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Bridging
--------
Interfaces in VyOS can be bridged together to provide software switching of
Layer-2 traffic.
A bridge is created when a bridge interface is defined. In the example below
we create a bridge named br100 with eth1 and eth2 as the bridge member ports.
.. code-block:: sh
set interfaces bridge 'br100'
set interfaces bridge br100 member interface eth1
set interfaces bridge br100 member interface eth2
Each bridge member can be assiged a port cost and priority using the following
commands:
.. code-block:: sh
set interfaces bridge br100 member interface eth1 cost 10
set interfaces bridge br100 member interface eth1 priority 1024
Interfaces assigned to a bridge do not have address configuration. An IP
address can be assigned to the bridge interface itself, however, like any
normal interface.
.. code-block:: sh
set interfaces bridge br100 address '192.168.100.1/24'
set interfaces bridge br100 address '2001:db8:100::1/64'
Example Result:
.. code-block:: sh
bridge br100 {
address 192.168.100.1/24
address 2001:db8:100::1/64
member {
interface eth1 {
cost 10
priority 1024
}
interface eth2 {
}
}
}
[...]
In addition to normal IP interface configuration, bridge interfaces support
Spanning-Tree Protocol. STP is disabled by default.
.. note:: Please use caution when introducing spanning-tree protocol on a
network as it may result in topology changes.
To enable spanning-tree use the `set interfaces bridge <name> stp` command:
.. code-block:: sh
set interfaces bridge br100 stp
STP `priority`, `forwarding-delay`, `hello-time`, and `max-age` can be
configured for the bridge. The MAC aging time can also be configured
using the `aging` directive.
The `show bridge` operational command can be used to display configured
bridges:
.. code-block:: sh
vyos@vyos:~$ show bridge
bridge name bridge id STP enabled interfaces
br100 0000.000c29443b19 yes eth1.100
If spanning-tree is enabled, the `show bridge <name> spanning-tree` command
can be used to show STP configuration:
.. code-block:: sh
vyos@vyos:~$ show bridge br100 spanning-tree
br100
bridge id 0000.000c29443b19
designated root 0000.000c29443b19
root port 0 path cost 0
max age 20.00 bridge max age 20.00
hello time 2.00 bridge hello time 2.00
forward delay 15.00 bridge forward delay 15.00
ageing time 300.00
hello timer 0.47 tcn timer 0.00
topology change timer 0.00 gc timer 64.63
flags
eth1.100 (1)
port id 8001 state forwarding
designated root 0000.000c29443b19 path cost 4
designated bridge 0000.000c29443b19 message age timer 0.00
designated port 8001 forward delay timer 0.00
designated cost 0 hold timer 0.00
flags
The MAC address-table for a bridge can be displayed using the
`show bridge <name> macs` command:
.. code-block:: sh
vyos@vyos:~$ show bridge br100 macs
port no mac addr is local? ageing timer
1 00:0c:29:44:3b:19 yes 0.00
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