openstack/openstack-manuals
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Merge "Gives clearer definition of a Linux Bridge"

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Jenkins 2014-07-16 18:47:11 +00:00 committed by Gerrit Code Review
commit 91c725cd6e
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doc/admin-guide-cloud/networking/section_networking-scenarios.xml
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@ -103,10 +103,17 @@ bridge_mappings = physnet2:br-eth1</programlisting></para>
virtual network interfaces. An ethernet frame sent to one end of a veth pair
is received by the other end of a veth pair. Networking uses veth pairs as
virtual patch cables to make connections between virtual bridges.</para>
<para>A <emphasis role="italic">Linux bridge</emphasis> behaves like a hub: you can
connect multiple (physical or virtual) network interfaces devices to a Linux bridge.
Any ethernet frames that come in from one interface attached to the bridge is
transmitted to all of the other devices.</para>
<para>A <emphasis role="italic">Linux bridge</emphasis> behaves like a simple MAC
learning switch: you can connect multiple (physical or virtual) network
interfaces devices to a Linux bridge. The Linux bridge uses a MAC caching table to record
which interface on the bridge is used to communicate with a host on the link.
For any ethernet frames that come in from one interface attached to the bridge, the
host MAC address and port on which the frame was received is recorded in the MAC caching
table for a limited time. When the bridge needs to forward a frame, it will check
to see if the frame's destination MAC address is recorded in the table. If so,
the Linux bridge forwards the frame through only that port. If not, the frame
is flooded to all network ports in the bridge, with the exception of the port
where the frame was received.</para>
<para>An <emphasis role="italic">Open vSwitch bridge</emphasis> behaves like a virtual
switch: network interface devices connect to Open vSwitch bridge's ports, and the
ports can be configured much like a physical switch's ports, including VLAN