Re: [Xen-users] Network Problem after DomU migration

[shreyas pandya <pandyashreyas1@xxxxxxxxx>]

On Tuesday 31 May 2011 08:13 PM, Simon Hobson wrote:
> ml ml wrote:
>
> > i have two nodes on two switches. When i do a live migration then my
> > DomU is not reachable anymore.
> > If i start a ping manually from the DomU console, then its reachable
> > again. Looks like i need to create traffic so that the Dom0 Network
> > Stack knows that there is now a DomU running :)
> >
> > By "reachable" i mean icmp pings to that IP Address.
> More likely it's a MAC table caching issue. Each switch (and that 
> includes the virtual switch (bridge) in your Dom0) caches the MAC-port 
> mappings required to forward packets. When you move a device, then the 
> table need to update.
> Generating traffic from the DomU will generally cause the switches to 
> update their tables - though some seem to take longer than others, 
> I've seen HP switches take 5 minutes to expire the old mappings.
why are you using two switches?should not one switch suffice for two nodes?
i guess if you use one switch instead of two then the information about 
migrated vm will propagate to switches quickly
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