Hi,
I am trying to understand the GRE tunnel feature on openvswitch, and
found the following document on the networkstatic.net/. I have some
questions after the instructions that would appreciate your
clarification!
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Open vSwitch 1 configuration
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#ifconfig eth0 192.168.1.155 netmask 255.255.255.0
#ifconfig eth0 up
#ovs-vsctl add-br br1
That creates the bridge and logical BVI. Ifconfig –a will now show a
new interface named br1.
#ifconfig br1 10.1.1.1 netmask 255.255.255.0
* br1 is now the gateway for your VM DCI interface. That would
likely be one of a few connections or part of a 802.1q trunk.
#ifconfig br1 up #ovs-vsctl add-port br1 gre1 — set interface gre1
type=gre options:remote_ip=192.168.1.152
--------------------------------------------
Open vSwitch 2 configuration
--------------------------------------------
#ifconfig eth0 192.168.1.152 netmask 255.255.255.0
#ifconfig eth0 up
#ovs-vsctl add-br br1
#ifconfig br1 10.1.1.2 netmask 255.255.255.0
#ifconfig br1 up
#ovs-vsctl add-port br1 gre1 — set interface gre1 type=gre
options:remote_ip=192.168.1.152
* Now spin up your VM. I use the following to boot Ubuntu off CD
Here is my questions/confusions regarding the feature:
1) How is br1 and eth0 related? Is eth0 not part of br1? or just br1
using eth0 to tunnel the packets? When ovs is started, eth0 is already
part of br0. What is the difference between br0 and br1? br1 is a
tunnel between switches and br0 is virtual bridge for VMs on the same
switch?
2) In the example, switch 1 and switch 2's eth0 address configs are
different, but in the add-port command, the remote_ip was same, was
that a mistake? should remote_ip same as the configured eth0 ip?
Appreciate your helps! If there is a better documentation about how
the feature works and how to setup, would you please give me a
pointer?
Thanks!
Yimin
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