Hi Thanks your reply. Yes, I read that manual several times before i sent the previous post here. This manual tell me that ovs-vsctl is a db client to configure Open vSwitch configuration database maintained by ovsdb-server. So when you execute ovs-vsctl add-br br01 command, it actually only store this information in Bridge table of Open vSwitch configuration database. Is my understanding right?
I also read this vlan-configuration-cookbook from http://openvswitch.org/support/config-cookbooks/vlan-configuration-cookbook/, In this configuration-cookbook, separately create two br0 in two host, by using command ovs-vsctl add-br br0, then add port eth0, tap0, tap1, after that, Ping from VM1 to VM3, this should succeed. here is my confused, how does it work? as i describe before, executing command ovs-vsctl add-br br0, it actually only store this information into Bridge table. it doesn't like executing brctl add-br br0 command, it will invoke SIOCSIFBR ioctl to kernel module. ovs-vsctl command should have the similar function in somewhere? (i can't find it), otherwise after that steps in configuration cookbook, ping between VM1 and VM3 can't success. 2013/2/7 Ben Pfaff <b...@nicira.com> > On Thu, Feb 07, 2013 at 08:40:48PM +0800, ?????? wrote: > > Recently, i am reading source code of ovs-vsctl. i get confused. what > > confused me is ovs-vsctl doesn't send instruction to kernel module, seems > > that it only store br information into br table. As we know, brctl > add-br > > will send instruction to kernel module by ioctl with flag SIOCSIFBR, and > > ovs-dpctl add-dp will send instruction to kernel module by netlink. So > my > > question is that does ovs-vsctl add-br br01 really create a bridge just > > like brctl add-br br01? If yes, please kindly tell how? Thanks. > > Here is how the ovs-vsctl manpage begins: > > The ovs-vsctl program configures ovs-vswitchd(8) by providing a > high-level interface to its configuration database. See > ovs-vswitchd.conf.db(5) for comprehensive documentation of the > database schema. > > ovs-vsctl connects to an ovsdb-server process that maintains an Open > vSwitch configuration database. Using this connection, it queries > and possibly applies changes to the database, depending on the > supplied commands. Then, if it applied any changes, by default it > waits until ovs-vswitchd has finished reconfigur- ing itself before > it exits. > > I don't understand how you could possibly interpret that as "ovs-vsctl > invokes a SIOCSIFBR ioctl". Can you explain? >
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