Re: [Xen-users] Problem pinging the xen guest after live migration

[John Haxby <john.haxby@xxxxxxxxxx>]

> On Sat, 2010-07-03 at 17:57 -0400, Srija G wrote:
> Hi ,
> [snip]
> Can anyone please advice , where to check?  Do you think it is the switch 
> configuration issues?
>
>    
It's almost certainly a switch issue: the switch doesn't know that the 
MAC address for the recently migrated machine is on a different port.
There are two possibilities: you can either ping something (eg the 
default router) _from_ the guest after it has migrated or you can set 
portfast on the switch.  The former just informs the switch that the 
originating MAC address is now on a different port; the latter makes the 
switch less willing to hold on to the MAC address/port association for a 
long time and is something that the network people can do.  You might 
want to try doing both.
jch



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