dev DEV port PORT grp GROUP[ permanent|temp] [ vid VID]
-8 bridge mdb show[" dev DEV]
-8 bridge vlan{add|del} dev DEV vid VID[ tunnel_info TUNNEL_ID] [ pvid] [untagged] [ self] [master]
-8 bridge vlan[show|tunnelshow] [ dev DEV]
-8 bridge monitor[all|neigh|link|mdb]

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.


devDEV the interface to which this address is associated.
local - is a local permanent fdb entry

static - is a static (no arp) fdb entry

dynamic - is a dynamic reachable age-able fdb entry

self - the address is associated with the port drivers fdb. Usually hardware.

master - the address is associated with master devices fdb. Usually software (default).

router - the destination address is associated with a router. Valid if the referenced device is a VXLAN type device and has route shortcircuit enabled.

use - the address is in use. User space can use this option to indicate to the kernel that the fdb entry is in use.

extern_learn - this entry was learned externally. This option can be used to indicate to the kernel that an entry was hardware or user-space controller learnt dynamic entry. Kernel will not age such an entry.

sticky - this entry will not change its port due to learning.

The next command line parameters apply only when the specified device DEV is of type VXLAN.

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


src_vniSRC VNI the src VNI Network Identifier (or VXLAN Segment ID) this entry belongs to. Used only when the vxlan device is in external or collect metadata mode. If omitted the value specified at vxlan device creation will be used.


vniVNI 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.


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


viaDEVICE 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

If no matching entry is found, a new one will be created instead.


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.

bridge mdb add - add a new multicast group database entry


This command creates a new mdb entry.


devDEV the interface where this group address is associated.


portPORT the port whose link is known to have members of this multicast group.


grpGROUP 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)



vidVID the VLAN ID which is known to have members of this multicast group.

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 automatically. It can be altered by bridge mdb add and bridge mdb del commands manually too.


devDEV 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.


With the -statistics option, the command displays timer values for mdb and router port entries.

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.


devNAME the interface with which this vlan is associated.


vidVID the VLAN ID that identifies the vlan.


tunnel_infoTUNNEL_ID the TUNNEL ID that maps to this vlan. The tunnel id is set in dst_metadata for every packet that belongs to this vlan (applicable to bridge ports with vlan_tunnel flag set).


pvid the vlan specified is to be considered a PVID at ingress. Any untagged frames will be assigned to this VLAN.


untagged the vlan specified is to be treated as untagged on egress.


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 vlan filter entry

This command removes an existing vlan filter entry.


The arguments are the same as with bridge vlan add. The pvidanduntagged flags are ignored.

bridge vlan show - list vlan configuration.


This command displays the current VLAN filter table.


With the -statistics option, the command displays per-vlan traffic statistics.

bridge vlan tunnelshow - list vlan tunnel mapping.


This command displays the current vlan tunnel info mapping.

bridge monitor - state monitoring

The bridge utility can monitor the state of devices and addresses continuously. 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, andmdb. 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.

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.

BRIDGE - COMMAND SYNTAX

OBJECT


link - Bridge port.


fdb - Forwarding Database entry.


mdb - Multicast group database entry.


vlan - VLAN filter list.

COMMAND
Specifies the action to perform on the object. The set of possible actions depends on the object type. As a rule, it is possible to add,delete and show (or list ) objects, but some objects do not allow all of these operations or have some additional commands. The help command is available for all objects. It prints out a list of available commands 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 specific attributes.

bridge link set - set bridge specific attributes on a port




devNAME interface name of the bridge port


costCOST the STP path cost of the specified port.


priorityPRIO 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.


stateSTATE the operation state of the port. This is primarily used by user space STP/RSTP implementation. One may enter a lowercased port state name, or one of the numbers below. Negative inputs are ignored, and unrecognized names return an error.
0 - port is DISABLED. Make this port completely inactive.

1 - STP LISTENING state. Only valid if STP is enabled on the bridge. In this state the port listens for STP BPDUs and drops all other traffic frames.

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 address 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 this state, port will only process STP BPDUs.



guard onorguard off Controls whether STP BPDUs will be processed by the bridge port. By default, the flag is turned off allowed BPDU processing. Turning this flag on will cause the port to stop processing STP BPDUs.


hairpin onorhairpin off 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 onorfastleave off This flag allows the bridge to immediately stop multicast traffic 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 onorroot_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.


learning onorlearning off Controls whether a given port will learn MAC addresses from received traffic or not. If learning if off, the bridge will end up flooding any traffic for which it has no FDB entry. By default this flag is on.


learning_sync onorlearning_sync off Controls whether a given port will sync MAC addresses learned on device port to bridge FDB.


flood onorflood off Controls whether a given port will flood unicast traffic for which there is no FDB entry. By default this flag is on.


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.


mcast_flood onormcast_flood off Controls whether a given port will flood multicast traffic for which there is no MDB entry. By default this flag is on.


mcast_to_unicast onormcast_to_unicast off Controls whether a given port will replicate packets using unicast instead of multicast. By default this flag is off.


neigh_suppress onorneigh_suppress off Controls whether neigh discovery (arp and nd) proxy and suppression is enabled on the port. By default this flag is off.


vlan_tunnel onorvlan_tunnel off Controls whether vlan to tunnel mapping is enabled on the port. By default this flag is off.


isolated onorisolated off Controls whether a given port will be isolated, which means it will be able to communicate with non-isolated ports only. By default this flag is off.


backup_portDEVICE If the port loses carrier all traffic will be redirected to the configured backup port


nobackup_port Removes the currently configured backup port


self link setting is configured on specified physical device


master link setting is configured on the software bridge (default)


-t,-timestamp display current time when using monitor option.

bridge link show - list bridge port configuration.


This command displays the current bridge port configuration and flags.

BUGS

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

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.


-d,-details print detailed information about MDB router ports.


-n,-net,-netns<NETNS> switches bridge to the specified network namespace NETNS. Actually it just simplifies executing of:
ip netns exec NETNS bridge [OPTIONS]OBJECT{COMMAND| help}
to
bridge -n[etns]NETNS[OPTIONS]OBJECT{COMMAND| help}


-b,-batch<FILENAME> Read commands from provided file or standard input and invoke them. First failure will cause termination of bridge command.


-force Don't terminate bridge command on errors in batch mode. If there were any errors during execution of the commands, the application return code will be non zero.


-c[color][={always|auto|never} Configure color output. If parameter is omitted or always, color output is enabled regardless of stdout state. If parameter is auto, stdout is checked to be a terminal before enabling color output. If parameter is never, color output is disabled. If specified multiple times, the last one takes precedence. This flag is ignored if -json is also given.


-j,-json Output results in JavaScript Object Notation (JSON).


-p,-pretty When combined with -j generate a pretty JSON output.


-o,-oneline output each record on a single line, replacing line feeds with the ' \ ' character. This is convenient when you want to count records with wc(1) or to grep(1) the output.

SEE ALSO

ip(8)

AUTHOR

Original Manpage by Stephen Hemminger

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