interfaces-bridge - Bridge extensions for the interfaces(5) file format
Linux has support for Ethernet bridging interfaces which act like an Ethernet switch within the Linux Kernel. The following options allow to set up Ethernet bridges and adding configured interfaces to bridges.
See ip-link(8) for more details about the options listed below.
bridge-ports list of interfaces
A space separated list of interfaces which should be configured as member interfaces of this bridge. This option must be set for the bridge to be configured.
bridge-hw MAC address
Denotes the MAC address the bridge should use.
bridge-ageing seconds
Denotes the time in seconds after which a MAC address will be removed from the Forwarding DataBase (FDB) after not having seen a frame with this source address.
bridge-vlan-aware bool
Denotes wether or not the bridge should be aware of 802.1q VLANs. bool can be given as yes/no or 0/1. The defaul is no. See related options for configuring vlan-aware bridges, below.
bridge-stp state
Activates or deactivates IEEE 802.1d Spanning Tree Protocol (STP) support of the bridge. Valid values are on/off.
bridge-bridgeprio priority
Sets the bridge’s priority to priority. The priority value is a number between 0 and 65535. Lower priority values are better. The bridge with the lowest priority will be elected root bridge.
bridge-fd seconds
Denotes the bridge forward delay in seconds. Valid values are between 2 and 30.
bridge-hello seconds
Denotes the bridge hello time in seconds. Valid values are between 1 and 10.
bridge-maxage seconds
Denotes the seconds until another bridge is considerd dead after reception of its last STP hello message. Valid values are between 6 and 40.
The following options only have an effect on vlan-aware bridges and their ports.
All settings can be applied on the bridge interface itself and all member port iface stanzas. If applied on the bridge interface they take effect for the bridge interface itself and might be inherited to bridge-ports depending on the compatibility settings configured in ifupdown-ng.conf(5).
Configuring VLAN options on the bridge interface might be required for setting up a VLAN interface to one of the VLANs carried within the bridge. See the EXAMPLES section for an example for this scenario.
See ifupdown-ng.conf(5) for more information about compatiblity settings mentioned below.
bridge-access vlan ID
Configure the given vlan ID for untagged ingress and egress on this interface. The common description for this kind of configuration is called "access port".
bridge-pvid vlan ID
Denotes the vlan ID to considered a PVID at ingress. Any untagged frames received on this interface will be assigned to this vlan ID. The default PVID is 1.
If compatibility to ifupdown2 bridge port inheritance is active a bridge-pvid set on the bridge will be inherited to any interface configured in bridge-ports without a bridge-pvid set.
bridge-vids list of vlan IDs
Denotes the space separated list of VLANs to be allowed tagged ingress/egress on this interface.
If compatibility to ifupdown2 bridge port inheritance is active a bridge-vids set on the bridge will be inherited to any interface configured in bridge-ports without bridge-vids set.
bridge-allow-untagged bool
Denotes wether or not the bridge should allow untagged frames on ingress as well as egress. If set to no untagged frames will be droppped on ingress and none will be sent. bool can be given as yes/no or 0/1. The defaul is yes.
A simple layer 2 only bridge:
auto br0
iface br0
|
bridge-ports eth0 veth-vm1 tap0 | ||
|
bridge-fd 0 | ||
|
bridge-stp off |
A bridge with layer 3 configuration:
auto br0
iface br0
|
bridge-ports eth0 veth-vm1 tap0 | |
|
bridge-fd 0 | |
|
bridge-stp off | |
|
# | |
|
address 192.0.2.42/24 | |
|
address 2001:db8::42/64 |
A layer 2 only vlan-aware bridge:
auto bond0
iface bond0
|
bond-members eth0 eth1 | |
|
bridge-vids 23 42 84 1337 |
auto br0
iface br0
|
bridge-ports bond0 |
A vlan-aware bridge with a VLAN interface on top:
auto eth0
iface eth0
|
bridge-vids 23 42 84 1337 |
auto br0
iface br0
|
bridge-ports eth0 | |
|
bridge-vlan-aware yes | |
|
bridge-vids 42 |
auto vlan42
iface vlan42
|
vlan-raw-device br0 | |
|
# | |
|
address 192.0.2.42/24 | |
|
address 2001:db8::42/64 |
interfaces(5) ifupdown-ng.conf(5) ip-link(8) bridge(8)
Maximilian Wilhelm <[email protected]>