bridge link (iproute2)

#http://www.pearltrees.com/s243a/bridge-link/id14846130
Usage: 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 link - bridge port         top

       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
       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. 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
              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
              this state, port will only process STP BPDUs.

       guard on or guard off
              Controls whether STP BPUDs 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 on or hairpin 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 on or fastleave 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 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.

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

       flooding on or flooding 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.

       self   link setting is configured on specified physical device

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

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