Olivier Blanc
2009-May-29 05:56 UTC
[Xen-devel] Xen 3.3.1 live migration : unsolicited ARP
I would like to understand the condition that makes the live migration
process to generate the unsolicited ARP REPLY, as I could never get it
to be generated !
Do you have any pointer to help me understand the process ?
Here is my network architecture :
LAN0 LAN1
| |
+-----+-----------------------------------------------------+-----+
| | | |
| eth0 eth1 |
| | | |
| +---------------+--------------------+ | |
| | | | | |
| | +---------+---------+ +--------+--------+ | |
| | | | | | | |
| | | eth0.2 | | eth0.3 | | |
| | | | | | | |
| | | vif1.0 vif1.1 | | vif2.0 vif2.1 | | |
| | | tap1.0 tap1.1 | | tap2.0 tap2.1 | | |
| | +------+-------+----+ +----+-------+----+ | |
| | | | | | | |
| | +------+-------+-----------+-------+------+ | |
| | | | | | | | | |
| | | +----+-------+----+ +----+-------+----+ | | |
| | | | | | | | | | | | | |
| | | | eth0 eth1 | | eth0 eth1 | | | |
| | | | | | | | | | | | | |
| +-+-+ | | | +-+-+ | | | +-+-+ | | | |
| | | | | | | | | | | | | | | | |
| lvs ssh | | ssh www j2ee| | ssh www j2ee| | nfs |
| | | | | | | |
| Domain0 | | Domain1 | | Domain2 | | Domain0 |
+-----------+ +-----------------+ +-----------------+ +-----------+
I am working with Xen 3.3.1. Dom0 is an OpenSuse 11.1 kernel
2.6.27.21-0.1-xen
Thanks for your advices and help
Olivier
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James Harper
2009-May-29 10:39 UTC
RE: [Xen-devel] Xen 3.3.1 live migration : unsolicited ARP
> > I would like to understand the condition that makes the livemigration> process to generate the unsolicited ARP REPLY, as I could never getit> to be generated ! > > Do you have any pointer to help me understand the process ? >Do you have STP enabled on your bridge? If enabled, it could delay the bridge port coming up for long enough that the ARP packet gets lost. James _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Olivier Blanc
2009-May-29 11:44 UTC
RE: [Xen-devel] Xen 3.3.1 live migration : unsolicited ARP
> > > > I would like to understand the condition that makes the live > migration > > process to generate the unsolicited ARP REPLY, as I could never get > it > > to be generated ! > > > > Do you have any pointer to help me understand the process ? > > > > Do you have STP enabled on your bridge? If enabled, it could delay the > bridge port coming up for long enough that the ARP packet gets lost. > > JamesNo STP is off in my bridge and forwardDelay is set to 0. And the bridge port is ready very quickly, if I set the following parameters value in the "ntable" of the bridge to reachable -> 12 delay_probe -> 20 ucast_probes -> 0 Then I lose only 2 ping transactions (less than 2 secs) to the migrated DOMU. Olivier _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel